Online eye care in prisons in Western Australia

Intramural Health Care Through Video Consultations and the Need for Referrals and Hospital Admissions: Retrospective Quantitative Subanalysis of an Evaluation Study

BACKGROUND

In comparison to the general population, prison inmates are at a higher risk for drug abuse and psychiatric, as well as infectious, diseases. Although intramural health care has to be equivalent to extramural services, prison inmates have less access to primary and secondary care. Furthermore, not every prison is constantly staffed with a physician. Since transportation to the nearest extramural medical facility is often resource-intensive, video consultations may offer cost-effective health care for prison inmates.

OBJECTIVE

This study aims to quantify the need for referrals to secondary care services and hospital admissions when video consultations with family physicians and psychiatrists are offered in prison.

METHODS

In 5 German prisons, a mixed methods evaluation study was conducted to assess feasibility, acceptance, and reasons for conducting video consultations with family physicians and psychiatrists. This analysis uses quantitative data from these consultations (June 2018 to February 2019) in addition to data from a sixth prison added in January 2019 focusing on referral and admission rates, as well as reasons for encounters.

RESULTS

At the initiation of the project, 2499 prisoners were detained in the 6 prisons. A total of 435 video consultations were conducted by 12 physicians (3 female and 7 male family physicians, and 2 male psychiatrists during the study period). The majority were scheduled consultations (341/435, 78%). In 68% (n=294) of all encounters, the patient was asked to consult a physician again if symptoms persisted or got worse. In 26% (n=115), a follow-up appointment with either the video consultant or prison physician was scheduled. A referral to other specialties, most often psychiatry, was necessary in 4% (n=17) of the cases. Only in 2% (n=8) of the consultations, a hospital admission was needed. Usually, hospital admissions were the result of unscheduled consultations, and the videoconferencing system was the method of communication in 88% (n=7) of these cases, while 12% (n=1) were carried out over the phone. Reasons for admissions were severe abdominal pain, hypotension, unstable angina or suspected myocardial infarction, or a suspected schizophrenic episode.

CONCLUSIONS

Most scheduled and unscheduled consultations did not require subsequent patient transport to external health care providers. Using telemedicine services allowed a prompt patient-physician encounter with the possibility to refer patients to other specialties or to admit them to a hospital if necessary.

Interventions for the detection, monitoring, and management of chronic non-communicable diseases in the prison population: an international systematic review

BACKGROUND

High rates of health inequalities and chronic non-communicable diseases exist amongst the prison population. This places people in and/or released from prison at heightened risk of multimorbidity, premature mortality, and reduced quality of life. Ensuring appropriate healthcare for people in prison to improve their health outcomes is an important aspect of social justice. This review examines the global literature on healthcare interventions to detect, monitor and manage chronic non-communicable diseases amongst the prison population and people recently released from prison.

METHODS

Systematic searches of EMBASE, MEDLINE, CINAHL, Web of Science, Scopus, and the Cochrane Library were conducted and supplemented by citation searching and review of the grey literature. The literature searches attempted to identify all articles describing any healthcare intervention for adults in prison, or released from prison in the past 1 year, to detect, monitor, or manage any chronic non-communicable illness. 19,061 articles were identified, of which 1058 articles were screened by abstract and 203 articles were reviewed by full text.

RESULTS

Sixty-five studies were included in the review, involving 18,311 participants from multiple countries. Most studies were quasi-experimental and/or low to moderate in quality. Numerous healthcare interventions were described in the literature including chronic disease screening, telemedicine, health education, integrated care systems, implementing specialist equipment and staff roles to manage chronic diseases in prisons, and providing enhanced primary care contact and/or support from community health workers for people recently released from prison. These interventions were associated with improvement in various measures of clinical and cost effectiveness, although comparison between different care models was not possible due to high levels of clinical heterogeneity.

CONCLUSIONS

It is currently unclear which interventions are most effective at monitoring and managing chronic non-communicable diseases in prison. More research is needed to determine the most effective interventions for improving chronic disease management in prisons and how these should be implemented to ensure optimal success. Future research should examine interventions for addressing multimorbidity within prisons, since most studies tested interventions for a singular non-communicable disease.

Evaluating the Efficacy of Teleophthalmology in Delivering Ophthalmic Care to Underserved Populations: A Literature Review

Technological advancement has brought commendable changes in medicine, advancing diagnosis, treatment, and interventions. Telemedicine has been adopted by various subspecialties including ophthalmology. Over the years, teleophthalmology has been implemented in various countries, and continuous progress is being made in this area. In underserved populations, due to socioeconomic factors, there is little or no access to healthcare facilities, and people are at higher risk of eye diseases and vision impairment. Transportation is the major hurdle for these people in obtaining access to eye care in the main hospitals. There is a dire need for accessible eye care for such populations, and teleophthalmology is the ray of hope for providing eye care facilities to underserved people. Numerous studies have reported the advantages of teleophthalmology for rural populations such as being cost-effective, timesaving, reliable, efficient, and satisfactory for patients. Although it is being practiced in urban populations, for rural populations, its benefits amplify. However, there are certain obstacles as well, such as the cost of equipment, lack of steady electricity and internet supply in rural areas, and the attitude of people in certain regions toward acceptance of teleophthalmology. In this review, we have discussed in detail eye health in rural populations, teleophthalmology, and its effectiveness in rural populations of different countries.

Telemedicine and delivery of ophthalmic care in rural and remote communities: Drawing from Australian experience

Rural and remote communities in Australia are characterised by small but widely dispersed populations. This has been proven to be a major hurdle in access to medical care services with screening and treatment goals repeatedly being missed. Telemedicine in ophthalmology provides the opportunity to increase the availability of high quality and timely access to healthcare within. Recent years has also seen the introduction of artificial intelligence (AI) in ophthalmology, particularly in the screening of diseases. AI will hopefully increase the number of appropriate referrals, reduce travel time for patients and ensure timely triage given the low number of qualified optometrists and ophthalmologists. Telemedicine and AI has been introduced in a number of countries and has led to tremendous benefits and advantages when compared to standard practices. This paper summarises current practices in telemedicine and AI and the future of this technology in improving patient care in the field of ophthalmology.

Electronic consultation in correctional facilities worldwide: a scoping review

OBJECTIVE

To provide an overview of the use of and evidence for eConsult in correctional facilities worldwide.

DESIGN

Scoping review.

DATA SOURCES

Three academic databases (MEDLINE, Embase and CINAHL) were searched to identify papers published between 1990 and 2020 that presented data on eConsult use in correctional facilities. The grey literature was also searched for any resources that discussed eConsult use in correctional facilities. Articles and resources were excluded if they discussed synchronous, patient-to-provider or unsecure communication. The reference lists of included articles were also hand searched.

RESULTS

Of the 226 records retrieved from the academic literature search and 595 from the grey literature search, 22 were included in the review. Most study populations included adult male offenders in a variety of correctional environments. These resources identified 13 unique eConsult services in six countries. Six of these services involved multiple medical specialties, while the remaining services were single specialty. The available evidence was organised into five identified themes: feasibility, cost-effectiveness, access to care, provider satisfaction and clinical impact.

CONCLUSIONS

This study identified evidence that the use of eConsult in correctional facilities is beneficial and avoids unnecessary transportation of offenders outside of the facilities. It is feasible, cost-effective, increases access to care, has an impact on clinical care and has high provider satisfaction. Some gaps in the literature remain, and we suggest further research on patient satisfaction, enablers and barriers to implementation, and women, youth and transgender populations in this setting to inform service providers and stakeholders. Despite some gaps, eConsult is evidently an important tool to provide timely, high-quality care to offenders.

VISION-RELATED MALPRACTICE INVOLVING PRISONERS: Analysis of the Westlaw Database

PURPOSE

To characterize vision-related malpractice litigation involving prisoners.

METHODS

Retrospective legal database review using the Westlaw database was performed to identify vision-related malpractice lawsuits involving prisoners in the United States from 1914 to 2020. Main outcomes and measurements were allegations of malpractice, verdicts, and settlements.

RESULTS

Sixty-four vision-related malpractice lawsuits involving prisoners were identified. Mean defendant age was 49 years (range, 28-74 years). Fifty-seven percent of the defendants were ophthalmologists and 43% were optometrists. The cases were most commonly from the South and Midwest (n = 19 [30%] for each). Allegations of malpractice included inadequate medical care or treatment refusal (n = 21 [33%]), failure to treat fully leading to continued suffering (n = 18 [28%]), and delay in treatment or referral (n = 17 [27%]). Retina-related diagnoses were most common (n = 18 [28%]). Forty-six (72%) cases were closed, 14 (22%) were open, and four (6.3%) were partially closed. Only two (3.1%) cases were decided in favor of the plaintiff. The most common reason for an unsuccessful suit was lack of deliberate indifference by the eye care professional (n = 21 [46%]).

CONCLUSION

The most common reasons for vision-related malpractice brought forth by prisoners were inadequate or incomplete eye care and treatment refusal. Retina was the most commonly involved subspecialty. However, the success rate of these suits was extremely low.

A Systematic Review of Current Teleophthalmology Services in New Zealand Compared to the Four Comparable Countries of the United Kingdom, Australia, United States of America (USA) and Canada

Background

Over 700,000 New Zealanders (NZ), particularly elderly and Māori, live without timely access to specialist ophthalmology services. Teleophthalmology is a widely recognised tool that can assist in overcoming resource and distance barriers. Teleophthalmology gained unprecedented traction in NZ during the COVID-19 pandemic and subsequent lockdown. However, its provision is still limited and there are equity issues. The aim of this study was to conduct a systematic review identifying, describing and contrasting teleophthalmology services in NZ with the comparable countries of Australia, USA, Canada and the United Kingdom.

Methods

The electronic databases Embase, PubMed, Web of Science, Google Scholar and Google were systemically searched using the keywords: telemedicine, ophthalmology, tele-ophthalmology/teleophthalmology. The searches were filtered to the countries above, with no time constraints. An integrative approach was used to synthesise findings.

Results

One hundred and thirty-two studies were identified describing 90 discrete teleophthalmology services. Articles spanned from 1997 to 2020. Models were categorised into general eye care (n=21; 16%); emergency/trauma (n=6; 4.5%); school screening (n=25; 19%); artificial intelligence (AI) (n=23; 18%); and disease-specific models of care (MOC) (n=57; 43%). The most common diseases addressed were diabetic retinopathy (n=23; 17%); retinopathy of prematurity (n=9; 7%); and glaucoma (n=8; 6%). Programs were mainly centred in the US (n=72; 54.5%), followed by the UK (n=29; 22%), then Canada (n=16; 12%), Australia (n=13; 10%), with the fewest identified in NZ (n=3; 2%). Models generally involved an ophthalmologist consultative service, remote supervision and triaging. Most models involved local clinicians transmitting fed-forward or live images.

Conclusion

Teleophthalmology will likely play a crucial role in the future of eye care. COVID-19 has offered a unique opportunity to observe the use of teleophthalmology services globally. Feed-forward and, increasingly, live-based teleophthalmology services have demonstrated feasibility and cost-effectiveness in similar countries internationally. New Zealand’s teleophthalmology services, however, are currently limited. Investing in strategic partnerships and technology at a national level can advance health equities in ophthalmic care.

The impacts of and outcomes from telehealth delivered in prisons: A systematic review

BACKGROUND

While the delivery of healthcare services within prison systems is underpinned by different models, access to timely and optimal healthcare is often constrained by multifaceted factors. Telehealth has been used as an alternative approach to conventional care. To date, much of the focus has been on evaluation of telehealth interventions within certain geographical contexts such as rural and remote communities. Therefore, the aim of this systematic review was to synthesise the evidence base to date for the impacts of, and outcomes from, telehealth delivered in prisons.

METHODS

This systematic review was underpinned by best practice in the conduct and reporting of systematic reviews. A systematic search was conducted to reinforce the literature selection process. The modified McMaster Critical Appraisal Tool was used to assess the methodological quality of the included studies. A narrative synthesis of the study outcomes was undertaken.

RESULTS

Twenty-nine quantitative studies were included. Telehealth interventions were greatly varied in terms of types of healthcare services, implementation process and intervention parameters. Methodological concerns such as rigour in data collection and analysis, and psychometric properties of outcome measures were commonly identified. Process-related outcomes and telehealth outcomes were the two overarching categories identified.

CONCLUSION

This systematic review provides mixed evidence on the impact of, and outcomes from, telehealth in prisons. While the evidence base does highlight some positive impacts of telehealth, which at the least, is as effective as conventional care while achieving patient satisfaction, it is also important to consider the local context and drivers that may influence what, when and how telehealth services are provided. Addressing critical factors throughout the lifecycle of telehealth is equally important for successful implementation and sustainability.

Telemedicine in the correctional setting: A scoping review

Introduction

The access healthcare services to inmates within correctional settings has generally been low and problematic due to specific nature of the prison setting. Telemedicine has been used as an alternative delivery mode. This study aimed to collate the current evidence related to the use of telemedicine to deliver health services within correctional settings.

Methods

A comprehensive search of seven databases – PubMed, Embase, CINAHL, Informit, Cochrane Central Register of Controlled Trials, PsycINFO and Scopus, for peer-reviewed publications was conducted in April, 2018.

Results

Initial search identified 1147 articles. After review of the title and abstract, 36 articles were included in the final review. Of the included articles, 19 (53%) were published during the period of 2010-2018. Articles were predominantly from the USA ( n = 23; 64 %), France and Australia. There were 23 descriptive studies (64%), five costing studies (14%) five experimental studies (14%), two mixed methods (6%) and one qualitative study (3%). The experimental studies were predominantly focused on mental health services ( n = 4, 80%). The commonest telemedicine intervention used was synchronous videoconferencing ( n = 21, 58%), while eight articles (22%) described asynchronous interventions. Telemedicine interventions were mainly used for mental health ( n = 13), and ophthalmology ( n = 4) disciplines.

Discussion

In the right circumstances, telemedicine interventions within correctional settings seem to be a useful method in connecting inmates with essential health services.

Development of a store-and-forward telescreening system of diabetic retinopathy: lessons learned from Iran

Background

The present study describes the development and identity phases of a teleophthalmology system used for screening of diabetic retinopathy.

Methods

A questionnaire was used to identify the main factors necessary for diagnosis of diabetic retinopathy and the features required for a teleophthalmology system. In the second phase, a web-based prototype of the system was designed using the data collected in the previous phase. In the final phase, the system was optimized based on the users’ ideas and comments; then, it was evaluated through a standard usability testing questionnaire.

Results

The results showed that the lowest average percentages were related to ethnicity (61%), optometrist’s office address (61%), and consultant physician’s office address (65%). A web-based prototype was designed using the Visual Studio and Dreamweaver programming tools. This system comprised patient identity data, medical history, clinical data, and retinal images of the patient. The mean score of usability testing and user satisfaction including specialists, residents, and optometrist was 7.3, 7.1 and 7.3 (out of a total 9), respectively. The evaluation results revealed that the system was classified as good.

Conclusion

The telescreening system suggested in the current study could be helpful in timely diagnosis. Moreover, it would reduce the treatment costs and complexities. Regardless of the positive points of telemedicine systems, one of the most challenges in this study was the Internet infrastructure to design and apply the system. The future studies, therefore, could focus on the application of cell phone technology for rendering teleophthalmology.

Economic modelling of telehealth substitution of face-to-face specialist outpatient consultations for Queensland correctional facilities

Objective The provision of healthcare services to inmates in correctional facilities is costly and resource-intensive. This study aimed to estimate the costs of transporting prisoners from 11 Queensland correctional facilities to the Princess Alexandra Hospital Secure Unit (PAHSU) in Brisbane for non-urgent specialist outpatient consultations and identify the cost consequences that would result from the substitution of face-to-face visits with telehealth consultations. Methods A 12-month retrospective review of patient activity at the PAHSU was conducted to obtain the number of transfers per correctional facility. The total cost of transfers was calculated with estimates for transport vehicle costs and correctional staff escort wages, per diem and accommodation costs. A cost model was developed to estimate the potential cost savings from substituting face-to-face consultations with telehealth consultations. A sensitivity analysis on the cost variables was conducted. Costs are reported from a government funding perspective and presented in 2016 Australian dollars (A$). Results There were 3539 inmate appointments from July 2015 to June 2016 at the PAHSU, primarily for imaging, general practice, and orthopaedics. Telehealth may result in cost savings from negligible to A$969 731, depending on the proportion, and travel distance, of face-to-face consultations substituted by telehealth. Wages of correctional staff were found to be the most sensitive variable. Conclusions Under the modelled conditions, telehealth may reduce the cost of providing specialist outpatient consultations to prisoners in Queensland correctional facilities. Telehealth may improve the timeliness of services to a traditionally underserved population. What is known about the topic? Specialist medical services are located in only a few metropolitan centres across Australia, which requires some populations to travel long distances to attend appointments. Some face-to-face specialist outpatient consultations can be substituted by telehealth. What does this paper add? Prisoners from correctional facilities represent one specific population that requires complex travel arrangements for specialist medical appointments. Transportation of prisoners for specialist health appointments represents a substantial cost to the government. This paper quantifies the annual cost in Queensland for transporting prisoners, taking into account fuel and vehicle costs, staff wages, per diem rates, and accommodation. In addition, it quantifies the costs of substituting face-to-face consultations with telehealth consultations. What are the implications for practitioners? This research encourages practitioners to consider using telehealth services for prisoners, as well providing an argument for tertiary centres to include telehealth as a model of care for this population. Telehealth can result in major cost savings and state and federal governments should consider implementation especially in Australia where correctional facilities and specialist services are separated by great geographic distances.

Models of care in tele-ophthalmology: A scoping review

The objective of this review was to identify and describe telehealth models of care for ophthalmic services. We conducted a scoping review of the literature to identify how ophthalmic care can be delivered by telehealth. We searched the PubMed database to identify relevant articles which were screened based on pre-defined inclusion criteria. For included articles, data were extracted, categorised and analysed. Synthesis of findings was performed narratively. The scoping review included 78 articles describing 62 discrete tele-ophthalmic models of care. Tele-ophthalmic models of care can be used for consultative service, screening, triage and remote supervision. The majority of services were for general eye care and triage ( n = 17; 26%) or emergency services ( n = 8; 12%). The most common conditions for disease-specific models of care were diabetic retinopathy ( n = 14; 21%), and glaucoma ( n = 8; 12%). Most models of care involved local clinicians capturing images and transmitting them to an ophthalmologist for assessment. This scoping review demonstrated tele-ophthalmology to be feasible for consultation, screening, triage and remote supervision applications across a broad range of ophthalmic conditions. A large number of models of care have been identified and described in this review. Considerable collaboration between patient-end clinicians and substantial infrastructure is typically required for tele-ophthalmology.

Teleophthalmic Approach for Detection of Corneal Diseases: Accuracy and Reliability

PURPOSE

Corneal and anterior segment diseases cause most of the urgent visits to eye care professionals. We evaluated the diagnostic accuracy of detecting corneal diseases using external photographs from 2 portable cameras for telemedicine purposes.

METHODS

This is a prospective study of adults with a clinical diagnosis of corneal pathology including corneal abrasions, ulcers, scars, and pterygia. A cornea specialist provided the gold standard diagnosis by slit-lamp examination. Images of both eyes were obtained using iTouch 5S and Nidek VersaCam cameras in multiple gazes and interpreted by 3 cornea specialists for the presence of pathology. Accuracy to detect disease was compared with gold standard diagnosis, stratified by the camera and grader. Reliability was evaluated with weighted kappa statistics. Graders assessed image quality on a Likert scale from 1 (poor) to 9 (optimal).

RESULTS

A total of 198 eyes (110 subjects) were photographed. By gold standard diagnosis, 59 eyes (30%) had corneal scars, 34 (17%) had ulcers, 13 (7%) had abrasions, 10 (5%) had pterygia, and 82 (41%) were normal. Sensitivity to detect AS pathology ranged from 54% to 71% for the iTouch and 66% to 75% for the Nidek, across graders; specificity ranged from 82% to 96% for the iTouch and 91% to 98% for the Nidek. The intergrader reliability was moderate to strong (kappa ranges: 0.54-0.71 for the iTouch; 0.75-0.76 for the Nidek). Quality ratings were variable between graders.

CONCLUSIONS

External photographs taken by standard, nonenhanced portable cameras and interpreted remotely by ophthalmologist graders yielded sensitivity values that are not yet suitable for telemedicine applications. Additional work is needed to improve the ability to detect AS pathology remotely.

Diabetic screening in Western Australia: A photographer’s perspective

Western Australia has a large landmass and low population density. Dating back to the 1970s and even today, specialist medical services are often lacking or non-existent outside of Perth, the capital city. Diabetes has always been a major health problem, particularly in the Australian Aboriginal community. In conjunction with the Lions Save Sight Foundation and Diabetes Foundation of Western Australia a diabetic screening programme was initiated in 1978 for rural and remote diabetics. The programme aimed to screen for diabetic retinopathy, educate diabetics, medical and paramedical personnel and to arrange treatment for sight threatening eye disease. Eye screening continues to date although the role of the Lions Eye Institute has changed from programme initiator to reading centre and teaching unit, and continues to evolve with changing technologies.

Timeliness and access to healthcare services via telemedicine for adolescents in state correctional facilities

PURPOSE

The aim of this study was to examine the effectiveness of a telemedicine program in improving timeliness of and access to healthcare services in adolescent correctional facilities.

METHOD

This study is a pre/post quasi-experimental design comparing time to treatment and healthcare use in the year preceding and the 2 years after the implementation of a telemedicine program in four facilities housing adolescents from 12 to 19. Timeliness of care is measured by time from referral to date of service (for behavioral healthcare only). Access to care is measured by use of outpatient care, emergency department (ED) visits, and inpatient visits.

RESULTS

Two of the four state correctional facilities had a significant decrease (24%) in time from referral to treatment after the implementation of the telemedicine intervention. The facilities not showing significant improvements in timeliness experienced difficulty implementing the telemedicine program. The telemedicine program was also associated with significant improvements in access to care. Outpatient visits increased by 40% in the 2 years after implementation of telemedicine. For each 1% increase in telemedicine usage, outpatient visits increased by 1%, whereas emergency room visits decreased by 7%.

CONCLUSIONS

Telemedicine can have a positive impact on timeliness of and access to care for youth in correctional facilities.

Use of real-time telemedicine in the detection of diabetic macular oedema: a pilot study

PURPOSE

The high prevalence of diabetic retinopathy (21-36%) and 2 yearly reviews recommended by the National Health and Medical Research Council for diabetics with no retinopathy creates a considerable burden for review in rural and regional Australia. Screening for diabetic retinopathy using telemedicine has significant implications. If effective, such a tool would have an impact on finance and resource allocation. The purpose of the study was to establish if telemedicine could distinguish clinically significant macular oedema (CSME) from eyes free of this form of disease.

METHODS

A study population with representative examples of normal fundi and the different grades of retinopathy was chosen from existing records. The specificity and sensitivity of telemedicine diagnosis was compared with fundus photography and examination by an experienced ophthalmologist as a 'gold standard', in a blinded manner. Real-time telemedicine assessment was performed with live video and audio connections with the transmitting and receiving units set in different areas of the ophthalmology department. The transmission end consisted of a video camera mounted on a slit lamp and the receiving unit consisted of a 21'' LCD monitor. A video conference link was established using three ISDN lines capable of 128 kb per second transfer per line allowing for a total of 348 kb per second when utilizing all three lines for high resolution images. Fundus photographs were taken with a Zeiss FF 450 Plus Digital imaging system.

RESULTS

For telemedicine, sensitivity was 38% (95% CI, 35-40%) and specificity was 95% (95% CI, 91-99%). For photography, sensitivity was 75% (95% CI, 71-79%) and specificity was 95% (95% CI, 91-99%).

CONCLUSIONS

In this pilot study, sensitivity of detection of CSME by photography was considerably better than for live-link telemedicine. This study tends to confirm the continued superiority of examination of the patient by an experienced ophthalmologist as the best method of screening for CSME, a sight threatening form of diabetic retinopathy.

Retinal image analysis: concepts, applications and potential

As digital imaging and computing power increasingly develop, so too does the potential to use these technologies in ophthalmology. Image processing, analysis and computer vision techniques are increasing in prominence in all fields of medical science, and are especially pertinent to modern ophthalmology, as it is heavily dependent on visually oriented signs. The retinal microvasculature is unique in that it is the only part of the human circulation that can be directly visualised non-invasively in vivo, readily photographed and subject to digital image analysis. Exciting developments in image processing relevant to ophthalmology over the past 15 years includes the progress being made towards developing automated diagnostic systems for conditions, such as diabetic retinopathy, age-related macular degeneration and retinopathy of prematurity. These diagnostic systems offer the potential to be used in large-scale screening programs, with the potential for significant resource savings, as well as being free from observer bias and fatigue. In addition, quantitative measurements of retinal vascular topography using digital image analysis from retinal photography have been used as research tools to better understand the relationship between the retinal microvasculature and cardiovascular disease. Furthermore, advances in electronic media transmission increase the relevance of using image processing in 'teleophthalmology' as an aid in clinical decision-making, with particular relevance to large rural-based communities. In this review, we outline the principles upon which retinal digital image analysis is based. We discuss current techniques used to automatically detect landmark features of the fundus, such as the optic disc, fovea and blood vessels. We review the use of image analysis in the automated diagnosis of pathology (with particular reference to diabetic retinopathy). We also review its role in defining and performing quantitative measurements of vascular topography, how these entities are based on 'optimisation' principles and how they have helped to describe the relationship between systemic cardiovascular disease and retinal vascular changes. We also review the potential future use of fundal image analysis in telemedicine.