Extended depth-of-focus intraocular lenses: power calculation and outcomes

Prophylactic Therapy for Long-Term Ocular Discomfort After Cataract Surgery

PURPOSE

The cataract surgery dissatisfaction rate is 20% to 35% due to ocular surface discomfort. We investigate the ocular surface discomfort after surgical failure as a consequence of age-related parainflammation. We also aim to prevent it by immune-modulating prophylactic management.

METHODS

Monocentric clinical trial realized in a teaching hospital. Prospective, randomized, open-label, unmasked clinical trial. One hundred patients diagnosed with cataracts underwent phacoemulsification surgery. Groups A (<65 years; n = 25) and B (>75 years; n = 25) received surgery only. Groups C and D (both >75 years and both n = 25) used cyclosporine A 0.1% cationic emulsion (CE) eye drops or CE lubricating eye drops (both twice daily), respectively, for 30 days before surgery. Patients were followed up 90 days after surgery. The primary outcome was postoperative ocular surface failure; secondary outcomes examined the influence of prophylactic cyclosporine A 0.1% CE therapy on ocular surface outcomes.

RESULTS

Group B demonstrated greater severity regarding ocular surface signs and symptoms throughout the study period, versus all other groups. Signs/symptoms were typically lower in Group A. Group C achieved significant reductions in conjunctival Symptom Assessment in Dry Eye values ( P < 0.05), conjunctival hyperemia severity ( P < 0.01), and meibomian gland dysfunction ( P < 0.001) at Day 45, versus Group B, and tear break-up time was increased ( P < 0.001). Ocular surface inflammatory marker transcription (HLADR, intercellular adhesion molecule 1 [ICAM-1], and interleukin 6 [IL-6]) was significantly downregulated in Group C, versus Group B, at 90 days ( P < 0.05).

CONCLUSIONS

Cataract surgery induced ocular surface system failure with a clinically significant persistent inflammatory status (InflammAging) in patients older than 75 years. Prophylactic cyclosporine A 0.1% CE eye drops were associated with improved ocular surface homeostasis and reductions in inflammatory markers.

Zonular dialysis and cataract surgery: results from a UK tertiary eye care referral centre

OBJECTIVE

Zonular dialysis (ZD), referred to as the presence of a deficient zonular support for the lenticular capsule, might be the result of several causes and be detected only at the time of cataract surgery. The aim of this study was to evaluate pre-, intra-, and postoperative features of eyes with ZD regardless of the etiology detected during cataract surgery.

METHODS

A single-centre retrospective observational cohort study was performed at Moorfields Eye Hospital (NHS Foundation Trust, London, U.K.) to identify patients who underwent cataract surgery whose procedure was intraoperatively described as being complicated by ZD between January 1, 2014, and August 22, 2019. Patient characteristics, intraoperative clinical findings, visual and refractive outcomes, and postoperative complications were recorded.

RESULTS

ZD was identified intraoperatively in 447 eyes. In most cases (213 of 223; 96.8%), patients underwent a phacoemulsification procedure, not requiring any conversion to intracapsular or extracapsular extraction technique. Intraoperative complications increased to 46.2% (103 of 223), with no significant correlation with ZD width. Capsular tension rings (CTRs) were implanted in 43.4% of patients (97 of 223). The use of CTRs correlated with better postoperative visual and refractive outcomes.

CONCLUSIONS

ZD is a serious complication of cataract surgery requiring prompt intraoperative diagnosis and proper management. While it tends to worsen cataract surgery outcomes, the implantation of CTRs during the surgical procedure seems to be associated with better postoperative visual and refractive results.

Immediate sequential vs delayed sequential bilateral cataract surgery: systematic review and meta-analysis

The main aim of this systematic review and meta-analysis was to evaluate the safety and efficacy profile of immediate sequential bilateral cataract surgery (ISBCS) compared with delayed sequential bilateral cataract surgery (DSBCS). MEDLINE Ovid, EMBASE, and CENTRAL databases were searched. Outcome measures were postoperative visual acuity, postoperative spherical equivalent (refractive outcome), endophthalmitis, corneal edema, pseudophakic macular edema, and posterior capsule rupture (PCR). 13 articles met criteria for final inclusion. A total of 11 068 622 participants (18 802 043 eyes) were included. No statistically significant differences between ISBCS and DSBCS were identified in all the postoperative outcomes evaluated. However, a higher risk for PCR was identified in the ISBCS group from the pooled analysis of nonrandomized studies (risk ratio, 1.34, 95% CI, 1.08-1.67, P = .0081). In our view, the ISBCS approach has an acceptable safety-efficacy profile, comparable with DSBCS. Future investigations are warranted, with a focus on the analysis of risk factors for surgical complications, patient-reported outcome-measures, and cost effectiveness.

Depth of focus of four novel extended range of vision intraocular lenses

PURPOSE

To assess the depth of focus of four latest non-diffractive extended range of vision IOLs on the optical bench. Such comparison had not been done before.

METHODS

We assessed and compared the through focus modulation transfer function (MTF) of the following novel IOLs with a nominal power of 22 D: Acrysof Vivity, LuxSmart Crystal, RayOne EMV and Tecnis Eyhance. An ISO-2 model eye was applied with apertures of 3 and 4.5 mm with monochromatic light of 546 nm. Measurements were done on OptiSpheric IOL PRO 2 optical bench.

RESULTS

For the aperture of 3 mm, Eyhance and RayOne EMV showed the most pronounced peak in MTF with only little enlarged depth of power. Vivity and LuxSmart showed two peaks of about 1.7 D respectively 1.3 D depth of focus, yet reduced MTF and with maxima differently located. For 4.5 mm, MTF values for Eyhance and particularly for RayOne EMV dropped. For Vivity and LuxSmart, only the peak for the secondary focus decreased.

CONCLUSION

Vivity and LuxSmart showed a larger depth of focus for our measuring conditions than Eyhance and RayOne EMV. Correspondingly, the peak MTF was best for Eyhance and RayOne ERV with small aperture. With the larger aperture, RayOne EMV considerably lost performance.

Latest Development in Extended Depth-of-Focus Intraocular Lenses: An Update

In recent years, there has been an overwhelming influx of different types of intraocular lenses (IOLs) as treatment for presbyopia. The extended depth-of-focus (EDOF) technology creates a single elongated focal point to enhance depth of focus, in contrast to the multiple foci of multifocal (MF) lenses. In this way, the EDOF lenses aim to reduce photic phenomena, glare, and halos, which have been reported in MF IOLs. A potential disadvantage of this is a blur due to decreased retinal image quality when the amount of the aberrations is increased excessively. Multifocality and EDOF characteristics are not exclusive of each other. Frequently, EDOF IOLs are combined with MF optical designs, a bifocal IOL may exhibit EDOF characteristics, likewise an aspheric monofocal IOL or a diffractive or refractive trifocal IOL. Thus, EDOF lenses are commonly subjected to confusion. A wide range of different types of EDOF lenses are available on the market to surgeons. In this practical update, we aim to clarify what is a true EDOF lens, classify the different types of the EDOF lenses based on their optical principle and review their recently reported outcomes. Comprehensive patient examination and selection, combined with knowledge of the most updated options and adequate patient counseling, can avoid dissatisfaction and yield the desired outcomes.

Intolerance of a non-diffractive extended-depth-of-focus IOL with mini-monovision

Purpose

The use of a non-diffractive extended-depth-of-focus (EDOF) intraocular lens (IOL) with slight myopia of -0.5 D on the non-dominant eye increases the spectacle independence and has good subjective tolerance with optical phenomena comparable to those of a monofocal IOL. This case report describes the course of a myopic patient who underwent refractive lens exchange, didn't tolerate mini-monovision and received IOL exchange therefore.

Observations

A healthy, 62-year-old male with myopia of approximately -5 D underwent refractive lens exchange with a non-diffractive EDOF-IOL on both eyes with slight myopia on the non-dominant left eye (mini-monovision). The operation was performed without any complications, postoperative treatment was due to the clinic's standard procedure. Two weeks postoperative the patient presented with uncorrected distance visual acuity of 0.0 logMAR, a subjective refraction of -0.25/-0.25/142° and corrected distance visual acuity of 0.1 logMAR on the right eye. On the left eye, distance visual acuity was 0.4 logMAR with a subjective refraction of -0.5/-0.75/9° (intended mini-monovision) and corrected distance visual acuity of 0.0 logMAR. Binocular distance visual acuity was 0.0 logMAR. The patient complained about the occurrence of optical phenomena at dim light while driving a car and subjective reduced visual acuity. After an IOL exchange on the left eye with the implantation of the same type of non-diffractive EDOF-IOL aimed for emmetropia, the patient was symptom-free and reported no more subjective complaints.

Conclusions

Despite the satisfying subjective and objective visual outcome which is proven in multiple studies, the subjective perception of a mini-monovision with a non-diffractive EDOF-IOL can vary individually. A preoperative assessment of the patient's needs and tolerance of a mini-monovision is crucial for a satisfying postoperative outcome.

Visual function assessment of Chinese cataract patients after individual aspheric intraocular lens implantation according to preoperative cornea spherical aberration

BACKGROUND: Aspheric intraocular lens (IOLs) implantation has been widely applied in cataract surgery. However, there is no consensus on the optimal guidance for the operations in IOLs implantation. OBJECTIVE: This study evaluated the visual function of Chinese cataract patients six months after cataract surgery with two different guiding ideologies. METHODS: We evaluated 50 patients (61 eyes) with implantation of different aspheric IOLs (SN60WF IOLs, ZCB00 IOLs, PY-60AD IOLs, AO IOLs) 6 months after cataract surgery. Twenty-four patients (30 eyes) under individual implantation were ascribed to group 1 and 26 patients (31 eyes) with randomized implantation were ascribed to the control group (group 2). Postoperatively parameters included monocular best-corrected visual acuity (BCVA), contrast sensitivity (CS), total spherical aberration Z (4, 0) at 5 mm pupil size, and patient satisfaction. The quality of life after operation was assessed through the National Eye Institute Visual Function Questionnaire-25 (NEI VFQ-25). RESULTS: Six months after cataract operation, the contrast sensitivity with glare of group 1 at 2.5∘ was 0.697 ± 0.027, and 0.532 ± 0.049 in group 2. Besides, there was no significant difference at any other special frequency. The mean spherical aberration Z (4, 0) at 5 mm pupil size in group 1 was 0.015 ± 0.028 um, and in group 2 was 0.043 ± 0.109 um, with a significant difference (p< 0.01). The mean scores obtained from NEI VFQ-25 were not significantly different. CONCLUSION: It is effective to implant aspheric IOLs individually according to preoperative corneal spherical aberration. Patients obtained better contrast sensitivity with glare at 2.5∘, but there was no significant difference in BCVA, contrast sensitivity at other special frequency, and subjective visual function.

Effect of decentration and tilt on four novel extended range of vision intraocular lenses regarding far distance

PURPOSE

To analyze the effect of decentration and tilt on four novel non diffractive extended range of vision intraocular lenses (IOLs).

METHODS

Acrysof Vivity, LuxSmart Crystal, RayOne EMV and Tecnis Eyhance were compared on the optical bench (power of 22 D each). Modulation transfer functions were obtained and Strehl ratio was calculated in an ISO-2 model. Apertures of 3 mm and 4.5 mm were applied. For qualitative assessment, United States Airforce (USAF) chart images were evaluated. Additional to centered IOLs, tilt of 5 degrees and decentration of 1 mm were applied.

RESULTS

RayOne EMV was very robust against misalignment but had considerable deterioration of modulation transfer function (MTF) for large aperture with USAF images seriously blurred. Tilt and decentration decreased the performance of Eyhance significantly but had minor impact on the performance of Vivity and LuxSmart. For 4.5 mm aperture, MTF and Strehl ratio decreased markedly for all IOLs compared to 3 mm aperture size. The best MTF and Strehl ratio was obtained for Eyhance IOL well centered for both sizes of aperture.

CONCLUSION

Tilt and decentration had a major impact on the performance of Eyhance only, which performed best of all IOLs tested when well centered. With large aperture, performance of all IOLs significantly decreased. Manufacturer's different approaches for these novel IOLs to increase depth of focus by increasing spherical aberration lead to a different performance in respect to contrast function and sensitivity to misalignment. Our results apply to the distance vision. Near vision performance will be evaluated in a separate investigation.

Clinical Outcomes, Contrast Sensitivity, Reading Performance and Patient Satisfaction Following Bilateral Implantation of AT LARA 829MP EDoF IOLs

Purpose

To evaluate the visual outcomes, contrast sensitivity, reading performance and patient satisfaction after bilateral implantation of AT LARA extended depth of focus (EDoF) intraocular lenses (IOLs).

Methods

Patients undergoing phacoemulsification for age-related cataract and satisfying the eligibility criteria underwent bilateral implantation with AT LARA EDoF IOLs (Carl Zeiss Meditec, Jena, Germany). At follow-up visits of 1, 3, 6 and 12 months, binocular uncorrected and corrected distance, intermediate and near visual acuity, reading performance, defocus curve, contrast sensitivity and patient satisfaction for dysphotopsia and spectacle independence were evaluated.

Results

A total of 60 eyes from 30 patients with a mean age of 65.40±7.71 years were included in the study. At 12 months, 83% of patients (n=25) had binocular cumulative uncorrected distance visual acuity (UDVA) of 20/20 or better. Postoperative spherical equivalent refraction accuracy was within ±0.50 D for 95% of eyes (n=57) and refractive cylinder accuracy was within ≤0.50 D in 95% of eyes (n=57). The mean binocular uncorrected near visual acuity (UNVA) was 0.16±0.09 logMAR, and the mean uncorrected intermediate visual acuity (UIVA) at 60 and 80 cm was 0.01±0.09 and 0.03±0.08 logMAR, respectively, at 12 months. Reading speeds at 40, 60 and 80 cm showed improvement over time. No patient had complaints of severe dysphotopsia and none of the patients required glasses for any activity. No eye underwent YAG-laser capsulotomy for significant posterior capsule opacification at the end of mean follow-up.

Conclusion

In our limited experience of 30 patients at 12 months, AT LARA EDoF IOLs resulted in excellent visual outcomes for uncorrected distance, intermediate and near visual acuity. The incidence of dysphotopsia and spectacle dependence was low, resulting in good patient satisfaction.

Trial Registry

CTRI/2020/08/027105 (www.ctri.nic.in).

Artificial intelligence applications and cataract management: A systematic review

Artificial intelligence (AI)-based applications exhibit the potential to improve the quality and efficiency of patient care in different fields, including cataract management. A systematic review of the different applications of AI-based software on all aspects of a cataract patient's management, from diagnosis to follow-up, was carried out in accordance with the Preferred Reporting Items for Systematic Reviews and Meta-Analyses guidelines. All selected articles were analyzed to assess the level of evidence according to the Oxford Centre for Evidence-Based Medicine 2011 guidelines, and the quality of evidence according to the Grading of Recommendations Assessment, Development and Evaluation system. Of the articles analyzed, 49 met the inclusion criteria. No data synthesis was possible for the heterogeneity of available data and the design of the available studies. The AI-driven diagnosis seemed to be comparable and, in selected cases, to even exceed the accuracy of experienced clinicians in classifying disease, supporting the operating room scheduling, and intraoperative and postoperative management of complications. Considering the heterogeneity of data analyzed, however, further randomized controlled trials to assess the efficacy and safety of AI application in the management of cataract should be highly warranted.

Visual and patient-reported factors leading to satisfaction after implantation of diffractive EDOF and trifocal intraocular lenses

PURPOSE

To evaluate factors that influence postoperative satisfaction in patients with diffractive EDOF and multifocal IOLs.

SETTING

Department of Ophthalmology, Goethe University Frankfurt, Germany.

DESIGN

Observational case study.

METHODS

Patients were evaluated after implantation of a diffractive EDOF (Symfony, J&J, USA; AT LARA, CZM, Germany) or tri-/quadrifocal (AT LISAtri, CZM, Germany; Panoptix, Alcon, USA) 3 months postoperatively. A subjective refraction was performed, uncorrected and corrected visual acuity was tested for distance (UDVA, CDVA), intermediate (at 60 & 80cm, UIVA, DCIVA), and near (at 40cm, UNVA, DCNVA). A test for contrast sensitivity was done and the patients filled out two different questionnaires on daily activities and optical phenomena. Parameters with a potential correlation to the postoperative overall satisfaction were investigated.

RESULTS

We included 94 patients with a mean age of 66 years ± 19. Patients with a better UDVA and UIVA at 60cm were more likely to choose the same IOL again. The intensity of subjective optical phenomena and the visual quality at different tasks of daily living influenced the overall satisfaction. UIVA at 80cm, UNVA, and corrected VA demonstrated no significant influence on patient satisfaction. The uncorrected visual acuity at specific distances had a direct impact on the subjective visual quality regarding the task performed at those distances.

CONCLUSION

For patients with diffractive EDOF and multifocal IOLs, the UDVA and UIVA at 60cm seem to be more important than the UNVA and UIVA at 80cm. Subjective visual quality and optical phenomena influence patient satisfaction, as well.

Analysis of higher order aberrations in recently developed wavefront-shaped IOLs

PURPOSE

A new class of enhanced range of vision intraocular lenses (IOLs) has been introduced recently to cope with compromises of diffractive optics in patients aiming for spectacle independence. Few information is available about their optical function. We aimed to analyze higher order aberrations of four of these new wavefront-shaped IOLs under standardized conditions.

METHODS

Two recently developed enhanced monofocal and two recently developed enhanced depth of focus IOLs (power 22 D) were analyzed by a Shack-Hartmann sensor in an in-situ model eye according to ISO 11,979 in NaCl with 546 nm. We determined the Zernike polynomials up to the 10th order.

RESULTS

Only spherical aberration (SA) of different orders was considerably modified. Whereas RaySof EMV showed a moderate increase in Z 4-0, Eyhance and Vivity produced a considerable increase of negative Z 4-0. A combination of Z 4-0 and Z 6-0 with an opposite sign was found in LuxSmart.

CONCLUSION

SAs of different orders are the only relevant Zernike polynomials in this new class of wavefront-shaped IOLs. RaySof EMV proved to be a monofocal IOL with increased positive SA. The central change in radial power and the resulting increase in negative SA in Eyhance IOL might produce some depth of field. The magnitude of SA modification of Vivity and LuxSmart is expected to extend the depth of focus considerably. Surgeons can select among these novel IOLs depending on corneal asphericity and the patient's wish for spectacle independence.

Extended depth-of-focus (EDOF) AcrySof® IQ Vivity® intraocular lens implant: a real-life experience

PURPOSE

Extended depth-of-focus (EDOF) is a promising intraocular lens (IOL) technology for cataract surgery. The aim of the study was to report the real-life experience related to the implant of EDOF AcrySof® IQ Vivity® (Alcon Inc., USA) IOL.

METHODS

The study was designed as a interventional, prospective, case series with 3 months of follow-up. Patients needing cataract surgery, without any other kind of ocular diseases, were recruited and implanted with AcrySof® IQ Vivity® IOL. We evaluated the refractive success of this IOL through complete ophthalmologic assessments and the administration of the Quality of Vision test. The main outcome measures were the refractive outcome; far, intermediate, and near vision; and Quality of Vision score.

RESULTS

We included 108 eyes (54 patients; age 62 ± 5 years). Intra-operative and post-operative complications were 0%. Thirty out of 100 eyes (28%) required toric IOL. Best-corrected visual acuity improved from 0.4 ± 0.3 LogMAR to 0.0 ± 0.0 LogMAR (p < 0.01). Refractive outcome was very good for far and intermediate visions, whereas a spherical addition of at least + 1.0D was required for near vision. The mean Quality of Vision score was of 15.5 ± 6.5. The most complained visual disturbances were haloes and glares, although resulting well-tolerated. Dynamic pupillometry findings well-correlated with the amount of complained post-operative visual discomforts.

CONCLUSIONS

AcrySof® IQ Vivity® IOL is a well-tolerated choice to correct far and intermediate vision. Spectacles are needed to optimize near vision. Our data strongly suggest dynamic pupillometry as a useful investigation to optimize post-operative refractive success.

Performance and Safety of the Extended Depth of Focus Implantable Collamer® Lens (EDOF ICL) in Phakic Subjects with Presbyopia

Purpose

To evaluate the performance and safety of the Extended Depth of Focus Implantable Collamer^® Lens (EDOF ICL) for improvement of uncorrected near, intermediate and distance visual acuity in phakic subjects with myopia and presbyopia.

Design

Prospective multicenter study.

Methods

Presbyopic subjects who required an EDOF ICL in the range of −0.50 D to −18.00 D, exhibited ≤ 0.75 D refractive astigmatism and required from +1.00 to +2.50 D reading add were implanted bilaterally. Assessments at 6 months included uncorrected near, intermediate and distance visual acuities, defocus curves, contrast sensitivity, responses to the National Eye Institute Refractive Error Quality of Life Questionnaire and a Task Assessment Questionnaire.

Results

A total of 34 subjects completed the study. Investigators targeted emmetropia in all eyes. Mean binocular uncorrected near, intermediate and distance visual acuities measured logMAR −0.01 ± 0.05 (20/20), −0.02 ± 0.08 (20/19) and 0.07 ± 0.10 (20/23), respectively. Mean monocular uncorrected near, intermediate and distance visual acuities measured logMAR 0.068 ± 0.09 (20/23), 0.062 ± 0.10 (20/23) and 0.16 ± 0.12 (20/29). There were no clinically or statistically significant differences in contrast sensitivity between baseline and 6 months under any testing conditions. Subjects reported significant improvements in measures of vision-related quality of life and ability to perform tasks at all distances without glasses or contact lenses. Overall, satisfaction with the EDOF ICL was high: postoperatively, 91.2% of subjects were satisfied with their vision.

Conclusion

This multicenter, prospective clinical investigation demonstrated the ability of the EDOF ICL to correct myopia and presbyopia, resulting in improvement of uncorrected near, intermediate and distance visual acuity without compromising the quality of vision. The EDOF ICL allowed subjects to perform tasks of daily living without glasses or contact lenses. Subjects reported significant improvements in quality of life with high levels of spectacle independence and satisfaction.