In vivo Meibomian gland imaging techniques: A review of the literature

Scleral Contact Lens Benefits for Myopic Patients With Regular Corneas: A Prospective Randomized Study

OBJECTIVES

To evaluate the impact of scleral contact lens (SL) wear on the visual quality and the ocular surface wettability in myopic patients with regular corneas.

METHODS

This prospective, randomized, controlled study enrolled a total of 80 myopes with regular corneas. Subjects were randomly allocated to wear SL or rigid corneal lens (RCL) for 3 months. The objective optical quality parameters were detected using the Optical Quality Analysis System-II, and the ocular surface wettability was assessed using the Keratograph 5M noninvasive ocular surface analyzer. The National Eye Institute 25-Item Visual Function Questionnaire and Ocular Surface Disease Index questionnaire were performed.

RESULTS

Both SL and RCL wear could obtain good best-corrected visual acuity. Strehl ratio, modulation transfer function cutoff frequency, objective scattering index, and Optical Quality Analysis System values (Optical Quality Analysis System values at 100%, 20%, and 9% contrasts) in the SL group significantly improved from baseline to the third month (both P <0.05), but not in the RCL group. At the third month, tear meniscus height and noninvasive tear break-up time showed a significant increase in the SL wearers from baseline (both P <0.05), but exhibited no significant changes in the RCL group. At the third month, SL wearers had significantly higher noninvasive tear break-up time compared with RCL wearers ( P <0.05). Besides, after 3-month SL wear, the National Eye Institute 25-Item Visual Function Questionnaire score and the Ocular Surface Disease Index score both remarkably improved from baseline (both P <0.05).

CONCLUSION

Short-term SL wear could provide satisfactory visual quality, ocular comfort, and stable tear film for myopic patients.

Ocular Involvement in Graft-versus-Host Disease

In ocular graft-versus-host disease (GVHD), an inflammatory reaction occurs at the ocular surface after transplantation of allogeneic hematopoietic stem cells. Self-reactive T cells of the donor are particularly responsible for this. This can lead to a pronounced wetting disorder of the ocular surface, conjunctival hyperemia, and corneal ulceration up to perforation. The ocular GVHD is associated with a high degree of suffering, such as pain, photophobia, and reduction in visual acuity. This review provides an overview of typical ophthalmological findings, topical and systemic therapeutic approaches, and concomitant measures (e.g., scleral lenses, punctum plugs) and the appropriate management of complications.

Evaluation of Celligent® Biomimetic Water Gradient Contact Lens Effects on Ocular Surface and Subjective Symptoms

This study aimed to evaluate the non-invasive and subjective symptoms associated with Lehfilcon A water gradient silicone hydrogel contact lenses with bacterial and lipid resistance technology. A prospective, longitudinal, single-centre, self-controlled study was conducted among silicone hydrogel contact lens wearers. Non-invasive analysis of the pre-lens tear film was performed using the Integrated Clinical Platform (ICP) Ocular Surface Analyzer (OSA), and the meibomian glands were evaluated with the Cobra® HD infrared meibographer. After 30 days of contact lens wear, the subjects were re-evaluated to determine the changes in conjunctival redness, subjective dry eye disease, tear meniscus height, lipid pattern, and non-invasive break-up time. Results showed that the lipid layer thickness decreased significantly from 2.05 ± 1.53 to 0.92 ± 1.09 Guillon patterns, and the tear meniscus height decreased from 0.21 ± 0.04 to 0.14 ± 0.03. The mean pre-lens non-invasive break-up time (NIBUT) significantly increased from 15.19 ± 9.54 to 25.31 ± 15.81 s. The standard Patient Evaluation of Eye Disease (SPEED) score also decreased from 7.39 ± 4.39 to 5.53 ± 4.83. The results suggest that Lehfilcon A significantly reduced lipid and aqueous tear film volume but improved break-up time and subjective dry eye symptoms.

Challenges and concepts in the diagnosis and management of ocular graft-versus-host disease

Graft-versus-host disease (GVHD) is characterized by tissue inflammation in the host following an allogeneic hematopoietic cell transplantation (HCT). The pathophysiology is complex and only incompletely understood yet. Donor lymphocyte interaction with the histocompatibility antigens of the host plays a crucial role in the pathogenesis of the disease. Inflammation may affect multiple organs and tissues, e.g., the gastrointestinal tract, liver, lung, fasciae, vaginal mucosa, and the eye. Subsequently, alloreactive donor-derived T and B lymphocytes may lead to severe inflammation of the ocular surface (i.e., cornea and conjunctiva) and the eyelids. Furthermore, fibrosis of the lacrimal gland may lead to severe dry eye. This review focuses on ocular GVHD (oGVHD) and provides an overview of current challenges and concepts in the diagnosis and management of oGVHD. Ophthalmic manifestations, diagnostic procedures, grading of severity and recommendations for ophthalmic examination intervals are provided. Management of ocular surface disease with lubricants, autologous serum eye drops, topical anti-inflammatory agents and systemic treatment options are described based on the current evidence. Ocular surface scarring and corneal perforation are severe complications of oGVHD. Therefore, ophthalmic screening and interdisciplinary treatment approaches are highly relevant to improve the quality of life of patients and to prevent potentially irreversible visual loss.

Clinical, Meibographic, and Interferometric Evaluation in Children With Ocular Rosacea

PURPOSE

To describe clinical, meibographic, and interferometric signs in children with ocular rosacea.

DESIGN

Prospective case-control study.

METHODS

This single-center study at the Fondation Ophtalmologique Rothschild (Paris, France) included 42 children with ocular rosacea and 44 healthy volunteers (median ages of 10 and 11 years old, respectively) who had infrared meibography images of their lower lids and tear lipid layer thickness measurements taken with the LipiView II device (Tearscience). Clinical severity was graded on a 0 to 4 scale and compared with meiboscores (range 0-4) and tear film lipid layer thickness (range 0-100 nm).

RESULTS

Seven patients presented with unilateral disease and 29 had an asymmetrical form. Twenty-four patients had associated cutaneous rosacea. Ten of 84 eyes presented with a loss of vision <20/25. The mean clinical severity grade was 2.5 ± 1.4. Meibographic abnormalities were significantly more important in children with ocular rosacea (mean meiboscore 2.1 ± 1.36) than in healthy volunteers (0.61 ± 0.78, P < .001). Clinical severity (r = 0.44, P < .001), duration of disease (r = 0.28, P = .011), and a history of chalazia (r = 0.30, P = .006) were correlated to meibographic severity. Mean lipid layer thickness was not significantly different between cases and controls (74.4 ± 18.7 nm and 76.6 ± 18 nm, respectively, P = .47).

CONCLUSION

Meibomian structural alterations in children can be severe and are correlated to ocular rosacea severity. Meibography is an essential tool for diagnosis and follow-up, whereas the contribution of tear film interferometry is uncertain.

The impact of contact lenses on meibomian gland morphology

Despite years of experience with contact lenses, controversy remains as to whether contact lenses adversely impact the meibomian glands (MG). This review summarizes the present body of evidence, showing that contact lens wear is associated with alterations in MG morphology (up to 80% higher gland atrophy compared to non-wearers) and qualitative changes in MG secretion. Key factors such as duration of contact lens wear, contact lens type (e.g., soft vs. rigid), edge design, and material modulus of elasticity are discussed in relation to the extent of MG morphological changes, the quality of MG secretion and other ocular surface parameters. Longitudinal studies of sufficient statistical power are needed to better understand how contact lens wear affects the MG, risk factors, and the clinical sequelae of these changes.

[Combined Intense Pulsed Light and low-level light therapy in the treatment of Meibomian gland dysfunction]

INTRODUCTION

Meibomian gland dysfunction (MGD) is the most common cause of dry eye syndrome. The goal of this study was to evaluate the efficacy of combined intense pulsed light (IPL) and low-level light therapy (LLLT) in symptomatic MGD.

MATERIALS AND METHODS

This retrospective study analyzed data from 30 patients with MGD causing dry eye symptoms not relieved by medical therapy and managed with combined IPL and LLLT. The primary endpoint was the Ocular Score Disease Index (OSDI) score at 1 month and 1 year. Secondary endpoints were visual acuity, intraocular pressure, tear film break-up time, Schirmer's test, Oxford score, and infrared meibographic score at 1 month after the conclusion of treatment.

RESULTS

The mean OSDI score decreased from 43±19 to 17±12 (1 month; p<0.0001) and then to 29±11 (12 months; p=0.013); 63% of patients were meibographic grade 2 before versus 7% after treatment (range, 1-4) (p=0.009); 75% of patients were Oxford grade 1 before versus 41% after treatment (p=0.004) (range, 1-3). No significant difference in the other secondary endpoints was noted.

CONCLUSION

Over time, IPL therapy in combination with LLLT appears to improve patients with symptomatic MGD resistant to medical therapy.