Scleral asymmetry as a potential predictor for scleral lens compression

Autor:	D. Robert Iskander, Jos J. Rozema, Joséphine Behaegel, Alejandra Consejo, Maarten Van Hoey
Přispěvatelé:	Surgical clinical sciences, Faculty of Medicine and Pharmacy, Ophtalmology - Eye surgery
Rok vydání:	2018
Předmět:	Adult Male medicine.medical_specialty Materials science impingement genetic structures Contact Lenses media_common.quotation_subject Visual Acuity Miniscleral contact lens Asymmetry law.invention Cornea 03 medical and health sciences 0302 clinical medicine Scleral lens law Ophthalmology medicine Inner diameter Humans Fourier profilometry media_common lens compression Healthy subjects Corneal Topography Reproducibility of Results Equipment Design Anterior eye surface corneo-scleral topography Compression (physics) Refractive Errors eye diseases Sensory Systems Healthy Volunteers Lens (optics) Contact lens 030221 ophthalmology & optometry Female Human medicine sense organs 030217 neurology & neurosurgery Sclera Tomography Optical Coherence Optometry
Zdroj:	Ophthalmic and physiological optics
ISSN:	1475-1313 0275-5408
Popis:	Purpose To identify the position and magnitude of lens compression due to short‐term miniscleral contact lens wear, as well as evaluating the usefulness of scleral asymmetry as a predictor for scleral lens decentered compression. Methods Fourteen healthy subjects (mean ± S.D.: 29.2 ± 6.0 years) wore a highly gas‐permeable spherical haptic miniscleral contact lens during a 5‐h period. Corneo‐scleral height Fourier profilometry was captured using an Eye Surface Profiler (www.eaglet-eye.com) before and immediately after lens removal. Scleral asymmetry, lens compression location and magnitude were processed using custom‐made algorithms, both globally and for scleral quadrants. Results Miniscleral contact lenses do not set uniformly on the ocular surface, with the largest decentration seen along the horizontal meridian. The greatest flexural stress exerted by the lens on the ocular surface occurs at the point coinciding with the inner diameter landing point of the lens and not with its overall diameter. Scleral asymmetry was significantly correlated with compression location (R = 0.71, p = 0.002) and compression magnitude (R = 0.81, p < 0.001), showing its potential as compression predictor. Conclusion Larger amounts of scleral asymmetry will lead to more decentration of spherical haptic scleral lenses. Objective and accurate methods, like the one presented here, could help the practitioner prevent cases of scleral blanching or discomfort due to an excessive compression by the lens.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_dedup___::6c756360f73aaa63f31e909edeac5060 https://pubmed.ncbi.nlm.nih.gov/30450747 Zobrazit plný text záznamu Plný text ve formátu PDF Plný text ve formátu HTML
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