Evaluation of the impact of tear layer thickness in scleral lenses on the optical quality of the eye by means of the double-pass system HD Analyzer
Session Details
Session Title: Presented Poster Session: Glaucoma and Imaging
Venue: Poster Village: Pod 3
First Author: : M.Trone FRANCE
Co Author(s): : T. Garcin G. Thuret P. Gain
Abstract Details
Purpose:
To evaluate the impact of tear layer thickness in scleral lenses on the optical quality of the eye by means of the double-pass system.
Setting:
Ophthalmology, University Hospital of Saint-Etienne, France.
Methods:
24 eyes of 12 healthy patients with regular corneas and a best corrected visual acuity ≥ 20/20 were adapted in scleral glasses SPOT (LAO, France) M3 on the right eye and S3 on the left eye.
Tear layer thickness was measured by anterior segment OCT and optical quality was evaluated by HD Analyzer.
Then, they were adapted in shallower scleral lenses: SPOT M2 for the right eye and S2 for the left eye with the same examinations.
Results:
There is a statistically significant difference between optical scattering index (OSI) without scleral lens : 0,5 (0,26 – 0,74) and that with scleral lenses : 0,95 (0,38 - 1,51), p value 0,004. (Wald test with linear mixt effect model).
Others statistical analyzes on MTF cut off, Strehl ratio and between different lenses sizes are not significant, probably due to the small number of patients.
Conclusions:
Tear layer of scleral lenses has an impact on the optical quality of the eye, in particular on OSI. This is due to the difference in index between tears and air.
This can be measured easily by HD analyzer.
This double-pass system allows an objective measurement of the optical quality of the eye by quantifying the combined effects of optical aberrations and intraocular scattering. No data on this subject have been reported.
Financial Disclosure:
NONE
