Dr. Andrei Solomatin Profile

Dr. Andrei Solomatin

at Dr Solomatin eye center

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Proceedings Article | 19 May 2022 Presentation + Paper

Contrast sensitivity at different background brightness levels and objective scattering index changes in patients before and after cataract removal surgery

Z. Jansone-Langina, R. Truksa, M. Ozolins, A. Solomatin, I. Solomatins

Proceedings Volume 12147, 121470B (2022) https://doi.org/10.1117/12.2624513

KEYWORDS: Contrast sensitivity, Surgery, Spatial frequencies, Visualization, Light scattering, Scattering, Eye, Light sources and illumination, Opacity, Spherical lenses

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Purpose: Neurosensory vision tests can be an additional test to define the progression of cataract. Contrast vision tests can be a useful method to determine if the surgery is needed and the tests help to understand patient complaints about daily life tasks like driving. Our aim was to estimate the contrast vision sensitivity at different background levels and compare light scattering in patients before and after cataract surgery. Methods: Our research investigated 82 patients (73 eyes) with cataract and 56 (112 eyes) control group patients. The contrast sensitivity was measured with alternative forced choice test design (AFC) before and two weeks after Femto laser cataract surgery. The objective scattering index (OSI) was measured with HD Analyzer (Version 2.7.0.0). Contrast vision measurements were performed under mesopic conditions at different background brightness levels: 60 cd/m² ; 85 cd/m2 ; 100 cd/m² , and spatial frequencies:4 cpd; 6 cpd; 12 cpd; 18 cpd. Results: At the background brightness level 60, 85 and 100 cd/m2 there was statistically significant difference in all the spatial frequencies results, between all the groups (p<0.0001). The average OSI before the cataract surgery was 3.75 ± 1.62 units and OSI had a negative correlation with visual acuity (r=0.80) Conclusion Cataract-induced light scattering significantly decreased contrast sensitivity at all spatial frequencies There were no statistically significant differences between the Weber constants at the different background lighting levels, between all the groups. At a lighting level of 60 cd/m² , cataract surgery provided significant improvement at the average spatial frequencies.

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