Introduction: Presently, the diagnosis of cataracts relies upon the utilization of a slit lamp. This method of examination is inherently subjective, contingent upon the level of expertise possessed by the attending ophthalmologist. That is why our aim was to evaluate lens thickness parameter’s utility for cataract diagnoses. Method: We investigated 1750 patients (age 40 till 75) which were separated in two groups: cataract patients (n=750) and control group (n = 1000). The lens thickness parameter (LT) and anterior chamber depth (ACD) were measured with IOLMaster® 700 (Zeiss) and analyzes with ANOVA test, The IOLMaster® 700 is a frequently used device which is utilized for intraocular lens (IOL) measurements. Results: Overall results demonstrates that the cataract groups lens thickness parameter (mean 4.89 ± 0.11mm) was greater than control groups (mean 4.69 ± 0.17mm) and there was a statistically significance between the results (p = 0,01). Control groups ACD results showed similarities with cortical cataract results and there were overlapping (p = 0.15). Conclusion: Lens thickness parameter can be used as an additional criterion to differentiate cataract diagnoses.
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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