Rafia Batool, Sadaf Qayyum, Qurat -ul Ain, Shahid Iqbal, Sohail Ahmad.
Effect of Ametropic Spectacles Correction on Contrast Sensitivity.
Al-Shifa J Ophthalmol Jul ;17(4):183-90.

Background: The disruption of normal visual experience may lead to the development of refractive error. Contrast sensitivity is a vital visual function for accurate vision in normal and dim light. Early detection of decrease in contrast sensitivity and taking measures at early stage help the patient to perform their daily activities easily even if they have 6/6 visual acuity. Objectives: To find out the effect of ametropic spectacle correction on contrast sensitivity. Methodology: A descriptive cross-sectional study was carried out Al-Shifa Eye Trust Hospital Rawalpindi within the duration of six months. Total of 90 ametropic patients, including 56 (62.2%) females and 34 (37.8%) males were included in the study after qualifying on the basis of inclusion and exclusion criterion. The refractive errors were categorized in to mild (+_0.25 D to +_2.00D), moderate (+_2.25D to +_4.00D) and severe (>+_4.00D) degrees and the contrast sensitivity was measured for each group. Descriptive and inferential statistics was used to analyze the result. A self-structured Performa was used and analyzed using SPSS version 26. Results: The results showed that there was no significant (p=0.145) decrease of contrast sensitivity in myopic spectacle correction 27 (30.0%), while in Hypermetropic spectacle correction 33 (36.7 %) had considerable decrease in contrast sensitivity which was significant (p = 0.018 While in astigmatic spectacle correction 30 (33.3%) had more significant decrease in contrast sensitivity than the non-astigmatic ones (p=0.017). Conclusion: Contrast sensitivity is very important to measure and should be taken in to consideration while doing subjective correction for the correction of refractive errors. Despite the fact that the measure of visual acuity gives essential clinical data, the ability to quantify contrast sensitivity in a clinical setup has much significance in all ages.

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