ArticleInternational journal of ophthalmology2025
Effect of polarized sunglasses on visual functions.
Article in International journal of ophthalmology, 2025. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Not yet cited in PubMed.
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4 authors.
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Abstract
aimTo evaluate the effects of polarized and non-polarized sunglasses on visual functions, including distance and near visual acuity, phoria, stereopsis and contrast sensitivity across five spatial frequencies (1.5, 3, 6, 12, 18 cycles/degree).
methodsA before-after study was conducted on 45 emmetropic students from Shahid Beheshti University of Medical Sciences. Visual acuity, contrast sensitivity, stereopsis and phoria were measured under three conditions: without sunglasses, with non-polarized sunglasses and with polarized sunglasses. Tests were conducted under controlled glare conditions to simulate outdoor environments.
resultsA total of 45 participants were evaluated, comprising 17 males (37.8%) and 28 females (62.2%). The mean age was 21.67±2.31y (range 18-27y). The mean of distance and near visual acuity in all three conditions were equal to 0.00 logMAR. Contrast sensitivity generally decreased slightly with the use of non-polarized sunglasses compared to the no-sunglasses condition. The mean stereopsis with polarized sunglasses was 101.33±56.139 arc sec, which was worse than the no-sunglasses condition (94.33±46.632 arc sec) and better than the non-polarized sunglasses condition (105.67±58.965 arc sec), although these changes were not significant. In the phoria parameter, distance phoria appeared more affected than near phoria.
conclusionPolarized and non-polarized sunglasses do not significantly affect visual acuity, stereopsis, or phoria under controlled glare conditions. Slight changes in contrast sensitivity are noted, but they are not statistically significant.
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