Effect of pupil size on uncorrected visual acuity in astigmatic eyes

Abstract

AimTo determine the effects of pupil size on uncorrected visual acuity (UCVA) in astigmatic eyes. Methods The authors examined 20 normal eyes of 20 healthy volunteers (age 26.764.9 years (mean6SD); 8 men, 12 women). After fully correcting cycloplegic refraction, the authors created with-the-rule and against-the-rule astigmatism of 1, 2, and 3 dioptres (D) in each eye, and then assessed UCVA using artificial pupils (1 to 5 mm) in these astigmatic eyes. Measurements were performed three times, and the mean value was used for statistical analysis. Conclusions Both the amount of astigmatism and the pupil size can affect UCVA in astigmatic eyes. It is suggested that not only the amount of astigmatism but also the pupil size should be taken into consideration for acquiring better visual performance in astigmatic eyes.

Influence of simple myopic against-the-rule and with-the-rule astigmatism on visual acuity in eyes with monofocal intraocular lenses

“…It is known that a smaller pupil size enhances the depth of focus and apparent accommodation in pseudophakic eyes [37][38][39][40][41], which would theoretically be advantageous to uncorrected visual acuity after cataract surgery. Moreover, it has been shown that uncorrected visual acuity in phakic eyes is affected by both pupil size and amount of astigmatism [42]. In our results, although UDVA was significantly better in eyes with WTR astigmatism than in those with ATR astigmatism, pupil size and amount of astigmatism were not significantly different between the groups.…”

Influence of additional astigmatism on distance-corrected near visual acuity and reading performance

“…The authors postulated that optical quality decreases as pupil size increases. Kamiya et al 22 found that uncorrected visual acuity is better in eyes with smaller pupil diameter as this reduces all aberrations and increases depth of focus. In this study the use of an artificial pupil would have attenuated the effects of defocus.…”

Corneal Thickness Profile and Posterior Corneal Astigmatism in Normal Corneas

“…Thus, evaluation of corneal thickness profile on the 4.5-mm annular ring might be more ideal. In addition, Kamiya et al 28 reported that not only the magnitude of astigmatism but also pupil size can affect the uncorrected visual acuity in astigmatic eyes. Therefore, it will be intriguing to perform pachymetric and astigmatic analyses on circles covering different diameters in accordance with the individual pupil sizes, which might be the theme of future studies.…”