PT  - JOURNAL ARTICLE
AU  - Kamiya, Kazutaka
AU  - Kobashi, Hidenaga
AU  - Shimizu, Kimiya
AU  - Kawamorita, Takushi
AU  - Uozato, Hiroshi
TI  - Effect of pupil size on uncorrected visual acuity in astigmatic eyes
AID  - 10.1136/bjo.2011.202481
DP  - 2012 Feb 01
TA  - British Journal of Ophthalmology
PG  - 267--270
VI  - 96
IP  - 2
4099  - http://bjo.bmj.com/content/96/2/267.short
4100  - http://bjo.bmj.com/content/96/2/267.full
SO  - Br J Ophthalmol2012 Feb 01; 96
AB  - Aim To 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 26.7±4.9 years (mean±SD); 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.Results In eyes with with-the-rule astigmatism of 1, 2 and 3 D, logMAR UCVA was 0.04±0.08, 0.09±0.09 and 0.16±0.16 for 1 mm pupils, −0.01±0.09, 0.12±0.15 and 0.33±0.24 for 2 mm pupils, 0.02±0.09, 0.20±0.19 and 0.46±0.30 for 3 mm pupils, 0.02±0.08, 0.24±0.20 and 0.48±0.21 for 4 mm pupils, and 0.08±0.10, 0.33±0.18 and 0.53±0.22 for 5 mm pupils, respectively. The variance of the data was statistically significant (p=0.03 for 1 D, p<0.001 for 2 D, p<0.001 for 3 D, analysis of variance). Similar results were obtained in eyes with against-the-rule astigmatism.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.