Changes in Accommodation and Binocular Vision Change after Excimer Laser Photorefractive Keratectomy.

Cho, Jin Man; Kim, Wan Soo; Lee, Do Yong

Original Article

Journal of the Korean Ophthalmological Society 1997;38(8):1393-1400.
Published online August 1, 1997.

Changes in Accommodation and Binocular Vision Change after Excimer Laser Photorefractive Keratectomy.

Jin Man Cho, Wan Soo Kim, Do Yong Lee

Department of Ophthalmology, Maryknoll Hospital, Pusan, Korea.

엑시머레이저 각막연마술후 조절과 입체시 기능의 변화

조진만(Jin Man Cho),김완수(Wan Soo Kim),이도용(Do Yong Lee)

Abstract

Many patients complain of near vision difficulty after PRK surgery. In the prospective study, we report the effect of PRK surgery for myopia on accommodation and binocular vision. 45 myopic eyes (39 patients, 9 males, 30 females) underwent PRK for myopia. Mean preoperative amplitude of accommodation in moderate degree myopia (group 1 < OR = -6.00D in shperical equivalent : range -2.45 ~ -6.00D) was 7.01+/-1.25D, mean preoperative amplitude of accommodation in high degree myopia (group 2 > -6.00D in spherical equivalent : range -6.10 ~ -10.75D) was 6.85+/-1.41D. Mean postoperative amplitude of accommodation of group 1 was 8.13+/-1.38D, mean postoperative amplitude of accommodation of group 2 was 7.80+/-1.33D, the difference of both groups were statistically significant(p>0.05). Mean preoperative amplitude of accommodation of all patients was 6.91+/-1.35D, mean postoperative amplitude of accommodation was 7.93+/-1.36D, the difference are statistically significant (p>0.01). 12 of 39 patients complained of near vision difficulty while reading after PRK surgery on their one eye, but 3 of them who underwent PRK surgery on their the other eye noticed the disappearance of near vision difficulty. Stereopsis was tested and 15 of 36 patient lost more than 50 sec/arc of streoacuity. Near vision difficulty was not related to the amount of myopia corrected, not related to the stereoacuity change but seemed to related to their adaptability or their reaction time of accommodation with their operated eyes.

Key Words: Accommodation;Accommodation amplitude;Binocular vision;Steropsis