Accommodative changes after photorefractive keratectomy in myopic eyes.
OBJECTIVE
To determine the changes of amplitude of accommodation (AA) and facility of accommodation (FA) in myopic patients after photorefractive keratectomy (PRK).


METHODS
Using Technolas 217Z excimer laser, 160 myopic eyes of 80 patients underwent PRK. The patients were categorized into two age groups: <30 and ≥30 years. Changes in AA and FA were observed before PRK and at 2 weeks, 1 month, and 3 months after PRK. The role of preoperative AA, FA, refractive spherical equivalent, age, and sex on postoperative AA and FA was evaluated.


RESULTS
In younger patients, the preoperative AA and FA values 7.77 ± 1.75 D and 7.75 ± 3.97 cpm changed to 8.36 ± 1.26 D and 11.57 ± 4.20 cpm (p < 0.001), respectively, at 3 months after PRK. In older patients, the preoperative AA and FA values 6.66 ± 1.41 D and 5.05 ± 3.26 cpm changed to 6.72 ± 1.26 D (p = 1.000) and 9.58 ± 4.29 cpm (p < 0.001), respectively. Two weeks after surgery, preoperative AA and spherical equivalent had a significant effect on postoperative AA, whereas preoperative AA and age had a significant effect on postoperative AA after 3 months (p < 0.001). Postoperative FA was positively related to preoperative FA and female sex (p < 0.05).


CONCLUSIONS
This study suggests that some of the near-vision problems in younger myopes in early postoperative days after PRK might be due to decrease in AA and FA, which will eventually increase. However, in older patients, despite increase in FA, AA did not change.
Karimian
Farid
F
Ophthalmic Research Center, Shahid Beheshti University of Medical Sciences, Tehran, Iran. karimianf@yahoo.com
Baradaran-Rafii
Alireza
A
Bagheri
Abbas
A
Eslani
Medi
M
Bayat
Homa
H
Aramesh
Shila
S
Yaseri
Mehdi
M
Amin-Shokravi
Anahita
A
D000065:Accommodation, Ocular; D000328:Adult; D000367:Age Factors; D005260:Female; D006801:Humans; D008297:Male; D009216:Myopia / Q000503:physiopathology* / Q000601:surgery*; D018903:Photorefractive Keratectomy; D011184:Postoperative Period; D055815:Young Adult