The effect of LASIK on best-corrected high- and low-contrast visual acuity

被引:18
作者
Bailey, MD
Olson, MD
Bullimore, MA
Jones, L
Maloney, RK
机构
[1] Ohio State Univ, Coll Optometry, Columbus, OH 43210 USA
[2] Univ Calif Los Angeles, Sch Med, Jules Stein Eye Inst, Dept Ophthalmol, Los Angeles, CA 90024 USA
[3] Maloney Vis Inst, Los Angeles, CA USA
关键词
corneal refractive surgery; laser in situ keratomileusis; low-contrast visual acuity; low luminance; visual function;
D O I
10.1097/01.opx.0000134910.28898.ce
中图分类号
R77 [眼科学];
学科分类号
100212 ;
摘要
Purpose. To evaluate the effects of laser in situ keratomileusis (LASIK) and LASIK with concurrent astigmatic keratectomy (LASIK/AK) on high- and low-contrast visual acuity. Methods. The setting was a university refractive surgery practice. Patients were recruited from those undergoing LASIK or LASIK/AK for myopia (>1.00 D spherical equivalent) between May 1996 and August 1997. All subjects were at least 21 years of age. Testing occurred preoperatively and 3 and 6 months after LASIK. Main outcome measures were best spectacle-corrected, high- and low-contrast visual acuity. Results. For all subjects, there was a significant effect of surgery on nondilated low-contrast visual acuity (repeated measures two-way analysis of variance, p < 0.0001). Tukey's posthoc analysis showed that preoperative low-contrast visual acuity scores were significantly different from 3-month [0.08 logarithm of the minimum angle of resolution (logMAR)] and 6-month (0.11 logMAR) scores for patients undergoing LASIK and LASIK/AK. Under dilated conditions, there was a significant effect of surgery for high- and low-contrast visual acuity (analysis of variance, p < 0.0001 for both). Only changes in low-contrast visual acuity were clinically meaningful [LASIK, visual acuity reduction of 0.1 logMAR (1 line); LASIK/AK, visual acuity reduction of 0.15 logMAR (1.5 lines)]. When considering high and low myopes separately (LASIK only), the level of myopia had a significant effect on the visual acuity after surgery (analysis of variance, p = 0.01). Preoperative, dilated, low-contrast visual acuity scores for high myopes were significantly different from 3-month (0.14 logMAR) and 6-month (0.13 logMAR) scores. No differences were noted for low myopes. Conclusions. Clinically meaningful postoperative changes in low-contrast visual acuity were noted in patients undergoing LASIK and LASIK/AK under natural and dilated conditions. Postoperative, dilated, low-contrast visual acuity scores were significantly worse than preoperative scores for high myopes, but remained unchanged for low myopes.
引用
收藏
页码:362 / 368
页数:7
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