目的:探讨在暗环境下瞳孔大小对对比度视力的影响。方法:应用多功能电子视力测量仪(MFVA-100)及Allegroanalyzer波前像差仪测量42例84眼在暗环境中的对比度视力及瞳孔直径,以瞳孔直径的均值5.6mm为界分为两组,比较不同瞳孔大小范围时的对比度视力,并分析瞳孔大小与对比度视力的相关性。结果:在对比度25%和10%的情况下,瞳孔直径范围在(4.0～5.5)mm时的对比度视力分别为(0.158±0.097)及(0.374±0.099),优于范围为(5.6～7.2)mm时的对比度视力,差异有统计学意义(P<0.02),在对比度10%时的差异较对比度为25%时的差异小,在对比度100%和5%时,瞳孔直径范围为(4.0～5.5)mm与范围为(5.6～7.2)mm时两组间的对比度视力的差异无统计学意义;瞳孔直径范围为(4.0～5.5)mm和范围为(5.6～7.2)mm时,随直径的增加,各对比度下的对比度视力下降,瞳孔直径与对比度视力有明显的正相关(P<0.05)。结论:不同直径的瞳孔在一定条件下可明显影响对比度视力,从而影响夜间视觉质量,对术前暗环境下瞳孔大小的测量,是决定角膜屈光手术方式的重要指标之一。

AIM:To investigate the effect of different pupil diameter on contrast visual acuity in dark environment·METHODS:Pupil diameter and contrast visual acuity from 42 case(84 eyes)before LASIK surgery were measured with multi-functional visual acuity tester(MFVA-100) and Allegro wavefront analyzer,comparing the contrast visual acuity related to different pupil diameter and analysing their relationships·RESULTS:Contrast visual acuity was(0.158±0.097)and(0.374±0.099) respectively when pupil diameter ranged from 4.0mm to 5.5mm on both contrast of 25% and 10%,better than the contrast visual acuity when pupil diameter ranged from 5.6mm to 7.2mm,the difference was significant(P<0.02),the difference of contrast visual acuity in 25% was more evident than that in 10%;There were no significant difference when pupil diameter ranged from 4.0mm to 5.5mm and 5.6mm to 7.2mm on both contrast of 100% and 5%(P>0.1);contrast visual acuity(100%,25%,10%,5%) were decreased with the increase of pupil diameter whether from 4.0mm to 5.5mm or from 5.6mm to 7.2mm,there was a positive correlation between them·CONCLUSION: Different pupil diameters could affect the contrast visual acuity obviously under certain conditions,and influence the night visual performance accordingly.The measurement to the pupil size on dark environment before LASIK surgery is one of the important index affecting corneal refractive surgical procedures.

R779.63