亮环境下军事直升机飞行学员不同对比度视力的分布特征  

Distributional characteristics of different contrast visual acuity under bright background in military helicopter flight cadets

作　　者：赵瑞华[1] 陈乾[2] 赵蓉[3] 王恩普[3] 姜彩辉[3] 

机构地区：[1]辽宁医学院空军总医院研究生培养基地,北京100142 [2]陆军航空兵学院,北京101123 [3]空军总医院眼科,北京100142

出　　处：《解放军医学院学报》2015年第1期42-45,共4页Academic Journal of Chinese PLA Medical School

基　　金：国家科技部"十二五"科技支撑计划项目(BKJ13J003)~~

摘　　要：目的观察军事直升机飞行学员在亮环境下不同对比度的视力变化情况。方法应用多功能电子视力测量仪(MFVA-100)检查86例(172眼)直升机飞行学员在亮环境中不同对比度(100%、25%、10%、5%)左右眼的log MAR视力,并分析不同对比度视力的相关性。结果在对比度100%、25%、10%、5%的log MAR视力右眼分别为-0.001±0.128、0.257±0.152、0.537±0.158、0.726±0.174;左眼分别为0.003±0.127、0.248±0.156、0.521±0.170、0.706±0.197;随对比度下降,视力呈下降趋势,高对比度组视力明显好于低对比度组(P<0.05)。左右眼在相同对比度下的视力无统计学差异(P>0.05)。100%对比度与25%、10%、5%对比度均呈正线性相关(P<0.05)。结论不同对比度是影响视力的重要因素,对比度越低,视力波动越明显。Objective To investigate the variation of visual acuity（VA） at different contrast levels under bright background in military helicopter flight cadets. Methods Eighty-six military helicopter flight cadets（172 eyes） with normal VA were enrolled. log MAR VA was measured at 4 contrast levels（100%, 25%, 10%, 5%） under bright background with multi-functional visual acuity tester（MFVA-100）. The relationship of VA at different contrast levels under bright background was analyzed. Results log MAR VA of 100%, 25%, 10%, and 5% in right eye were-0.001±0.128, 0.257±0.152, 0.537±0.158, 0.726±0.174, respectively; log MAR VA of 100%, 25%, 10%, and 5% in left eye were 0.003±0.127, 0.248±0.156, 0.521±0.170, 0.706±0.197, respectively. Visual acuity decreased gradually with a decrease in the contrast level, and it was significantly better at high contrast than that at low contrast（P 0.05）. Visual acuity（VA） was of no statistically significant difference between right and left eye in the same contrast level（P 0.05）. Visual acuity at 100% contrast was linearly related to the visual acuity at 25%, 10%, 5% contrasts respectively（P 0.05）. Conclusion The different contrast levels significantly affect contrast visual acuity. The lower the contrast is, the larger visual acuity changes.

关 键 词：对比度视力 飞行学员 直升机 

分 类 号：R770.4[医药卫生—眼科]