不同背景亮度下人工晶体植入眼与正常眼对比敏感度视力的比较

背景：有关人工晶体植入眼与正常眼对比敏感度视力的比较还少见报道。目的：比较人工晶体植入眼与正常眼不同对比敏感度下的视功能。方法：实验组选择白内障超声乳化摘除并植入人工晶体且随访资料完整的病例25例(41眼),对照组选择年龄、性别与实验组相匹配的正常人18例(31眼)。在最佳远校正状态下采用多功能电子视力测量仪测试两组亮暗环境下不同对比敏感度(100%,25%,10%,5%)视标的LogMAR视力。结果与结论：①亮背景：随着对比敏感度的下降,两组视功能均逐渐下降。在100%,25%,10%对比敏感度下,两组LogMAR视力均无差异(P > 0.05),在5%对比度下,实验组LogMAR视力低于对照组(P < 0.05)。②暗背景：随着对比敏感度的下降,两组视功能均逐渐下降。在100%,25%对比度下,两组LogMAR视力无差异(P > 0.05),在10%和5%对比敏感度下,实验组LogMAR视力低于对照组(P < 0.05,P < 0.01)。③同一对比敏感度时,亮暗背景下两组视力无差异。表明无论亮暗环境在低对比敏感度下人工晶体眼的视力均低于正常眼,且对比敏感度越低差异越明显;环境亮度对视力的影响较对比敏感度低。

Comparison of contrast visual acuity between eyes implanted with artificial lenses and normal eyes under different background brightness

BACKGROUND:The comparison of contrast visual acuity between eyes implanted with artificial lenses and normal eyes is rarely reported.OBJECTIVE:To compare the contrast visual acuity under different background illuminations between eyes implanted with artificial lenses and normal eyes.METHODS:Twenty-five cases (41 eyes) that implanted with artificial lenses after cataract extraction were selected as experimental group and all the patients had the integrated follow-up data. Eighteen cases (31 eyes) of normal people were selected as control group that matched with the experimental group in age and gender. The best corrected distance LogMAR contrast visual acuity was measured at four contrast levels (100%, 25%, 10%, 5%) under two background illumination levels by multi-functional visual acuity tester.RESULTS AND CONCLUSION:①Under bright background: With the contrast visual acuity decline, the visual function in the two groups was reduced. There was no significant difference of LogMAR contrast visual acuity between two groups at 100%, 25% and 10% contrast levels (P > 0.05); at 5% contrast level, the LogMAR contrast visual acuity in the experimental group was lower than that in the control group (P < 0.05). ②Under dark background: With the contrast visual acuity decline, the visual function in the two groups was reduced. There was no significant difference of LogMAR contrast visual acuity between two groups at 100% and 25% contrast levels (P > 0.05). At 10% and 5% contrast levels, the LogMAR contrast visual acuity in the experimental group was lower than that in the control group (P < 0.05, P < 0.01). ③Under the same contrast level, there was no significant difference between two groups under bright background. These findings suggest that the contrast visual acuity of eyes implanted with artificial lenses is worse than that of normal eyes, especially at low contrast levels. The contrast visual acuity is affected much more by the contrast of visual target rather than background illuminations.