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目的 研究年龄老化因素对视功能的影响，揭示视功能的纵向变化规律。方法 运用视觉功能检侧仪追踪１３０ 名被试者５ａ前后的视功能。结果 ５ａ后，各组对比视力差异有显著性（Ｐ＜ ０．０５）；２个高年龄组的昏暗视力在５ａ 前后变化非常明显（Ｐ＜ ０．０１）；各年龄组的眩目恢复时间均随年龄的老化而显著延长（Ｐ＜ ０．０１ 或Ｐ＜ ０．０５）；随着年龄的增长，人眼的屈光度有由近视向远视变化的趋势。结论 纵向研究表明，４５ａ 左右是人眼视功能指标变化速率增大的转折点。
Objective To study the influence of aging factors on visual function and to reveal the longitudinal changes of visual function. Methods Visual function was used to track the visual function of 130 subjects before and after 5a. Results After 5 years, the visual acuity of each group was significantly different (P <0.05); the diminished visual acuity of two high age groups changed significantly before and after 5 years (P <0.01); the dizziness recovery time of each age group (P <0.01 or P <0.05). As the age increased, the refractive power of the human eye tended to change from myopia to hyperopia. Conclusion Longitudinal study shows that about 45a is a turning point in the rate of change of human visual function.