Li R W, Edwards M H, Brown B
Department of Optometry and Radiography, The Hong Kong Polytechnic University, Hung Hom, Hong Kong, Hong Kong.
Vision Res. 2000;40(27):3775-81. doi: 10.1016/s0042-6989(00)00212-1.
Many visual functions deteriorate with increasing age, vernier acuity apparently being an exception. We used an improved experimental protocol to investigate vernier thresholds in subjects in four age groups. Vernier threshold was found to increase with increasing age, and the difference in this, compared with previous findings is probably due to the smaller inter-pixel angle used. Vernier acuities in young subjects in other studies seem to have been underestimated. As vernier acuity did not vary with retinal illuminance and the sensitivity loss does not seem to be a learning effect, neural rather than optical changes are likely to account for the deterioration. Measurement of vernier acuity may have clinical application in the determination of visual function behind cataract, and it will be necessary to consider the effect of age on vernier acuity.
许多视觉功能会随着年龄的增长而衰退，游标视力显然是个例外。我们采用了一种改进的实验方案来研究四个年龄组受试者的游标阈值。结果发现，游标阈值会随着年龄的增长而增加，与之前的研究结果相比，这种差异可能是由于所使用的像素间角度较小。其他研究中年轻受试者的游标视力似乎被低估了。由于游标视力不随视网膜照度变化，且敏感性损失似乎不是学习效应，因此神经而非光学变化可能是导致衰退的原因。游标视力的测量在白内障背后视觉功能的测定中可能具有临床应用价值，并且有必要考虑年龄对游标视力的影响。
