正常人黄斑区视觉细微矩阵图的研究

FINE MATRIX MAPPING OF THE MACULAR REGION IN NORMAL SUBJECTS

应用Ｈｕｍｐｈｒｅｙ视野分析仪和细微矩阵方法测定了１４例正常人，以中心凹为中心，１°空间间隔，由１００个位点构成的９°×９°矩阵的蓝光明视和暗视阈值，并应用此方法研究了屈光效应。结果表明，在明视情况下，黄斑区的平均敏感度改变小于１，０ｄＢ，而在暗视情况下，旁中心４°的敏感性较中心凹升高１５．０ｄＢ。由１．００Ｄ屈光度所致非聚焦效应使敏感度下降近１．２ｄＢ。此项技术对黄斑视功能测定提供了一种高空间分辨的敏感的方法。

Using a Humphrey field analyzer and fine matrix mapping,we measured photopic andscotopic thresholds for a blue light stimulus at 100 locations on a 9°by 9°matrix of 1°pacing centered atthe fovea in 14 normal subjects.Additionally,trial lenses were used to investigate the effect of refractiveerror. Under photopic conditions the mean sensitivity varied by less than 1 dB over this region. Underscotopic conditions the central values were reduced in sensitivity by 15 dB compared with those at 4°ec-centricity. Defocus showed less than 1.2 dB loss with 1.00D of refractive error under photopic condi-tion. The results reflect the properties of rod and cone photoreceptors and the effects of the rod mosaicnear the fovea. This technique is a sensitive test of macular visual function.