摘要
过去,人们认为青光眼性视神经和视野损害发展到相当程度,中心视功能仍未受累。最近研究发现,黄斑区X 型和Y 型节细胞轴突的轴浆流最易受到眼压升高的影响而发生阻滞,进而发生结构和功能损害。但由于两种视细胞彼此排列紧密、代偿功能强,应用Snellen 视力表不能查出早期青光眼中心视功能轻微异常变化。
Thc foveal light threshold 108 of normal eyes were measured withthe Humphrey Field Analyzr.No significant difference was foundbetween the male and female and between the right and l(?)ft eye.Thereis great significant difference between the group aged<60 years and thegroup aged≥60 years.Th mean value of the foveal light threshold inth group aged<60 years is 36.91+1.66dB,and that in the group aged≥60 years is 35.68+1.16dB.The factors corr,lated to thd foveal thresh-old are the age,the falsengative,question asked and the mean lightsensitivity of any region in the central field.
