Qi Y
Department of Ophthalmology, Qingdao Municipal Hospital, China.
Yan Ke Xue Bao. 1993 Mar;9(1):12-4.
Ultrasonic biometry was done in 232 normal eyes and 138 eyes with primary angle closure glaucoma (ACG), using Ultrascan Digital B System IV (10 MHz). The ratio between the lens thickness and the axial length (lens thickness to axial length factor, LAF) was evaluated as a biometric index for assessing the eye with primary ACG in Chinese. LAF of 2.00 was found to be ideal point of demarcation between ACG and normal eyes (i.e., lens thickness equals to 1/5 of axial length). It appears that LAF is helpful in screening primary ACG eyes from eyes of the general population. This is similar to the anterior chamber depth of 2.5 mm which is recognized as a threshold for the occurrence of primary angle closure glaucoma.
使用Ultrascan数字B系统IV（10兆赫兹）对232只正常眼睛和138只原发性闭角型青光眼（ACG）眼睛进行了超声生物测量。在中国，晶状体厚度与眼轴长度之比（晶状体厚度与眼轴长度因子，LAF）被评估为评估原发性ACG眼睛的生物测量指标。发现LAF为2.00是ACG眼睛与正常眼睛之间的理想分界点（即晶状体厚度等于眼轴长度的1/5）。看来LAF有助于从普通人群的眼睛中筛查出原发性ACG眼睛。这与2.5毫米的前房深度类似，后者被认为是原发性闭角型青光眼发生的阈值。
