在原发性闭角青光眼中,其早期以眼前部为主,如前房浅、虹膜根部膨隆、前房角窄等;当瞳孔轻度散大时,则往往导致瞳孔阻滞、房角闭锁而眼压升高。因之,目前在青光眼的普查或早期诊断中,多主张除询问病史外,主要依靠前房角镜检查配合激发试验来协助早期诊断。但是这些检查不但操作繁锁,而且还需要特殊设备,特别是在大量普查工作中,更难于实施。因之使闭角青光眼的早期发现受到一定的限制。由临床实践得知,前房角的宽窄与前房的深度密切相关。因而近年来有应用裂隙灯检查测定周边前房深度以估量前房角 In primary angle-closure glaucoma, its early anterior eye-based, such as shallow anterior chamber, iris root bulging, narrow anterior chamber angle; when the pupil is slightly scattered, it often leads to pupil block, angle atresia IOP increased. Therefore, at present in the census or early diagnosis of glaucoma, many advocates in addition to asking history, mainly rely on gonioscopy with provocation test to assist in the early diagnosis. However, these inspections are not only cumbersome to operate, they also require special equipment and, in particular, are more difficult to implement in a large number of census work. Therefore, the early detection of closed angle glaucoma is subject to certain restrictions. From clinical practice that the width and width of the anterior chamber angle is closely related to the depth of the anterior chamber. In recent years, therefore, the use of slit lamp examination to determine the depth of the surrounding anterior chamber to assess the anterior chamber angle