Asbell P A, Chiang B, Amin A, Podos S M
Ophthalmology. 1985 Jun;92(6):764-7. doi: 10.1016/s0161-6420(85)33960-x.
The potential acuity meter (PAM) is designed to evaluate retinal acuity in the presence of media opacities. We looked at patients with glaucoma but with clear media, and compared best corrected visual acuity with PAM results to see if they produced comparable results. Sixty eyes in 38 glaucoma patients and 20 eyes in 10 normal ocular patients were evaluated. Our results indicate that PAM visual acuity is a reliable indicator of Snellen visual acuity in normal eyes, in eyes with mild to moderate glaucomatous damage, and when PAM visual acuity measurements were better than 20/60. However, when visual field loss is severe and when PAM visual acuity readings were worse than 20/60, the correspondence between these and Snellen visual acuity was erratic. Poor PAM results will not correlate with postoperative visual acuity in patients with advanced glaucoma and cataracts.
潜在视力计（PAM）旨在评估存在介质混浊时的视网膜视力。我们观察了患有青光眼但介质清晰的患者，将最佳矫正视力与PAM结果进行比较，以查看它们是否产生可比的结果。对38例青光眼患者的60只眼和10例正常眼患者的20只眼进行了评估。我们的结果表明，在正常眼睛、轻度至中度青光眼损伤的眼睛以及PAM视力测量结果优于20/60时，PAM视力是Snellen视力的可靠指标。然而，当视野缺损严重且PAM视力读数低于20/60时，这些与Snellen视力之间的对应关系不稳定。对于晚期青光眼和白内障患者，PAM结果不佳与术后视力无关。
