PAMPotential acuity meter
PAM stands for "potential acuity meter." It is an instrument used to examine the eyes. Your health care provider can use this tool to predict how well you may see after eye surgery. People who have reduced vision due to cataracts may also have other reasons for poor vision. The PAM will help predict what the vision will be after the cataracts are removed. If cataracts are severe, the PAM may not give useful information.
Litoff D. Minimal visual loss: determining the role of the cornea. In: Mannis MJ, Holland EJ, eds. Cornea: Fundamentals, Diagnosis, and Management. 4th ed. Philadelphia, PA: Elsevier; 2017:chap 24.
Stein HA, Stein RM, Freeman MI. Preliminary examination. In: Stein HA, Stein RM, Freeman MI, eds. The Ophthalmic Assistant: A Text for Allied and Associated Ophthalmic Personnel. 9th ed. Philadelphia, PA: Elsevier Saunders; 2013:chap 8.
Normal vision - illustration
Normal vision occurs when light is focused directly on the retina rather than in front or behind it.
Review Date: 10/8/2017
Reviewed By: Linda J. Vorvick, MD, Clinical Associate Professor, Department of Family Medicine, UW Medicine, School of Medicine, University of Washington, Seattle, WA. Also reviewed by David Zieve, MD, MHA, Medical Director, Brenda Conaway, Editorial Director, and the A.D.A.M. Editorial team.