PAM stands for "potential acuity meter." It is an instrument used to examine the eyes. Your doctor can use this tool to predict how well you may see after eye surgery.
Potential acuity meter
Linda J. Vorvick, MD, Medical Director, MEDEX Northwest Division of Physician Assistant Studies, University of Washington, School of Medicine. Also reviewed by David Zieve, MD, MHA, Medical Director, A.D.A.M., Inc.