Articles: PDF OnlyThe influence of cataract types on potential acuity meter resultsCarpel, Emmett F. M.D.a; Henderson, Victoria C.O.M.T. Author Information From the Department of Ophthalmology, Hennepin County Medical Center, and Group Health, Inc., Minneapolis, Minnesota. aReprint requests to Emmett F. Carpel, M.D., Department of Ophthalmology, Hennepin County Medical Center, 701 Park Avenue South, Minneapolis, Minnesota 55415. Journal of Cataract & Refractive Surgery 12(3):p 276-277, May 1986. | DOI: 10.1016/S0886-3350(86)80008-6 Buy Metrics Abstract The records of 100 patients who had cataract surgery were reviewed to compare preoperative potential acuity meter (PAM) results with postoperative visual acuity. A PAM acuity was obtainable in 95 patients. In 82 of the 95 patients (86%), the PAM levels were within three lines of the outcome. Potential acuity meter results substantially lower (≤ four Snellen lines) than outcome generally occurred when posterior subcapsular (PSC) or PSC plus diffuse cortical or nuclear changes were present. We believe that the PAM projection can usually go around or through the nuclear sclerosis to give an accurate prediction. However, with PSC or mixed type, one may not always find a window in the cataract. Also, PSC or diffuse cortical cataracts may be particularly disruptive to the paracentral diffracted light that is an important factor in PAM acuity. © Williams & Wilkins 1986. All Rights Reserved.