Clinical study for postoperative visual acuity in cataract patients with the potential acuity meter

Objective To study a new domestic potential acuity meter(PAM)for predicting visual acuity(PVA)in patients with cataracts and to compare the results to that measured by PAM-1000 and Lotmar.Methods One hundred and fifty cataract eyes were enrolled in this study. PVA was evaluated with three difierent dioptometers before the surgery and compared to actual best corrected visual acuity (BCVA)obtained two months after the surgery. Results PVA obtained from domestic PAM correlated well with BCVA.In 56 eyes witll non-identical resuhs between PVA and BCVA,52 eyes were false-negative and 3 eyes were false-positive,indicating that PAM tended to underestimate postoperative BCVA.In severe cataract patients,the correlation between PVA obtained from these three dioptometers and postoperative BCVA was decreased. The identical rates(as compared with postoperative BCVA)for the results obtained from PAM-1000 and Lotmar were 64.0%and 62.7%,respectively.Conciusions Domestic PAM is relatively reliable for predicting postoperative visual acuity. It is a valuable metllod in the examination of PVA before the cataract surgery. Key words: Vision; Cataract; Cataract extraction; Refraction,ocular