A comparison of the potential acuity meter (PAM) and the illuminated near card (INC) in patients undergoing phacoemulsification.

Published

Journal Article

PURPOSE: To compare the accuracy of the potential acuity meter (PAM) and the illuminated near card (INC) in patients undergoing phacoemulsification. METHODS: During presurgical evaluations, both PAM and INC were tested on each study patient following dilation. Patients then rated the subjective ease of use of each test. Best spectacle-corrected visual acuity (BSCVA) was recorded at 4 and 12 weeks postoperatively. McNemar's chi(2) test for paired associations was used to analyse categorical data; paired t-tests were used for continuous variables. RESULTS: Overall, the INC was more likely than the PAM to predict BSCVA within one Snellen line (P=0.002), but this difference decreased for accuracy within two lines. The PAM predicted BSCVA within one line in 87 (70.7%) eyes, as compared to 102 (82.9%) eyes by the INC. The PAM was accurate within two lines in 109 (88.6%) eyes; the INC was accurate in 115 (93.5%) eyes. The PAM was more likely to underpredict potential acuity (P<0.001), while the INC was more likely to overpredict (P=0.004) or give exact predictions of BSCVA (P<0.001). Accuracy of the INC declined in eyes with macular comorbidity. The PAM and INC were rated as 'easy' tests by 54 (45.4%) and 93 (78.2%) patients, respectively. CONCLUSIONS: Both the PAM and the INC were useful for predicting BSCVA after phacoemulsification, but the PAM was more likely to underestimate potential acuity. The INC was easier for patients to use, and had better accuracy than the PAM in patients without macular comorbidity, but was more likely to overestimate potential acuity.

Full Text

Cited Authors

  • Chang, MA; Airiani, S; Miele, D; Braunstein, RE

Published Date

  • December 2006

Published In

Volume / Issue

  • 20 / 12

Start / End Page

  • 1345 - 1351

PubMed ID

  • 16179931

Pubmed Central ID

  • 16179931

Electronic International Standard Serial Number (EISSN)

  • 1476-5454

International Standard Serial Number (ISSN)

  • 0950-222X

Digital Object Identifier (DOI)

  • 10.1038/sj.eye.6702106

Language

  • eng