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Biomedical subjects

S L Severin

Publications and source records attributed to S L Severin.

4 recordsLinked to original sources
PubMed1988

A clinical evaluation of the potential acuity meter in 210 cases.

The potential acuity meter (PAM) has been reported to be a useful instrument for predicting postoperative visual acuity after cataract extraction surgery. In this study, 210 eyes were tested with the PAM before surgery, and the best postoperative visual acuity was obtained. The PAM accurately predicted the postoperative visual acuity to within three lines in 85.2% of the cases. Further, the PAM was able to predict whether or not an operation would be successful (success defined as a final visual acuity of 20/40 or better) in 91.6% of the cases. It was found that senile macular degeneration may cause false-positive tests (predicted acuity better than final acuity), and this should be watched for when the test is used. When the test is in error, the tendency is for the PAM to underestimate the final acuity rather than to overestimate.

Cataract Extraction↗
PubMed1988

Pseudophakic cystoid macular edema: a revised comparison of the incidence with intracapsular and extracapsular cataract extraction.

A previous study by one of the authors found no significant difference in the incidence of cystoid macular edema with an intracapsular cataract extraction and the implantation of an iris-supported posterior chamber optic lens, compared with the incidence of cystoid macular edema with an extracapsular extraction and the implantation of a Shearing lens. To test the validity of that conclusion, the charts of 686 patients operated on by one of the authors were reviewed. It was determined that the incidence of both transient and persistent cystoid macular edema was significantly higher in patients who had an intracapsular cataract extraction. Reasons for the contradictory findings are discussed.

Cataract Extraction↗