Potential acuity meterによる白内障術後視力の予測について

Prediction of visual acuity after surgery for cataract using potential acuity meter

　白内障眼の術後視力を予測するのに，術前にpotential acuity meter （PAM）による視力を測定し，レチノメーターによる干渉縞視力の測定値と比較し，以下の結論をえた．

（1）混濁が強く瀰漫性である成熟白内障においては，PAMはレチノメーターに比べ，測定困難な場合が多かった．

（2）混濁の比較的軽度な白内障では，PAMの測定値はレチノメーターの測定値に比べ，術後視力との相関が高く，より精度の高い予測が可能であった．

The probable visual acuity after cataract surgery can be estimated, presurgically, with the use of laser interferometer (Retinometer) or of potential acuity meter (PAM) which projects various opto-types onto the fundus. We evaluated a series of 66 eyes operated for cataract. We compared the pre-dicted visual acuity levels measured by laser interfero-meter and PAM with the actual postsurgical visual acuity measured with Landolt rings.

Out of the present series of 66 eyes, presurgical estimation of visual acuity was possible in 34 eyes by laser interferometer and in 30 eyes by PAM. A total of 39 eyes could be evaluated by either of the methods. PAM measurement was more difficult to perform in denser and more diffuse opacity as in mature cataract. The predicted visual acuity showed higher correlation with the actual postsurgical one when measured by PAM than laser interferometer.