多焦点眼内レンズ挿入眼の視力と年齢

Age and visual outcome following multifocal intraocular lens insertion

　1992年4月から1994年4月の期間に，回折型多焦点眼内レンズを挿入した27例38眼における術後視力を，65歳未満の低年齢群と65歳以上の高年齢群の2群に分けて検討した。術前または術後に白内障以外の眼疾患を認めた症例は除外した。遠見矯正視力1.0以上の眼数は低年齢群で93％，高年齢群で40％，遠見矯正下での近見視力0.8以上の眼数は，低年齢群で89％，高年齢群で20％であり，どちらも有意差があった。また，同一眼の遠見視力と近見視力の対数値の差をみると，低年齢群の0.13±0.12に対して高年齢群は0.67±0.65で，後者が有意に大きく，65歳以上の患者では，遠見視力以上に近見視力が出にくいということが分かった。

We evaluated the visual outcome in 38 eyes in 27 patients who underwent cataract surgery with multifocal intraocular lens .insertion during a 25-month period. They were divided into two groups: those less than 65 years and those aged 65 years or over. Cases were excluded who manifested eye lesions other than cataract. Corrected far visual acuity of 1.0 was achieved in 93% in the younger age group and in 40% in the elder group. Near visual acuity of 0.8 with correction for distance was achieved in 89% in the younger age group and in 20% in the elder group. These differences were significant. We also calculated the logarithmic difference between distant and near visual acuity in each eye. The value averaged 0.13±0.12 for the younger group and 0.67±0.65 for the elder one. The difference was significant. The findings show that near vision tended to be poorer in elder patients than in younger ones. Good near vision was also more difficult to attain than distant vision in elder patients.