筒井式他覚的視力測定装置の臨床評価

Objective visual acuity estimation by optikinetic nystagmus inhibition test

　視運動性眼振抑制法による筒井式他覚的視力測定装置を用い，正常者27名及び視力障害者30名を対象に視力測定を行い，ランドルト環による5m自覚視力と比較，検討した。

　正常人については，5m自覚視力と90cm他覚視力は相関係数0.95と良い相関を示した。また，斜視，視神経疾患，網膜疾患等の患者で視力障害を有する症例でも自覚視力と他覚視力は良い相関を示し，とくに心因性視力障害者では6例中4例で他覚視力が自覚視力を上回った。

　本装置は，中心暗点のあるもの，眼球運動障害のあるものには応用できないが，他覚的視力測定法として簡便で，精度が高く，臨床上も有用であると思われた。

We evaluated the objective visual acuity test devised by Tsutsui incorportating the optokinetic nystagmus inhibition test. The test was applied to 27 normal subjects and 30 patients with eye dis-orders. The thus recorded visual acuity values were compared with visual acuity by Landolt rings.

The objective visual acuity was highly correlated with the subjective visual acuity at the correlationcoefficient of 0.95. The objective visual acuity was fairly correlated with ten subjective visual acuity in patients with amblyopia, optic neuritis or retinal detachment. Objective visual acuity was better than subjective one in 4 out of 6 cases with visual distur-bance due to psychosomatic disorders.

The objective visual acuity test of Tsutsui thus seemed to be of value because of its reliability and relative simplicity.