レーザー暗点による視野検査法

Laser scotometry and perimetry

　眼底レーザー光凝固の要領でGoldmann三面鏡を通して，指標の補助レーザー光線を眼底に投影して，網膜上で暗点を検出した．

（1）網膜面での光点の明るさは，普通使用する光線強度で既に視野計視標に較べてはるかに強力である．したがって，浮腫，滲出や出血を伴う黄斑部疾患などで，潜在的の機能回復能力が把握できる．

（2）透光体混濁で眼底検査，視野検査の困難な症例でも暗点，視野欠損を検出しうる．

（3）耳側囲辺の病巣など視野計でとらえられない視野欠損も発見できる．

（4）適切な微弱光線を使用すれば比較暗点も検出される．

（5）眼底レーザー凝固施行の際に併用して有益である．

A new method is described with which the retinal sensitivity is measured by projecting the aiming beam of an argon or krypton laser photocoagulator through a 3-mirror contact lens. The projectedaiming beam is far brighter at the retinal level than the light target at maximum intensity in an ordinary perimeter or scotometer. The discrepancy in measured scotoma by laser and ordinary peri-metry or scotometry suggests the probable recov-ering potential of the visual function. This laser examination can be performed even in the presence of slight opacity of the media, where ophthalmo-scopy or perimetry is not possible. Relative scoto-mata can be detected by setting the laser beam at an adequately low intensity. Visual field defects in the extreme nasal periphery, which cannot be tested by conventional perimeter, can also be detected. The present method appears to be of particular value when used during laser photoco-agulation.