眼底測定値の誤差について

On the accuracy in the measurement of the retinal blood vessels

　凡そ実験的研究方法の特色とするところは，問題の現象に関与する諸量の大さを適当な器械を用いて定量的に測定するにあるものであるが，測定に当つて器械で読み取つた数値は観測者が判断によつて定めた数であるから常に多少の誤差を伴つている。

　私共はGullstrand簡易大検眼鏡に三国式眼底測微計を装置して眼底計測を行つた時の誤差に就き考究してみたので以下に簡単に記載する。

Some factors which had influenced on the accuracy in the measurement of the caliber of retinal blood vessels by Mikuni's eye-piece attached to the large simplified Gullstrand's ophthalmoscope were investigated. Following results were obtained.

1) The error proper to the Mikuni's eye-piece was under 0.0017mm for the caliber of retinal artery in normal subject. The value represented in percentage was under 1.63% of the caliber of the normal retinal artery. These values being very small, were considered to have little influence upon the measured values.