仮性同色表の自動提示装置に関する研究2．TMC表による試み

Studies on automated display system for pseudoisochromatic plates. 2. Modified device for TMC plates

　仮性同色表の使用条件（Schmidt）は次のようである．①適正な照明．②十分な照明．③表を一定の角度で照らす．④表は視線に対して直角に．⑤視距離を一定に．⑥表提示時間を一定に．⑦常に全表を見せる．⑧表の提示順序を常に変える．

　しかし実際は相当にラフに使われている．そこで，上の条件を満たす器械を試作したが，1号機は表提示順序を変えられなかった．

　今回は2号機をTMC表を使って，順序も変えられるようにした．表の提示順序は，乱数によった．

　未熟な検者に使わせても十分検査できる．また記録も残せるので，後日の検討が可能である．

　今後はより簡便にして，安価な器械とすることが必要である．

We developed an automated display system for Stan-dard Pseudoisochromatic Plates Part 1 (SPP-1). This system satisfied the following requirements as stated by Schmidt : 1) neutral illumination, 2) sufficient luminan-ce, 3) no surface reflex from the plates, 4) 90° viewing angle, 5) display at a constant distance, 6) display for 2 or 3 seconds, 7) presentation of all the plates, except 8) possibility of random change of the order of the plates.

We developed a modified device that satisfies the condition (8) with the introduction of a microcomputor.

Six TMC (Tokyo Medical College) plates are attached to a rotary disk with a cover board in its front. One plate is exposed through the window of the board, 70 mm x 70 mm, while the shutter is open. The disk is made to rotate while the window is closed. The order of the plates can be randomly altered with this system. The response of the examinee is automatically printed. This modified system is expected to be of value for mass screening of color vision anomalies.

Rinsho Ganka (Jpn J Clin Ophthalmol) 40(8) : 882-884, 1986