50charts and various masks Landolt, Letter, Child, Snellen, 50 kinds of charts, and Horizontal line, Vertical line, one chart, various masks can be selected by the remote control box. Fast, slient chart disk rotation It moves to the following chart in a maximum of 0.3 seconds. User Program mode 2 kinds of programs can be selected. 48 kinds (maximum) of chart and mask are memorizable. Room light swicth By using optional deviator, operation of a room light is available by the remote control. Adjustment of the brightness The brightness of the projector can be changeable by the control switch according to the brightness of the operation room.