HDC-9100 SERVICE MANUAL 17
④
Buttons for Visual Acuity Test
These buttons executes visual acuity test.
Button
function
Landolt Ring charts (0.03~2.0)
Alphabet Letter charts (0.03~2.0)
Number charts (0.03~2.0)
Snellen E charts (0.03~2.0)
Figures for children (0.1~1.0)
④
⑤
⑥
⑦
⑧
⑨
⑩
⑪