User's Manual

--------------------------------------------------------------------------------------------------------------------- CDC-1 User Manual

11.5. Visual acuity test results in overcorrection or undercorrection

① The test distance could be changed. Measure the test distance and adjust it to within the specification of this

device.

11.6. Red/Green test is overcorrection or undercorrection

① When it is possible to adjust the brightness of inspection room. Adjust it properly.

② Check the wavelength balance of red/green chart. The ambient illumination may affect the test result. In

setup menu adjust the red/green balance.

11.7. Red/Green filter is not filtering completely

① When Red/Green chart color doesn’t match with the Red/Green filter glass, the opposite color may be seen.

Please in setup menu adjust Red/Green color

11.8. Polarizer test is not working

① If a patient is not in the front of the device or stand aside, polarized filter might be less effective. Please check

patient’s position