Kowa VX-10a, Instruction Manual, Page: 46 / 64

6. Troubleshooting
T
roubleshooting
6
P6-3
Irregularity Check item Remedy
White dots appearing on
picture
Objective lens fouled with dust.
Clean the objective lens.
See “7-3 Inspecting/cleaning the objec-
tive lens.”
Objective lens fouled with, for instance,
tears rolling down from the examined
eye. Clean the objective lens.
See “7-3 Inspecting/cleaning the objec-
tive lens.”
Examined eye partly covered with its
eyelashes. Keep the examine eye’s eyelashes from
optically interfering with its pupil.
Shadow around peripheral
of picture
Camera too far from the examined eye.
Properly adjust the fundus camera’s
alignment.
Whitening around
peripheral of picture
Camera too close to the examined eye.
Properly adjust the fundus camera’s
alignment.
Locally darkening on
picture
Examined eye insufficiently dilated.
In case of mydriatic mode, set to small
pupil mode.
In case of non-mydriatic mode, check
the pupil for its diameter. If it should be
less than a specified value, shadow will
appear in the center of picture.
Dark spots appearing in
identical locations of any
picture
Inside of camera fouled with dust.
Please contact your Kowa dealer where
you purchased it, asking for recover.