Kowa VX-10a, Instruction Manual, Page: 35 / 64

3. Basic photography
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Observation through the optical viewfinder
Perform fine adjustment while looking into the optical viewfinder. For better photography, be careful about
the following:
Photograph Quality of view Recommended remedy
White reflection at top Camera positioned too high.
White reflection at bottom
Camera positioned too low.
Eyelid of examined eye overhanging.
Instruct the patient to open the eyes.
Circular or line-shaped blur in white
Eyelash of examined eye overhanging. Or
the objective lens is not clean.
White reflection at left Camera positioned too leftward.
White reflection at right Camera positioned too rightward.
White flare in peripheral Camera is too close to examined eye.
Shadow in peripheral Camera is too far from examined eye.
Shadow in locals Examined eye insufficiently dilated.
Out of focus in general despite fine
focusing
• Too much tear wetting on the cornea of
examined eye, or the cornea is too dry.
Instruct the patient to blink a couple of
times.
• Incorrect optical viewfinder diopter.
Correct the optical viewfinder diopter
or use luminous spots for focusing
detection.
• Do not increase the amount of observation light and the amount of flash light more than required. Otherwise,
pain and/or injury may be inflicted on the patient.
• Be sure to use correct optical viewfinder diopter. If the diopter is incorrect, pictures will become out of focus.