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Q&A troubleshooting of DEC 200
A good image should have two characteristics:
1.
Positions
The macula and the optic disc are
horizontally aligned in the middle.
2.
High contrast
The macula, optic disc, and vessels are
all clear.
Optic disc
Macula
Vessels
If the above characteristics can’t be found in the shot, p
ossible failures might be the following:
The lens is too far away from
the examinee'
s eye.
4.Dark shadow on the bot-
tom of the image
The lens is much higher than
the visual axis.
The lens is too close to the
examinee's ey
e.
5.Line or spot within the
view
Eyelashes are in the light
path.
The lens is much lower than
the visual axis.
6.Blue or
white shadow on
the bottom of image
Cornea reŇection
of the image
of the image
2. White hot spot on the top
3. Dark shadow on the top
1. Small fundus image
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