Canon CR-2 - Manual (Page 41)

7 Troubleshooting
41
Symptom Cause and remedy
The split lines do not align.
The diopter patient's eye is outside the range of –10 to +15 D.
Use the diopter compensation function, turn the focus ring, and
focus on the position where the images of the retina look clear
at the same time.
Cannot capture good images.
The patient's pupil is not dilated enough. Dilate the patient’s
pupil. If the pupil is still too small, enable the small pupil
photography function.
The retinal camera and the eye are not aligned. Align them
correctly.
Focus the image.
Eyebrows or eyelashes are blocking the pupil. Instruct the
patient to open his/her eye wider.
The patient's eye is cloudy. Clear images cannot be captured if
this is the case.
Adjust the flash intensity, patient's diopter, and small pupil
photography function.
The objective lens is dirty. Clean the objective lens (see page 35).
The patient is wearing contact lenses. Instruct the patient to
remove his/her contact lenses.
Black spots or any artifacts
appear in the same place in every
captured image.
There is dirt or dust on the objective lens. Clean the objective
lens (see page 35).
Dirt or dust is stuck to the imaging sensor of the digital camera.
Use the self-cleaning sensor unit to clean it. (see page 36).
White spots are visible on the
captured image.
The objective lens is dirty. Clean the objective lens (see page 35).
The patient's eyelashes are interfering with the image. Instruct
the patient to open his/her eye wider, and capture another
image.