Application guidelines for Reference Image measurement
000000-1865-713-GA-en-US-080622
The palpebral aperture is not large enough
The following information refers primarily to characteristics of the
patient's eye.
It may be difficult for some patients to open the eye sufficiently wide.
Palpebral apertures which are too small prevent accurate detection of vessels
near the limbus.
Fig. 15 Palpebral aperture is too small and prevents detection of vessels near limbus
Error message: "Ask patient to blink and open the eye wider."
The area in which vessels near the limbus can be detected may be too small.
Accurate detection of vessels near the limbus is not possible.
Encourage the patient to open his/her eye as wide as possible. Try to
support opening of the eye with a finger by slightly pulling the area of the
eyebrows and upper eyelids, but without applying any pressure to the
eyeball, while operating the device with the other hand. The upper and
lower eyelid edge must be outside the palpebral aperture template.
Fault
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