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I When correct measured values are not obtained
If a patient has drooping eyelashes, ask the patient to please open his or her eyes wider.
If
necessary, have the patient or an assistant gently lift the eyelid with their fingertip.
■ When you approach the patient to be focusing the patient' s eye, you pay attention to look which a
patient has drooping eyelashes.
• Blinking during the measurement may cause the measurement to fail on be inaccurate.
The measurement may not be made if the patient is suffering from an eye disease such as a
cataract, retinal detachment, opaque condition of the cornea, crystalline lens, vitreous body or other.
When the pupil is smaller than
2.9 mm, the measurement will fail, or correct values will not be obtained
even if the measurement process is successfully made.
When <S+C> is stronger than -18D~+22D, or when <C> is stronger than -SD'+SD, measurement
cannot be made because these values are beyond the measurement range.
Set the axis of the mesuring unit and the mesurement eye, or the cylindrical axis of the mesurement
result do not equal with the acutiality value.
• When you bring the mesuring unit, set your armpit with your body.
Other
• Measurement with a contact lens on:
Measurement is possible. However, if the contact lens is not properly fitted, the correct values may
not be obtained.
Any contamination or damage to the contact lens surface may result in a
measurement failure.
- Measurement with eye glasses on;
Measurement will be possible if the lens is at a slight incline.
Howecer, if the lens is at a large
incline, the correct values will not be obtained.
If light is reflected from the lens surface into the
measuring window, or if the glasses have a colored lens with a low light transmission, the
measurement may fail.
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