Zeiss VISUREF 150, User Manual

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8
Intended use
The ZEISS VISUREF 150 Autorefractor/Keratometer is a diagnostic device
used to determine the objective refractive values and keratometric
characteristics of the human eye. The results are used to assist the process of
prescribing optical aids such as eyeglasses and contact lenses.

Measurement errors may occur when using the device on patients
in the following categories:
•
Patients who are unable to steadily fixate the fixation image with
the eye under examination (e.g. in the case of nystagmus,
extremely poor visual acuity, lack of concentration).
•
Patients who are unable to follow the instructions of the user.
•
Patients who are unable to sit upright in front of the device.
•
Patients who have forehead or chin injuries that prevent the
head from being supported on the forehead/chin rest
•
Patients whose eyes exhibit an optical media transparency that
is too low for refraction measurements (such as cataract with
dense lens clouding).
•
Patients whose eyes have an insufficient corneal reflection for
keratometry or refraction measurements (e.g. due to distortion
of the tear film, corneal scarring or caustic burns of the cornea).
•
Patients with significantly changed cornea (e.g. keratoconus).
•
Patients whose pupil opening is too small (< 2 mm) for refraction
measurements.
•
Patients whose closed or partially closed palpebral fissure causes
complete or partial obstruction of the pupil.
•
Patients with morphological changes of the retinal anatomy in
the region of the fovea for refraction measurements (e.g. retinal
detachment, edema, ulcer).