11 Mea
s
urement Procedure
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Instruction Manual Easyfield® (GA/15000/XXXX/EN 1219 Rev01)
11 Mea
s
urement Procedure
Caution
Risk of incorrect measurement due to incorrect use
Before first use: Let OCULUS or an authorized dealer train you in the
operation of the Easyfield®.
11.1 Preparing the Examination
11.1.1
Selecting the Examination program
Select the desired examination program from the "Program" tab panel.
☞
h
A description of how to write your own examination programs can be
found in the
User Guide
of the Easyfield® perimeter.
11.1.2
Determining the Required Correction
Correct measurement of the differential light sensitivity is only possible if
the individual test points are focused sharply on the retina. The patient
may need suitable corrective lenses for this purpose. It is possible to wear
contact lenses (not colored ones); in certain conditions the patient´s own
glasses may be used during the examination.
To determine the required correction the exact refraction of the eye that
is to be examined must be known. This can be taken either from a current
refraction measurement, or from the patient's present opthalmic lens
strengths (distance vision correction).
As a patient's accommodation capacity greatly decreases with age, an
age-related addition to the distance Rx is needed for patients aged
approx. 40 years and older. The following are guidelines for this:
Aged 40 - 50 years:
approx. +1.00 D addition
Aged 50 - 60 years:
approx. +2.00 Daddition
Aged oved 60 years:
approx. +3.00 D addition
