Test Parameters and Strategies
Humphrey Field Analyzer II-
i
series User Manual 2660021145640 A
4-6
Test Mode Age Corrected A hill of vision is assigned to the patient based on the patient’s age. The
expected threshold at the hill’s peak, the fovea, is called the central
reference level. This central decibel value is indicated on the test screen
and the printout.
You must enter the patient’s date of birth prior to beginning the test. You
may
use Age-Corrected mode only with standard stimulus size and color
(Size III, White). If you select non-standard size and color parameters with
Age Corrected Screening, the instrument will default back to the Threshold
Related Test Mode upon leaving the Change Parameter Screen.
Threshold Related A hill of vision is assigned only after thr
eshold values for 4 primary points
are determined. The calculated threshold at the hill’s peak, or fovea, is
called the central reference level. This value appears on the test screen and
the printout.
Single Intensity The HFA uses a default intensity level of 10 dB
to test the entire visual field.
If you desire a different intensity, press CLEAR and enter the desired value
on the keypad which appears. Press ENTER. The single intensity value will
appear on the test screen (as Stim:) and on the printout as “Stimulus
Intensity.”
You may set the Single Intensity levels only in even increments.
Stimulus Size I, II, III, IV, V Five stimulus sizes (diameters) are available on most instrument models.
They range from Size I (smallest) to Size V (largest). Model 720
i
only has
the Size III stimulus available for testing.
Stimulus Color White White stimulus projected onto white bowl background.
Red Red stimulus projected onto white bowl background.
Blue Blue stimulus projected onto white bowl background.
Table 4.1 Screening Test Parameters
(Factory default parameter settings appear in bold print.)
Screening
Parameters
Parameter
Settings
Description
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