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5-12
Patient Testing
Patient Seating and Position
1. Confirm the Patient Visor is in the correct position so that the Patient Eyepiece is
aligned with the eye to be tested.
2. Hand the Patient Response button to the patient and check that the patient is relaxed.
3. Adjust the position of the patient or the instrument to obtain proper, comfortable
patient alignment. Proper alignment requires the patient to see all four self-alignment
points at the same time while fixating on the black square target in the center. These
are illustrated on pages 11-4, 11-5, and 11-6. It is OK if the fixation target appears
fuzzy to the patient.
4. If you are using the Chinrest Module, you can use the Chinrest height-adjustment
knobs. Inform the patient to put his/her chin in the blue-marked chinrest for the right
eye, or the white-marked chinrest for the left eye. See
5. Align the patient's head against the forehead rest by adjusting the table or seat height
for proper, comfortable head position relative to the instrument. Move the patient
toward the instrument if needed.
6. When Eye Monitoring is turned on, an image of the patient's eye is displayed on the
Testing screen. Keep the patient's pupil inside the circle on the video image
throughout the test. Keeping the pupil perfectly centered for proper alignment is not
necessary, but it should stay within the circle.
A very important factor affecting test reliability is the steadiness of the patient fixation.
Unless the tested eye accurately fixates on the target while responding to stimuli, there is a
possibility of unreliable results.
A comfortable patient position with good fixation is more important than obtaining or
keeping exactly centered alignment.
Explaining the Test Procedure to the Patient
Explain the test procedure to the patient as follows:
"The instrument is going to show you some patterns that flicker, or shimmer, or are striped.
Each time you see one of these patterns, press (and release) the button you have in your
hand. Please place and keep your forehead on the instrument forehead rest."
"Can you see the black spot in the center of the screen? You must keep looking at the black
spot in the center at all times during the test."
"While looking at the black spot in the center, can you see all four triangles at the edge of
the screen?"
"Are you comfortable?"
"A sample of the test is now running. Please press the button whenever you see a pattern
that flickers, or shimmers, or is striped. You may pause the test by holding down the
button. Releasing the button resumes the test. You may blink your eyes whenever you
want. A good time to blink is whenever you press the button."
During testing, the stimulus may be more difficult to see than as shown in the pre-test demo.
Humphrey Matrix User Manual
Chinrest Module
on page 1-8.
2660021138935 Rev. F 2015-11
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