PDR-7000 Operation Manual
4.5.11 Worth test
Use: To detect fusion and suppression
Chart: Worth
Auxiliary lens: Red filter on the right eye and green filter on the left eye
Ideal appearance:
Right eye Left eye Binocular ideal
1. Present the worth chart.
Press
The red filter is placed in the right measuring window and the green one is placed in
the left measuring window.
2. Ask the patient, “How many bright spots can you see? What colors are they?”
Appearance of chart Symptom Correction
1) Four spots
Fushion
: Red, : Green, ●: Pink or Red/Green alternately
However, when the patient has an obvious
dominant eye,
Right dominant eye →●: Red
Left dominant eye → ●: Green
2) Three spots
Right eye
supression
The two green and ● are seen.
3) Two spots
Left eye
supression
The red and are ● seen.
4) Five spots at the same
time
Diplopia
The red and green are seen at
the same time.
5) Five spots
2) and 3) blink alternately.
Alternate
supression
The red and green blink alternately.
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