166 Digital Refractor CDR-9000
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Objective: To find suppression during the subjective test. It is possible to che
ck the internal or external phoria.
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Chart: Worth-4-Dots chart
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Auxiliary Lens: Red Filter (right), Green Filter (left)
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Expectation: To check how many dots can be seen. Normally, 4 points are se
en.
1. To enter this mode, press the Worth-4-Dots Chat. Alternately, press the [TE
ST] button and then select “Worth 4 Dot” Item of the touch screen to exe
cute this test.
2. Ask the patient how many bright points can be seen and what color is th
e lower circle.
- If the patient sees 4 points, it means normal fusion. If the lower circle
appears to be red, then the right eye is dominant and if green, left.
- If the patient only sees 3 points, the right eye is suppressed, she/he ca
nnot see the upper rhombus shape.
- If the patient only sees 2 points, the left eye is suppressed, she/he can
not see the cross shape.
- If the patient sees 5 points, the patient has phoria. If the red diamond
shape is at the left side, external phoria, otherwise, internal phoria.
- If the patient sees 5 points and the three and the two flickers alternate
ly, the right and left eyes are alternately suppressed.
Perform phoria tests if the patient has phoria explicitly.
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