This document describes the Worth four-dot test procedure used to differentiate between binocular single vision (BSV), alternating or harmonious anomalous retinal correspondence (ARC), and various types of suppression. The test involves having the patient view four lights - one red, two green, and one white - through differently colored lenses placed in front of each eye. The number and color of lights seen by the patient can indicate whether they have BSV, ARC, or left, right, alternating, or diplopia suppression. The results must be interpreted in the context of any manifest strabismus present at the time of testing.

2. WORTH FOUR-DOT TEST
 THIS IS A DISSOCIATION TEST WHICH CAN BE USED WITH BOTH
DISTANCE & NEAR FIXATION, AND DIFFERENTIATES BETWEEN BSV OR
ARC AND SUPPRESSION.
 RESULTS CAN ONLY BE INTERPRETED IF THE PRESENCE OR ABSENCE
OF A MANIFEST SQUINT IS KNOWN AT TIME OF TESTING.

3. PROCEDURE
The patient wears a green lens in front of the left eye & red lens in front of the right eye.
Then the patient views a box with four lights; one red, two green, and one white
RESULTS:
If BSV is present all four lights are seen.
If all four lights are seen in the presence of a manifest deviation, harmonious ARC is present.
If two red light are seen, left suppression is present.
If three green lights are seen, right suppression is present.
If two red & three green lights are seen, diplopia is present
If the green & red lights alternate, alternating suppression is present.

4. LETS GO FOR PICTURE

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