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The Worth 4 Dot test is a common clinical test used to assess binocular vision and detect conditions such as suppression, fusion, and diplopia. Here's an explanation of its purpose and procedure:

Purpose
The Worth 4 Dot test is primarily used to:

Detect Suppression: Determine if one eye is being suppressed (ignored) by the brain to avoid double vision.
Assess Fusion: Evaluate the ability of both eyes to work together and fuse two images into one.
Identify Diplopia: Diagnose double vision and understand its nature (crossed or uncrossed).
Procedure
Preparation: The test is performed in a dimly lit room. The patient wears red-blue anaglyph glasses, with the red lens over one eye (typically the right) and the blue lens over the other (typically the left).

Interpretation of Results
Four Dots:

If the patient sees all four dots (one red, two blue, and one black dot), it indicates normal binocular vision with fusion.
Three Dots:

If the patient sees only three dots, it suggests suppression. The color of the dots seen indicates which eye is being used:
Red Dots Only: Suppression of the eye behind the red lens.
Blue Dots Only: Suppression of the eye behind the blue lens.
Two Dots:

Seeing only two dots indicates severe suppression or monocular vision.
Five Dots:

If the patient sees five dots, it indicates diplopia (double vision). The arrangement of the dots helps determine the type of diplopia (crossed or uncrossed).
The Worth 4 Dot test is a simple, yet effective way to assess binocular function and diagnose issues related to binocular vision.

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