Worth 4 Dot Test

The Worth 4 dot test provides a quick way of establishing if a patient is suppressing one eye.

The patient views the screen through the red / green filters and is asked “how many dots can you see"?

Worth 4 dot test

The black dot will be seen by both eyes, the “green” dots will be seen by the right eye only and the red dot will be seen by the left eye only.

Therefore, if the patient is binocular, they will see 4 dots. If they are suppressing the right eye they will see 2 dots, if they are suppressing the left eye they will see 3 dots