During the Worth four dot test with a red filter over the right eye and a green filter over the left, a patient reports seeing two red lights. This response indicates:

• A Uncrossed diplopia
• B Suppression of the right eye
• C Normal binocular single vision
• D Suppression of the left eye ✓

Explanation

With the standard arrangement the right eye sees the two red dots and the white dot through the red filter, while the left eye sees the three green dots. Seeing only two red lights means all green input is being ignored, which is suppression of the left eye. Seeing only three green lights means right eye suppression. Five lights indicate diplopia, and four lights indicate fusion or harmonious anomalous retinal correspondence depending on testing distance.

Reference: Khurana Comprehensive Ophthalmology, 7th ed.

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Written and medically reviewed by the StethoPrep medical team.