In Worth 4 Dot testing, seeing three green dots indicates suppression of which eye?

• A. OD suppression
• B. OS suppression
• C. Flat fusion
• D. Diplopia

Answer: (A)

Worth 4-Dot uses red-green glasses so each eye sees a different color on the test dots. The left eye (green filter) sees the green dots, and the right eye (red filter) sees the red dots. If the brain suppresses one eye, the dots from that eye aren’t perceived.

Seeing three green dots means only the green-dots from the green-filtered eye are being seen. That points to suppression of the other eye—the right eye (OD). In other words, the right eye isn’t contributing dots, so you’re perceiving the green dots from the left eye only.

If there were no suppression, you’d typically see a mix of red and green dots from both eyes; if suppression involved the left eye, you’d expect to see three red dots instead. Diplopia or flat fusion would produce different patterns of dots or misalignment rather than a single-color pattern.