With the Maddox rod oriented vertically over the right eye, and the red line seen above the light source, this indicates which deviation?

• A. Left hyperdeviation
• B. Right hyperdeviation
• C. Exophoria
• D. Esophoria

Answer: (A)

The Maddox rod turns a point light into a line when oriented in a given meridian, and the relative position of that line to the light reveals vertical misalignment between the eyes. With the rod held vertically over the right eye, the line you see is horizontal, and whether that line sits above or below the light tells you which eye is higher.

If the line appears above the light, it means the left eye is higher (hyperdeviated) relative to the right eye. So this pattern indicates a left hyperdeviation. Horizontal deviations (exophoria/esophoria) aren’t indicated by this vertical-rod setup.