Ocular Dominance - Are you left or right-eyed?

Ocular dominance, sometimes called eye dominance or eyedness, is the tendency to prefer visual input from one eye to the other. It is somewhat analogous to the laterality of right or left handedness, however the side of the dominant eye and the dominant hand do not always match.

Dominance does appear to change depending upon direction of gaze due to image size changes on the retinas.

[Here are some tests to determine it]

• The "Miles test". The observer extends both arms, brings both hands together to create a small opening, then with both eyes open views a distant object through the opening. The observer then alternates closing the eyes or slowly draws opening back to the head to determine which eye is viewing the object (i.e. the dominant eye).
• The "Porta test". The observer extends one arm, then with both eyes open aligns the thumb or index finger with a distant object. The observer then alternates closing the eyes or slowly draws the thumb/finger back to the head to determine which eye is viewing the object (i.e. the dominant eye) .
• The observer extends one arm, forms a small, circular opening with the thumb and index finger, then with both eyes open views a distant object through the opening. The observer then alternates closing the eyes or slowly draws the opening back to the head to determine which eye is viewing the object (i.e. the dominant eye).

More.