Dictionary of Biological Psychology
The two eyes tend to be asymmetrical in their function. One of the clearest examples of this, and one of the earliest discovered, is in a sighting task where an observer is required to point with a finger at a distant target.
Alternate closure of the eyes reveals that when viewed with one of the eyes, the finger and target will remain in alignment, whereas, by definition, this will not be the case with the other eye. The eye that is used for sighting in said to be the ‘dominant eye’. Many other tasks also show asymmetries where one eye is favoured or appears to control behaviour, such as conjugate saccadic EYE MOVEMENTS during READING, BINOCULAR RIVALRY, and VISUAL ACUITY. Different estimates of eye dominance do not perfectly correlate, and there are probably many different forms of the phenomenon.
DAVID W.HEELEY
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