The ability to distinguish which eye was stimulated by light.

The ability to distinguish which eye has been stimulated by light has been studied in normal and strabismic observers. This response characteristic is not uniformly present in the population, and skill at the task varies markedly among individuals. Scores range from high positive to chance. It is clear that the capability is greatest in the central retina, but not limited to that region. The nature of the sensation experienced by observers is quite unique. The prevalence and inheritance of this response attribute is but one of several interesting questions which need to be studied further.