Biomedical subjects
Publications and source records attributed to S Coren.
Multivariate techniques were used to explore the relationship between ocular dominance and asymmetries in visual acuity or acuity dominance. The convergence distance under which the acuity testing takes place was found to affect the relationship between these two variables.
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Ocular dominance, as measured in sighting tests, involves a temporary suppression of the input from the non-dominant eye in order to avoid diplopia. Amblyopia ex anopsia may be viewed as a long term suppression of the input from one eye for the same reason. In the absence of anisometropia, paralysis of extra ocular muscles, or other factors which would tend to determine which eye would manifest suppression, the non-dominant sighting eye should be more likely to develop amblyopia given the presence of strabismus. A sample of 258 amblyopes supports this prediction based on the population norms for sighting dominance.
Recent suggestsions linking suppression observed in amblyopia ex anopsia with that manifested in normal ocular dominance coordinations were experimentally tested. Training procedures which normally alleviate functional amblyopic suppression were shown to have similar results in alleviating the suppression of the nondominant eye in visually normal observers. Methodological and theoretical implications of these results are discussed.
The laterality of eye and limb do not appear to be generally correlated as measured in 160 observers using a graded index. Sex differences emerge indicating more consistent eye and limb preferences as well as stronger eye dominance scores in male subjects. In addtiion, better consistency is found for right-eye dominants than for left. This pattern of results permits some inferences to be made about the role of the environment in determining the dominant eye and hand.
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