Indian Journal of Clinical and Experimental Ophthalmology


Determination of ocular dominance and its association with handedness


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Author Details: Vani Puri, Amit Sethi

Volume : 3

Issue : 4

Online ISSN : 2395-1451

Print ISSN : 2395-1443

Article First Page : 504

Article End Page : 506


Abstract

Purpose: Clinical relevance of ocular dominance [OD] lies in its role in success of monovision. This study aims to determine easy and reliable methods to test OD and association of OD with handedness.
Methods: Prospective study of 300 patients, with best corrected visual acuity of 6/6, interocular difference of < 1Dioptre, and absence of any ocular, oculomotor or binocular abnormalities. Two subjective tests were done to determine OD - Miles [sighting dominance] and Fogging tests.
Handedness was determined by history. Ambidextrous patients and those unable to understand or giving equivocal replies, were excluded. Kappa [k] statistics [inter test agreement], and Chi-Square test and Odds ratio [association between handedness and ocular dominance] were applied.
Results: Mean age 35.28 years, spherical equivalent refractive error ranged +2 and -6 D. Both tests had perfect agreement [k=1].
67.33% patients were Right Ocular Dominant (ROD) whereas 32.67% were Left Ocular Dominant.
65.67% had matched dominance of eye and hand.
No significant association between handedness and ocular dominance.
Conclusion: Mile’s and Fogging tests are reliable and easy to perform in clinical setting. Since no direct analogy could be established between patterns of eye – hand dominance, assumption of OD cannot be made on the basis of handedness. As 94.33% patients were Right Handed whereas 67.33% were ROD, the results could not be directly extrapolated in patients with dense cataracts where OD cannot be conclusively determined.

Keywords: Handedness, Monovision, Ocular dominance