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KMID : 0360220090500020275
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Journal of the Korean Ophthalmological Society
2009 Volume.50 No. 2 p.275 ~ p.279
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The Refractive Errors of Dominant and Non-dominant Eyes
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Cho Kyuong-Jin
Yang Suk-Woo
Kim So-Youl
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Abstract
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Purpose: To evaluate differences between dominant and non?dominant eyes through analyzing refractive factors in determination of the dominant eye.
Methods: Sixty?two subjects without underlying ocular disease were recruited. Ocular dominance was determined using the holein? the?card test. Uncorrected visual acuity, refractive error, and intraocular pressure (IOP) were checked in both eyes.
Results: Mean uncorrected visual acuity of the dominant and non?dominant eye were 0.41 and 0.39, respectively. The number of patients whose uncorrected visual acuity of the dominant eye was superior to the non?dominant eye was 18(29%), and inferior to the non?dominant eye was 18(29%). Mean refractive power in the dominant eye was -3.2 diopter and ?3.43 diopter degrees in the non?dominant eye, therefore no difference in degrees of myopia between the groups (P=0.282) was observed. The number of patients whose dominant eye had a greater degree of myopia than the non?dominant eye was 24(39%) and the patients with a lower degree of myopia in the dominant eye was 32(52%). Astigmatism of the dominant eye was lower than the non?dominant eye in 35(56%) of the patients, thus a significant relationship was shown between astigmatism and the dominant eye (P=0.0014). The mean IOP of the dominant eye was 15.4 mmHg and the non?dominant eye was 15.7 mmHg, showing no significant difference between eyes.
Conclusions: The dominant eye showed a lower degree of astigmatism than the non?dominant eye. The previous belief that myopia is more progressed in the dominant eye than the non?dominant eye because of excessive accommodative use of the dominant eye requires further study.
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KEYWORD
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Astigmatism, Dominant eye, Non?dominant eye, Visual acuity
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