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KMID : 1011420090140040053
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Journal of Korean Ophthalmic Optics Society
2009 Volume.14 No. 4 p.53 ~ p.57
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A Study About N.P.C, Heterophoria and Near Convergence and Divergence by Amount of the Refractive Errors
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Choi Sun-Mi
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Abstract
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Purpose: To study the relationship of N.P.C, heterophoria and near convergence and divergence by amount of the refractive error.
Methods: All subjects have no ocular disease and their mean age is 22.7. All 39 subjects examined about refractive error, near point of convergence (NPC), heterophoria, near convergence and divergence.
Results: Classified by low refractive state, middle refractive state, and high refractive state compared with the expected value of Morgan. NPC had been measured within low and middle refractive state eight all the 8cm. However, high refractive state measured 9.64 cm. Low and middle refractive state for the classification by near phoria. Near esophoria groups was smallest by near divergence and exophoria groups was smallest by near convergence.
Conclusions: Near convergence were largest with esophoria while near divergence were largest with exophoria.
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KEYWORD
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Refractive error, Near point of convergence, NPC, Esophoria, Exophoria
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