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KMID : 1011420120170020159
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Journal of Korean Ophthalmic Optics Society
2012 Volume.17 No. 2 p.159 ~ p.164
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Effect of Vision Training using Fresnel Prism Lens on Fusional Vergence and Accommodation
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Kim Yong-Gil
Kim Min-Kyung
Kim Hyun-Il
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Abstract
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Purpose: Of the various methods of vision training, the essay aims to explore the effective ways of using the
Fresnel prism lens in order to expand the positive fusional vergence for the patient having specific condition of
convergence insufficiency or basic exophoria.
Methods: 15 students of city of Daejeon university without an eye disease (average age 22.73±1.68) were selected and underwent the subjective refraction test and binocular vision test, and recording their test results before vision training and replacing an identical frame with a lens of same quality after the full calibration, the lens was then adhered with the Fresnel prism lens and continued to train for thirty minutes daily during two weeks. Afterwards, the binocular vision test was reattempted. The observation of the change in the results of the binocular vision test in use of the fresnel prism lens in the vision training test was researched.
Results: After training, the positive fusional vergence had increased to a number of 22.27±2.26 Δ? to 7.80 Δ? at near, the fused cross cylinder test increased to an average of 0.55±0.09 D, 0.40 D after training, showing a normal result. The value of negative relative accommodation after training had an average of 2.22± 0.08 D, showing that 0.42 D had increased. The value of near point of convergence after training had an average of 6.13±0.53 cm, showing that 2.80 cm had decreased. To patients who had convergence insufficiency or basic exophoria, the value of the near vision test that used the Fresnel prism lens which was able to expand BO positive fusional vergence had increased without phoria.
Conclusions: The changes were tested and the effectiveness of the Fresnel prism lens, due to the nature of the lens itself, helped with both cosmetic effects and cost. It also allows good optical correction effects, in addition to these clinical effects indicated before. Therefore, it may be determined that the Fresnel prism lens binocular vision therapy for patients is more popular and highly recommended.
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KEYWORD
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Fresnel prism lens, Vision therapy, Prism lens
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