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KMID : 1159320170190040503
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Korean Journal of Vision Science
2017 Volume.19 No. 4 p.503 ~ p.508
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Study on the Calculated and Actual Magnification of Optical Aids for Low Vision Rehabilitation
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Seo Jae-Myoung
Daniela Quedenfeld
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Abstract
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Purpose: To compare theoretically calculated magnification to practically prescribing magnification and investigate if the magnification is affected by the max. accommodation.
Methods: The calculated magnification estimated by visual acuity for distance and the required visual acuity was compared to the practically prescribing magnification for use for 16 normal and 27 low vision subjects. Max. accommodation was measured by push-up test with Landolt ring.
Results: The practically prescribing magnification was 1.17 times higher than calculated magnification but they did not reach the statistical significance (p=0.67). Both were good correlated (r=0.92). It showed that the magnification was not affected by max. accommodation.
Conclusions: It is thought that it is the best way to adjust the magnification with guide to the one recommended by the ptical manufacture when to determine the magnification for patient with low vision.
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KEYWORD
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Low Vision, , Optical Aids for Low Vision, Calculated Magnification, Actual Magnification, Maximal Accommodation
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