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KMID : 1159320230250020169
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Korean Journal of Vision Science
2023 Volume.25 No. 2 p.169 ~ p.180
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The Optical Analysis of ‘Adjustable-Focus Eyeglasses’ Sold Online and the Changes in Visual Acuity and Stereopsis after Wearing Them
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Song Je-Min
Jeon In-Chul
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Abstract
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Purpose : To find out how ‘adjustable-focus eyeglasses’ affect the wearer and to optically analyze ‘adjustable-focus eyeglasses’.
Methods : To optically analyze the ‘adjustable-focus eyeglasses’, a lensmeter (HLM-1, Huvitz, Korea) was used and the right lens was analyzed. ‘adjustable-focus eyeglasses’ was dissembled into single lenses, an anterior lens and a posterior lens. The anterior, posterior, and overlapped lenses’ spherical power, cylinder power, prism and base direction were measured at specific point. The test was conducted on 40 adults (80 eyes), 23.58±4.08 years old, without ocular or systemic diseases and without refractive surgery. Before and after wearing ‘adjustable- focus eyeglasses’, a distance vision test, near visiual acuity, and stereopsis test were performed.
Results : In the single lens, the spherical power of the anterior lens is (-) on the temporal side, (+) on the nasal side, and the spherical power of the posterior lens is (+) on the temporal side and (-) on the nasal side, so the spherical power gradually changed. The spherical, cylindrical, prism power and base direction of the overlapped lens did not show regularity. After wearing the ‘adjustable-focus eyeglasses’, visual acuity and stereopsis all deteriorated compared to before wearing them.
Conclusion : The 'adjustable-focus eyeglasses' sold online are not optically good and have not been prescribed by the optometrist, so they have several negative effects on the wearer.Therefore, it is not suitable to use 'adjustable-focus eyeglasses'.
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KEYWORD
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Astigmatism, Online, Spherical power, Stereopsis, Visual acuity
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