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KMID : 1011420180230040461
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Journal of Korean Ophthalmic Optics Society
2018 Volume.23 No. 4 p.461 ~ p.465
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Effect of Strain on Eyeglasses Lens on Visual Field Clearness
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Cha Jung-Won
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Abstract
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Purpose: To confirm whether the clearness of the eyeglasses lens is affected by strain exerted on the lens by the eye glasses frame and to study whether eyeglasses wearers perceive a blur to what they see.
Methods: When strain is applied to the lens of the eyeglasses, the refractive power change or image blur was assessed using a strainer, auto lensometer, and cell phone camera. Pearson correlation analysis of the strain score of the lens vs. eyeglasses clearness survey score was performed using SPSS 23.0.
Results: It was difficult to find a large change in refractive power caused by strain on the lens. There was a significant negative correlation between eyeglasses clearness survey score and total strain score of the lens.
Conclusions: It was found that as the strain applied to the lens increases, eyeglasses wearer perceive more blurring of vision.
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KEYWORD
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Eyeglasses lens, Strain, Clearness, Birefringence, Photoelasticity
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