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Study on the Changes of Ophthalmic Plastic Lens due to Heating  

Cho, Hyun Gug (Department of Optometry, Kangwon National University)
Moon, Byeong-Yeon (Department of Optometry, Kangwon National University)
Publication Information
Journal of Korean Ophthalmic Optics Society / v.16, no.3, 2011 , pp. 247-253 More about this Journal
Abstract
Purpose: The changes in properties of plastic lens due to heating was investigated. Methods: Plastic lenses of -2.00 diopter were heated at 60-100$^{\circ}C$, and then changes of refractive power, surface condition and transmittance were examined. Results: It was shown that the changes of lens surface due to heating happened at 70$^{\circ}C$ for 1h, 75$^{\circ}C$ for 10 min and 100$^{\circ}C$ 10 sec, respectively. More serious crack was occurred in high index lens and at higher heating temperature, respectively, and transmittance decreased depending on the extent of the damage on the surface of lens. Conclusions: Heating at temperatures above 70$^{\circ}C$ drives cracks on the surface of lens. Optician should recommend an appropriate lens considering the wearer's working conditions and guide for paying attention when they use eyeglasses.
Keywords
Plastic lens; Crack; Heating;
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