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KMID : 1159320140160010033
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Korean Journal of Vision Science
2014 Volume.16 No. 1 p.33 ~ p.41
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Characteristic changes of polymer based lens and coatings exposed to the artificial acid rain
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Kim Kuen-Hei
Noh Hye-Ran
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Abstract
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Purpose: Characteristic changes of ophthalmic lens and coatings were studied after immersing polymer based lens into the acidic solution with varying acidity.
Methods: The ophthalmic lens (polyvinylester and polyurethane types) were immersed in the acidic solution (pH 2.4~6.0) for 1-5 weeks. Changes in optical and physical properties were measured.
Results: As increasing time exposed to acidic solution, visible light transmittance, contact angle, hardness, and wear resistance of lenses were decreased. In particular, the hardness of the vinyl ester type and two of polyurethane lenses exposed to strong acid (pH 2.4) for 5 weeks were decreased to 34.7%, 52.3%, and 29% respectively. Adhesiveness of urethane lens and vinyl ester lens after immersed in acidic solution were came out as 4B and 5B respectively. Electric field penetrating lenses were all blocked regardless of the immersion time and acidity of solution.
Conclusions: The results showed that the repeated exposure to the acidic solution may change the optical, physical properties of ophthalmic lens with decreased durability of the lens coating and lens materials alteration.
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KEYWORD
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light transmittance, hardness, adhesiveness, acid rain
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