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KMID : 1011420130180010027
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Journal of Korean Ophthalmic Optics Society
2013 Volume.18 No. 1 p.27 ~ p.35
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The Relationship between Lens Properties and the Lens Wearer’s Factors in RGP Lens Manufacturing
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Park Mi-Jung
Park Ha-Young
Park Jung-Ju
Kong Hee-Jung
Cha Young-Hwa
Kim So-Ra
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Abstract
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Purpose: The present study was conducted to investigate the changes in the physical properties of RGP lenses induced by the polishing during the process of RGP lens manufacturing, and further evaluate the differences in the actual wearer`s comfort and the tear film break-up time caused by these changes. Methods: RGP lenses (fluorosilicone acrylate material) were divided into 4 groups by the different lens-polishing time like 0, 25, 50 and 100 seconds and the thickness, the surface roughness and the wetting angle of those lenses were compared. Furthermore, the comfortability of the lens wear was surveyed after applying these lenses on the subject`s eyes with normal tear volume and the non-invasive tear break-up time of the wearers was measured. Results: The central thickness of 4 RGP lenses made of different lens-polishing time was not significantly different however, the lens surface was changed smoother after polishing to be confirmed by scanning electron microscopy. The wetting angle of the RGP lens significantly decreased in accordance with the increase of polishing time. Thus, the difference of approximately 16o between 0 second and 100 seconds-polishing was statistically significant. The actual wearing feeling of RGP lens was tended to improve in accordance with the increase of the lens wettability however, it was not proportional improvement. The non-invasive tear break-up time of the lens wearers showed different aspect compared with the changes in lens wettability and the actual feeling of RGP lens wear. Conclusions: In this study, better lens wettability, thinner lens thickness, and/or improved lens surface induced by physical stimuli in the process of RGP lens manufacturing was not well-correlated with the increase of actual subjective/objective satisfaction in RGP lens wear. Thus, the consideration of physical properties of the lens as well as the lens wearers` physiological factors in the process of RGP lens manufacturing may be suggested.
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KEYWORD
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RGP lens manufacturing, Polishing, Surface roughness, Wetting angle, Wettability, Comfortablity, Non-invasive tear break-up time
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