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KMID : 1011420140190010031
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Journal of Korean Ophthalmic Optics Society
2014 Volume.19 No. 1 p.31 ~ p.42
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Changes in Subjective Symptom, Tear Film Stabilization and Blinking Rates when Wearing RGP Lenses with Different Polishing Conditions for Certain Period of Time
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Park Mi-Jung
Kim Hyo-Gyum
Bae Jun-Seob
Park Jung-Ju
Kim So-Ra
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Abstract
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Purpose: The present study was conducted to investigate the effect of the physical properties of RGP lens induced by lens polishing on the actual wearer’s subjective comfort, the tear film break-up time and the blinking rate as a follow-up study that revealed the relationship between the lens physical properties during lens manufacturing and lens wearer’s factors.
Methods: RGP lenses made from the three different polishing conditions(25, 50 and 100 seconds) were applied on 28 eyes of 17 subjects, aged 20 to 29 years, without any known disease and surgical history in the eyes. While the subjects were asked to wear the RGP lenses longer than a week, the questionnaire for the comfortability was administered everyday. Subjective and objective tear break-up time and blinking rate of the wearers were further measured.
Results: The wearer’s subjective comfortability showed some difference in the type of discomfort and satisfaction score according to the polishing status when wearing RGP lenses made from different polishing conditions longer than a week, and a bigger difference in satisfaction score induced by polishing condition was especially shown in experienced RGP lens wearer rather than un-experienced wearer. In the case of RGP lens wearer compared with the ones without the wearing experience, as the wearing time increased subjective and objective tear break-up time were increased and the
blinking rate was decreased. However, subjective and objective tear break-up time were tended to decrease with even longer wearing time when wearing the RGP lens made from the polishment for 100 seconds.
Conclusions: These results confirmed that the optimization of physical properties of the lens may not give the same effect on the wearer’s subjective and objective symptoms and other factors when actual wearing. From the results, it can suggest that the success rate of RGP lens wear may be changed by physiological factors such as the stabilization of wearer’s tear film, comfortability and lens wearing experience when wearing RGP lens based on ‘The manufacturing standard for soft contact lens/hard contact lens’ provided by Korea Food and Drug Administration.
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KEYWORD
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Polishing condition for RGP lens, Experience of RGP lens wearing, Comfortability, Discomfort, Non-invasive tear break-up time, Subjective tear break-up time, Blinking rate
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