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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

연마상태가 다른 RGP렌즈의 일정기간 착용 시 렌즈착용자의 자각적 증상, 눈물막 안정 및 순목횟수 변화

  • Park, Mijung (Dept. of Optometry, Seoul National University of Science and Technology) ;
  • Kim, Hyo Gyum (Dept. of Optometry, Seoul National University of Science and Technology) ;
  • Bae, Jun Seob (Dept. of Optometry, Seoul National University of Science and Technology) ;
  • Park, Jung Ju (Dept. of Optometry, Seoul National University of Science and Technology) ;
  • Kim, So Ra (Dept. of Optometry, Seoul National University of Science and Technology)
  • 박미정 (서울과학기술대학교 안경광학과) ;
  • 김효겸 (서울과학기술대학교 안경광학과) ;
  • 배준섭 (서울과학기술대학교 안경광학과) ;
  • 박정주 (서울과학기술대학교 안경광학과) ;
  • 김소라 (서울과학기술대학교 안경광학과)
  • Received : 2014.01.30
  • Accepted : 2014.03.15
  • Published : 2014.03.31

Abstract

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.

목적: 본 연구는 RGP렌즈 제조 시 렌즈물성과 렌즈착용자 요인과의 관계를 밝힌 선행연구의 후속 연구로 RGP렌즈 연마로 유발된 렌즈물성의 차이가 일정기간 착용 후 착용자가 느끼는 주관적 착용감 및 눈물막 파괴시간, 순목횟수 등에 미치는 영향을 알아보고자 하였다. 방법: 안질환이나 안과적 수술경험이 없는 20대 17명(남자7명, 여자 10명)의 28안에게 각기 다른 연마조건(25초, 50초 및 100초)으로 제조된 3 종류의 렌즈를 각각 1주일 이상 착용하게 하였으며 매일 설문지를 통하여 착용 중의 착용감을 조사하였고, 자각적 및 타각적 눈물막 파괴시간과 순목횟수를 측정하였다. 결과: 연마조건이 다르게 제조된 RGP렌즈를 일주일 이상 착용하였을 때 렌즈 착용자의 주관적 착용감은 렌즈 별로 불편감의 종류나 착용감 점수에서 차이를 보였으며, 특히 RGP렌즈 착용 경험자의 경우는 RGP렌즈 착용 미경험자와 비교하여 연마조건에 따른 착용감 점수의 차이가 크게 나타나는 경향을 보였다. RGP렌즈 착용 경험자의 경우 착용시간이 증가할수록 착용 미경험자에 비하여 렌즈에 더 잘 적응하는 양상을 보여 자각적 및 타각적 눈물막 파괴시간은 더욱 증가하는 경향을 보였으며, 순목횟수는 감소하는 경향을 보였다. 그러나 RGP렌즈 착용 경험 유무와는 관계없이 100초 연마렌즈 착용 시는 착용시간이 길어지더라도 자각적 및 타각적 눈물막 파괴시간은 감소하는 경향을 보였다. 결론: 이상의 결과로 렌즈물성의 최적화가 실제 착용 시에는 착용자의 자각적 및 타각적 증상에서도 동일한 효과를 내는 요인이 되지 못할 수도 있음을 확인하였다. 본 연구결과로부터 현재 식약처에서 제시하고 있는 '소프트콘택트렌즈/하드콘택트렌즈의 제조 기준규격'에 따라 제조된 RGP렌즈는 실제 착용 시 착용자의 눈물막 안정화나 착용감, 렌즈 착용 경험 유무와 같은 생리적 요인에 따라 착용성공률이 달라질 수 있음을 제안할 수 있다.

Keywords

References

  1. Chan JS, Mandell RB, Johnson L, Reed C, Fusaro R. Contact lens base curve prediction from videokeratography. Optom Vis Sci. 1998;75(6):445-449. https://doi.org/10.1097/00006324-199806000-00028
  2. Kim JH. GP contact lens, 1st Ed. Seoul; Hyunmun-sa. 1998;7.
  3. Lee KN, Shin HS, Andre B, Jeon IC, Mah KC. Effect of surface plasma treatment on physicochemical characteristics of rigid gas permeable contact lens. Korean J Vis Sci. 2013;15(2):189-200.
  4. Kim HA, Byun JW, Kim HJ, Jeon IC, Mah KC. The short-term effect and durability of surface plasma treatment of RGP contact lenses. Korean J Vis Sci. 2012;14(4):391-401.
  5. Jang JK, Shin HS. The effects of plasma surface treatment on fluorosilicone acrylate RGP contact lenses. J Korean Oph Opt Soc. 2010;15(3):207-212.
  6. Shin H-S, Jang J-K. Effect of atmosphere and time on the RGP lens surface treated by using a plasma. Korean J Vis Sci. 2013;15(2):157-164.
  7. Korean Food and Drug Administration. The standard specification of medical devices, revised-Hard contact lens/Soft contact lens No. 2012-96, available at http://www.kfda.go.kr/medicaldevice/index.do?nMenuCode=22&page=1&page=1&mode=view&boardSeq=67936 (2014.1.17.)
  8. Kong H, Cha YH, The observation of lens surface change and its characteristics by polishing stress during RGP lens manufacturing. Bachelor's Thesis of Optometry department of Seoul National University of Science and Technology, 2010;289-300.
  9. Park MJ, Park HY, Park JJ, Kong HJ, Cha YH, Kim SR, The relationship between lens properties and the lens wearer's factors in RGP lens manufacturing. J Korean Oph Opt Soc. 2013;18(1):27-35.
  10. Mengher LS, Bron AJ, Tonge SR, Gilbert DJ. A noninvasive instrument for clinical assessment of the pre-corneal tear film stability. Curr Eye Res. 1985;4(1):1-7. https://doi.org/10.3109/02713688508999960
  11. Madden RK, Paugh JR, Wang C. Comparative study of two non-invasive tear film stability techniques. Curr Eye Res. 1994;13(4):263-269. https://doi.org/10.3109/02713689408995787
  12. Ousler GW, Emory TB, Welch D, Abelson MB. Factors that influence the inter-blink interval(IBI) as measured by the ocular protection index (OPI). Invest Ophtalmol Vis Sci. 2002;43(12):E56.
  13. Park MJ, Kwon HL, Choi SA, Kim SR. Changes in subjective/ objective symptoms and the light transmissibility of lens associated with overusage of daily disposable circle contact lenses in normal eyes. J Korean Oph Opt Soc. 2013;18(4):429-439. https://doi.org/10.14479/jkoos.2013.18.4.429
  14. Nally L, Ousler GW, Abelson MB. Ocular discomfort and tear film break-up time in dry eye patients: a correlation. Invest Ophtalmol Vis Sci. 2000;41(4):E1436.
  15. Lee J, Choi WS. Blinking frequency in normal and dry eye. J Korean Oph Soc. 1988;29(4):477-480.