Journal of the Korea Management Engineers Society (한국경영공학회지)

Korea Management Engineers Society (한국경영공학회)
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Changes in the Covering of Pupil and the Visual Acuity by the Illuminance when Wearing Circle Soft Contact Lens

써클 소프트콘택트렌즈 착용 시 조도에 따른 동공의 가려짐과 시력 변화

  • Kim, So Ra (Dept. of Optometry, Seoul National University of Science and Technology) ;
  • Choi, Jae Hyung (Dept. of Optometry, Seoul National University of Science and Technology) ;
  • Lee, Kang-Geun (Dept. of Optometry, Seoul National University of Science and Technology) ;
  • Park, Mijung (Dept. of Optometry, Seoul National University of Science and Technology)
  • 김소라 (서울과학기술대학교 안경광학과) ;
  • 최재형 (서울과학기술대학교 안경광학과) ;
  • 이강근 (서울과학기술대학교 안경광학과) ;
  • 박미정 (서울과학기술대학교 안경광학과)
  • Published : 2013.03.31
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Abstract

Purpose: The degree of the pupil covered with tinted region of circle soft contact lens was determined according to the illuminant conditions in everyday life and the change of visual acuity by its covering was further investigated. Methods: The circle contact lens having the non-tinted area of 6.2 mm in the center of the lens was applied on 82 eyes in their 20s and their minimum separable visual acuity and minimum legible visual acuity were determined under the luminances of 50 and 370 lux. Results: The covering of pupil was not found when wearing circle contact lens under 370 lux, however, some pupil covering ranged from 0.40 to 1.70 mm was observed in all subjects under 50 lux. The minimum separable visual acuity and minimum legible visual acuity were significantly decreased by the wearing of circle contact lens under 50 lux and the correlation between the larger pupil size of subjects and more decrease of visual acuity was observed. Furthermore, the decrease of minimum separable visual acuity was larger than the case of minimum legible visual acuity indicating that minimum separable visual acuity was largely affected by the covering of pupil. Conclusions: The consideration is necessary for the lens wearers and the manufacturers since the wearing circle contact lens in low-light indoor or nighttime activities may affect directly visual acuity.

목적: 일상생활에서의 조도 환경에 따라 써클 소프트콘택트렌즈의 착색부분에 의한 콘택트렌즈 착용자의 동공 가려짐 정도를 확인하고 동공의 가려짐에 따른 시력 변화를 알아보고자 하였다. 방법: 20대 82안을 대상으로 비착색 부위가 렌즈 중심부 6.2 mm 직경인 써클 콘택트렌즈를 착용시키고 50 lx 및 370 lx의 조도에서 최소분리시력 및 최소가독시력을 측정하였다. 결과: 370 lx에서는 써클 콘택트렌즈 착용 시 착색부위에 의한 동공의 가려짐이 없었으나, 50 lx에서는 모든 실험대상안의 동공이 써클 콘택트렌즈에 의한 가려짐이 나타났으며 그 범위는 0.40~1.70 mm이었다. 50 lx에서는 써클 콘택트렌즈의 착용에 의해 최소가독시력 및 최소분리시력이 통계적으로 유의하게 감소하였으며, 동공 크기가 큰 실험대상안 일수록 시력의 감소 정도가 더 커지는 상관관계를 가짐을 확인할 수 있었다. 또한, 최소분리시력의 감소 정도가 최소가독시력의 경우보다 더 크게 나타나 동공의 가려짐에 의해 최소분리시력이 더 크게 영향을 받는 것을 알 수 있었다. 결론: 조도가 낮은 실내에서나 야간 활동 시의 써클 콘택트렌즈 착용은 시력에 직접적으로 영향을 끼칠 수 있으므로 이에 대한 착용자 및 제조사의 고려가 필요하다.

Keywords

References

  1. Schlanger JL. The JLS lens: an aid for patients with color vision problems. Am J Optom Physiol Opt. 1985;62(2):149-151. https://doi.org/10.1097/00006324-198502000-00014
  2. Astin CL. The use of occluding tinted contact lenses. CLAO J. 1998;24(2):125-127.
  3. Kim DH, Oh SJ, Hwang JH, Sung DY, Jeon IC, Choi HY, et al. The analysis of physicochemical properties of cosmetic color contact lenses. Korean J Vis Sci. 2008;10(3): 239-259.
  4. Snyder RW, Brenner MB, Wiley L, Yee RW, Gradus MS, Mackman GS, Microbial keratitis associated with plano tinted contact lenses. CLAO J. 1991;17(4):252-255.
  5. Gauthier CA, Grant T, Holden BA. Clinical performance of two opaque, tinted soft contact lenses. J Am Optom Assoc. 1992;63(5):344-349.
  6. Steinemann TL, Pinninti U, Szczotka LB, Eiferman RA, Price FW Jr. Ocular complications associated with the use of cosmetic contact lenses from unlicensed vendors. Eye Contact Lens. 2003;29(4):196-200. https://doi.org/10.1097/00140068-200310000-00002
  7. Park SH, Kim SR, Park M, The effect of circle lens and soft contact lens with identical material in clinical application on the eyes. J Korean Oph Opt Soc. 2011;16(2): 147-157.
  8. Kim SR, Park SH, Joo SO, Lee HR, Park MJ. A comparison of the movements of circle contact lens and soft contact lens with identical material on cornea. J Korean Oph Opt Soc. 2012;17(1):27-35.
  9. An JW, Kim JS, Kim JD, Cho CG. Aging change of pupil size in normal and diabetic patients. J Korean Ophthalmol Soc. 1992;33(4):410-414.
  10. Ryou JH, Kim HW, Park MG, Paik HJ. Pupil size in the dark in normal adults. J Korean Ophthalmol Soc. 1996; 37(10):1722-1729.
  11. Ko BU, Ryu WY, Park WC. Pupil size in the normal Korean population according to age and illuminance. J Korean Ophthalmol Soc. 2011;52(4):401- 406. https://doi.org/10.3341/jkos.2011.52.4.401
  12. Park MJ, Yang JH, Kim SM, Park SI, Park SH, Kim SR. Changes in centration of contact lenses on cornea and blink rate associated with overusage of disposable lenses. J Korean Oph Opt Soc. 2008;13(4):51-58.
  13. Yoo DS, Moon BY, Kim DH, Baik SM, Baik SO. Evaluation of transmittance characteristics of contact lenses. J Korean Oph Opt Soc. 2007;12(2):37-45.
  14. Park MJ, Kwon MJ, Hyun SH, Kim DS. The adsorption pattern of protein to the soft contact lens and its effect on the visible light transmission and the contact angle. J Korean Oph Opt Soc. 2004;9(1):53-68.
  15. Park MJ, Cho GT, Shin SH, Lee HS, Kim D. The diameter and base curve changes of soft contact lens by protein deposition. J Korean Oph Opt Soc. 2005;10(3):165-171.
  16. Jung DI, Lim SK, Kim SR, Park MJ. The comparison of lens movement by the fitting states of soft contact lenses in normal and dry eyes. J Korean Oph Opt Soc. 2011; 16(1):21-30.
  17. Liu H, Thibos L, Begley CG, Bradley A. Measurement of the time course of optical quality and visual deterioration during tear break-up. Invest Ophthalmol Vis Sci. 2010;51(6): 3318-3326. https://doi.org/10.1167/iovs.09-4831