Evaluation of Ultraviolet Blocking of Ophthalmic Lenses

안경렌즈의 자외선 차단 평가

  • Yu, Dong-Sik (Department of Visual Optics, Kyungwoon University) ;
  • Yoo, Jong-Sook (Department of Visual Optics, Kyungwoon University)
  • Received : 2008.07.24
  • Accepted : 2008.09.10
  • Published : 2008.09.30

Abstract

Purpose: To evaluate ultraviolet (UV) blocking characteristics of transparent and tinted ophthalmic lenses. Methods: The transmittance spectra of ophthalmic lenses were measured using the method suggested in ANSI Z80.1 standard. Transmittance percentage were calculated for each lens for UV (200~380 nm; UVA, UVB, UVC) and blue light portions (380~400 nm) of spectrum. Results: The results indicate that transparent plastic lenses with middle, high refractive index and tinted plastic lenses had superior UV blocking characteristics at UV radiation while UV blocker-untreated lenses such as crown glasses and CR39 did not. All except high refractive index lenses and anti-glare night vision lens was not effectively blocked blue light. Conclusions: Crown glass and CR39 lenses need to treat UV blockers to protect eyes from UV. Also, all lenes except high refractive index lenses and anti-glare night vision lens need to treat blue light blockers for protecting from blue light.