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Evaluation of pigment location in tinted soft contact lenses.

 Ji Won Jung  ;  Sun Hyup Han  ;  Sang ah Kim  ;  Eung Kweon Kim  ;  Kyoung Yul Seo  ;  Tae-im Kim 
 Contact Lens & Anterior Eye, Vol.39(3) : 210-216, 2016 
Journal Title
 Contact Lens & Anterior Eye 
Issue Date
Absorption, Physicochemical ; Colorimetry/methods ; Coloring Agents/analysis* ; Coloring Agents/chemistry* ; Contact Lenses, Hydrophilic/classification* ; Equipment Design ; Equipment Failure Analysis ; Materials Testing/methods ; Microscopy/methods ; Surface Properties ; Tomography, Optical Coherence/methods
Atomic force microscopy ; Focused ion beam scanning electron microscopy ; Pigment location ; Surface roughness ; Tinted soft contact lenses
PURPOSE: The purpose of this study was to investigate efficient methods to evaluate the pigment layer location of tinted soft contact lenses and to assess various lens products on the market using those methods. METHODS: Two types of tinted soft contact lenses with known pigment location embedded or back surface were manufactured and examined. Light microscopy (LM), focused ion beam milling and scanning electron microscopy (FIB-SEM), and Fourier-domain optical coherence tomography (FD-OCT) were used to examine the pigment layer. Lens surface roughness was also measured using atomic force microscopy. In the second part of the experiment, pigment location and surface roughness of a clear lens (Lens A) and eight commercially-available tinted soft contact lenses (Lens B-I) were evaluated using FIB-SEM and FD-OCT. RESULTS: Pigment location could be reliably determined with FIB-SEM and FD-OCT. With LM, 40% of the lens sections were broken or deformed during slide preparation. The pigment particles in Lens B were buried below the front surface and there were no significant differences of roughness between the front and back surfaces. However, all tinted lenses with surface pigment had significant difference of roughness between front and back surfaces at the pigmented area. CONCLUSION: The FIB-SEM and FD-OCT could reliably locate the pigment layer of tinted soft contact lenses. In addition, lens surface roughness was influenced by pigment layer location.
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1. College of Medicine (의과대학) > Dept. of Ophthalmology (안과학교실) > 1. Journal Papers
Yonsei Authors
김상아(Kim, Sangah) ORCID logo https://orcid.org/0000-0002-8511-2903
김응권(Kim, Eung Kweon) ORCID logo https://orcid.org/0000-0002-1453-8042
김태임(Kim, Tae Im) ORCID logo https://orcid.org/0000-0001-6414-3842
서경률(Seo, Kyuong Yul) ORCID logo https://orcid.org/0000-0002-9855-1980
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