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KMID : 1011420170220020105
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Journal of Korean Ophthalmic Optics Society
2017 Volume.22 No. 2 p.105 ~ p.117
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The Effect of Difference in the Characteristics of Soft Lens Material and Main Component of Artificial Tears on Lens Centration and Dynamics
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Shin Hye-Min
Jang Ju-Hyun
Park Mi-Jung
Kim So-Ra
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Abstract
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Purpose: This study aimed to investigate the effect of artificial tear use on change of objective signs when wearing different soft contact lenses made of same etafilcon A except whether wetting agent was included or not.
Methods: Ninetyfour subjects (male, 17; female, 30) between nineteen and thirty-six were divided into two groups, those with normal (18 subjects) and dry eyes (29 subjects), according to their tear volume and asked to wear soft contact lenses made of either etafilcon A or etafilcon A with a wetting agent for 6 hours. Before and after instilling artificial tears containing either carboxymethyl cellulose sodium (CMC) or polysorbate 80 (PS80) as a main component, lens centration on the cornea and lens dynamics (lag) and lens recovery time were measured as objective signs and their change was further analyzed.
Results: Lens centration didn"t show significant change according to lens wearers" tear volume, main component of artificial tear and a wetting agent in lens only except when wearing etafilcon A lenses with a wetting agent in normal eyes and using PS80. Lens dynamics according to the main component of artificial tear were found to be good regardless of the wearers" tear volume and a wetting agent in lens since lens lag tended to decrease after instilling artificial tear however, the lens dynamics on dry eyes were not equivalent to those on normal eyes even with artificial tears. The speed of lens movement was influenced by both of the wearer"s tear volume and lens material characteristics since lens recovery time in normal eyes was shortened irrespective of the main component of artificial tear and the recovery time in dry eyes was shortened only in the case of instilling CMC, a viscosity thickener.
Conclusions: From the results of this study, it was revealed that changes in soft lens centration and dynamics according to the use of artificial tears varied depending on the wearers" tear volume and the lens material characteristics. Therefore, artificial tears may be used without the consideration of their main component when wearing soft lenses without a wetting agent in normal eyes. However, it is necessary to consider whether or not the change of visual correction appears after PS80 instillation when wearing lenses with a wetting agent in normal eyes. On the other hand, in case of dry eyes, it is necessary to consider the instillation numbers larger than CMC for faster lens centration when using PS80 regardless of whether or not the wetting agent is included in the lens.
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KEYWORD
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Soft contact lenses, Wetting agent, Artificial tear, Viscosity thickener, Surfactant, Normal eyes, Dry eyes, Lens centration, Lens dynamics
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