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KMID : 1011420130180040457
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Journal of Korean Ophthalmic Optics Society
2013 Volume.18 No. 4 p.457 ~ p.463
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Influence of Artificial Tear Containing Carboxymethyl Cellulose Component on Physical Properties of Hydrogel Contact lens
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Cho Seon-Ahr
Sung A-Young
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Abstract
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Purpose:To determine the impact of artificial tears which include carboxymethyl cellulose on a hydrogel contact
lenses.
Methods:A contact lenses made of the cross-linking agent, EGDMA (ethylene glycol dimethacrylate) and
HEMA (2-hydroxyethyl methacrylate) and with added NVP (n-vinyl-2-pyrrolidone) and MMA (methyl methacrylate)
was evaluated for water content, refractive index, spectral transmittance and contact angle of produced contact
lens.
Results:The physical properties of the sampled copolymerized polymers showed that water content,
refractive index, visible ray transmittance and contact angle were in the range of 26.61%~48.58%, 1.422~1.455,
80.8%~91.4% and 33.93o~65.70o, respectively. In addition, after soaking with artificial tears, the water content,
refractive index and contact angle were in the range of 24.46%~48.25%, 1.422~1.457, 77.0%~91.0% and
37.25o~77.33o, respectively. The changes of the physical property depending on hydration time and showed an
increase of refractive index and contact angle, decrease of water content and visible ray transmittance.
Conclusions: Artificial tears which include carboxymethyl cellulose sodium which is used as a wetting agent influenced water content, refractive index, contact angle and spectral transmittance of a hydrogel contact lenses.
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KEYWORD
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Carboxymethyl cellulosesodium , Refractive index , Water content , Contact angle
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