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Characterization of tinted hydrogel contact lens containing 4-iodoaniline using titanium silicon oxide nanoparticles as additive
Purpose: Various studies have been conducted on macromolecular materials that not only have basic characteristics but also UV-blocking capabilities. Here we report tinted hydrogel contact lens containing titanium silicon oxide nanoparticles. This study also showed the physical and optical effects of 4-iodoaniline on contact lenses, which affect UV transmissibility. Methods: Titanium silicon oxide nanoparticles were used as additives. HEMA, MA, MMA, 4-iodoaniline and a cross-linker EGDMA were copolymerized in the presence of AIBN as an initiator. The physical properties such as water content, refractive index, contact angle, spectral transmittance of produced contact lenses were measured. Results: Measurement of the physical characteristics of the copolymerized material showed the water content of 38.68~35.01%, refractive index of 1.4350~1.4418, contact angel of 34.15~57.25° and spectral transmittance of 1.0~84.8%. Also, the transmittance for UV light was reduced significantly in combinations containing titanium silicon oxide nanoparticles. Conclusions: Tinted hydrogel contact lens material containing titanium silicon oxide nanoparticles is expected to be able to be used usefully as a material for UV-block hydrogel contact lens.
