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Optical characterization of 2-ethylhexyl trans-4-methoxy-cinnamate and benzophenone materials in hydrogel soft contact lens
Purpose : Recently, the eye disease associated with ultraviolet radiation were reported. In this study, the UV-block hydrophilic soft contact lens using 2-ethylhexyl trans-4-methoxy-cinnamate were manufactured and the optical properties of copolymerized materials were measured. Methods: The basic hydrophilic soft contact lens material with addition of Dhb(2,4-dihydroxy benzophenone) 0.5% ~ 1.0%, Thb(2,4,4-trihydroxy benzophenone) 0.5% ~ 1.0% and Hmb(2-hydroxy-4-methoxy benzophenone) 0.5% ~ 1.0% respectively were polymerized and the hydrophilic soft contact lens were manufactured by cast mould method. The lenses were stored in a 0.9% NaCl normal saline for analysis. Results: In the measurement of DHB samples, the optical transmittance showed the UV-B transmittance of 2.1 ~ 4.3%, UV-A transmittance of 19.0 ~ 27.2% and visible transmittance 88.8 ~ 90.1%. And also, in the case of THB samples, the optical transmittance of UV-B, UV-A and visible transmittance was 2.0 ~ 2.4%, 13.6 ~ 18.8% and 89.5 ~ 90.9%, respectively. Also, in the case of HMB samples, the optical transmittance of UV-B, UV-A and visible transmittance was 4.0 ~ 12.3%, 22.5~37.2% and 87.9 ~ 89.2%, respectively. Conclusions: Based on the results of this study, 2-ethylhexyl trans-4-methoxy-cinnamate with benzophenone materials were suitable for use as a material to UV-block hydrophilic lens.
