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UV-Blocking effect of hydrogel contact lenses material containing aniline group
Purpose: The physical and optical characteristics for copolymers produced by adding 3-Iodoaniline and 3-chloroaniline to the various monomers commonly used for ophthalmic contact lenses were investigated. Methods: The basic hydrogel ophthalmic lens material with addition of 3-Iodoaniline and 3-chloroaniline respectively were polymerized by heating at 80℃ for 20 mins, and then 110 ℃ for 40 mins. To produce contact lenses, a cast mould method was used. The produced contact lenses samples underwent the pre-process by being hydrated in 0.9% NaCl saline for 24 hours. Afterward, their physical and optical properties were measured. Results: The results showed that the average value of refractive index increased and the water content decreased as the ratio of additive increased. The measurement of the optical transmittance of the copolymerized polymer with addition 3-Iodoaniline showed that the transmittance for visible ray, UV-B and UV A is 89.4~90.8%, 2.0~15.2% and 40.6~67.8%, respectively. Also, for samples with addition 3-Iodoaniline, the transmittance for visible ray, UV-B and UV-A was in the range of 89.8~90.6%, 5.0~22.2% and 57.6~73.8% respectively. Conclusions: It is expected that the results would contribute to a wider application of contact lenses containing aniline group which are to be used as ultraviolet ray blocking contact lenses.
