Fig. 3.

a UV-Vis Transmission spectra of Gr lens with an increasing number of Breath in - Breath out cycles. b UV-Vis Transmission spectra of Gr lens with increasing dipping time c The CLs changing visible coloration after breath in - breath out cycles d The CLs changing visible coloration after dipping time e Commercial contact lens on an eye model f)Graphene incorporated commercial contact lens on an eye model g 3D printed Gr-HEMA pattern on CLs h 3D printed Gr-HEMA pattern on CLs on an eye model