The physical and antibacterial properties of ophthalmic lenses fabricated by copolymerization with hydrogel monomers using two types of graphene were measured, and their usability as contact lens materials was analyzed. For polymerization, silicone monomers, including SID-OH, 3-(methacryloxy)propyl tris(trimethylsiloxy)silane, and decamethylcyclopentasiloxane, were used, and N,N-dimethylacetamide, ethylene glycol dimethacrylate as a crosslinking agent, and azobisisobutyronitrile as an initiator were added. Also, graphene oxide nanoparticle (GON) and graphene nanoplate (GNP) were used as an additive, and the physical properties of the lenses fabricated after copolymerization were evaluated. The fabricated lenses satisfied the basic physical properties of general hydrogel contact lenses and showed the characteristics of lenses with high water content, and the disadvantage of very weak durability, due to low tensile strength. However, it was confirmed that the tensile strength and antibacterial properties were greatly improved by adding GON and GNP. With GON, the oxygen permeability and refractive index of the fabricated lenses were slightly improved. Therefore, it was determined that the graphene materials used in this study can be used in various ways as a contact lens material.

Abstract
1. Introduction
2. Experimental
    2.1. Reagents and materials
    2.2. Polymerization
    2.3. Experiment equipment
3. Results and Discussion
    3.1. Fabrication and analysis of functional siliconehydrogel lenses
    3.2. Fabrication and analysis of functional siliconehydrogel lenses containing graphene
4. Conclusion
Acknowledgement
References

• Su-Mi Shin(Department of Optometry & Vision Science, Daegu Catholic University, Gyeongsan 38430, Republic of Korea)
• Hye-In Park(Department of Optometry & Vision Science, Daegu Catholic University, Gyeongsan 38430, Republic of Korea)
• A-Young Sung(Department of Optometry & Vision Science, Daegu Catholic University, Gyeongsan 38430, Republic of Korea) Corresponding author