Poly(methyl methacrylate) is used medically in contact lenses and cataract substitutes due to its refractive index, is used industrially for its strength and transparency, and is used because it is lightweight when compared to glass. Medical uses of poly(methyl methacrylate)The first advantage of Pmma over other materials is from a medical point of view. Pmma is used in many areas of the medical field; From dentistry to orthopedics, poly(methyl methacrylate) has revolutionized the way we all live. Pmma is widely used today as an implant device due to its ability to fill gaps in fissures and create smooth surfaces for insertion of bones and ligaments and to prevent unwanted movement. Another medical use of PMMA is in ophthalmology since polymethyl methacrylate has excellent optical properties. PMMA transmits up to 93% of visible light, which is far superior to glass which only transmits around 85% of light. (Koleva, M, 2016) The refractive index of pmma is due to its crystalline, rather than amorphous, structure