41. Origin Of Lens
Modern knowledge pronounces that Bacon Roger 1214 AD - 1286 AD had invented lens.
Indians pioneered in surgery. Sushruta (800 BC) was considered the earliest surgeon. His famous treatise "Sushruta Samhita" declares that he had performed many eye surgeries and removed cataract. Ancient doctors who performed eye surgeries and eye transplants could not be unaware of utility of lens.