Presbyopia is a condition that occurs with age. It's related to the failure of the crystalline lens, the second lens in the eye, to accommodate, or reshape. This failure to reshape happens because the lens becomes stiffer with age. It no longer has the ability to see near and far, so it needs additional aid to look at things from a longer distance. Susana Marcos, professor of research at the Institute of Optics (CSIC), says the long-term goal for correcting presbyopia is to replace the crystalline lens with another lens that can restore the function of reshaping. Scientists are now working on developing new lenses that can reshape themselves.

Originally released by Inside Science, 2016. Streaming video file encoded with permission for digital streaming by Infobase on September 25, 2017.

IYL Adaptive Optics (2:37);