Do glasses lead to bad eyesight evolving?

In an earlier voyage Fitzroy had brought back to London several natives from Tierra del Fuego where they were exhibited for the king and queen, and on the famous voyage of the Beagle with Darwin he returned three of the natives to their homeland. Darwin had ample opportunity to observe them, and this excerpt is from Janet Browne's biography: It makes sense that human populations living in environments where good eyesight was a true advantage would exhibit good eyesight more often than European populations of the period. I wonder if this has ever been properly studied.--Percy

Making sure I understand... So you were slightly nearsighted by age 16? And you became more nearsighted as you grew older?If I understood you properly, then your experience is very atypical. Most people become more farsighted with age. As we age nearly unavoidable physiological changes occur in the eye that cause longer and longer focal lengths.--Percy

The physiological changes in the eye that most often occur with age are independent of where one begins on the near/far sighted scale. The eye tends to elongate front to back, and the lens tends to grow away from the ring of muscle that surrounds it. There's no guarantee this will happen, but it's what happens to most people as they age.For most people, sometime between age 40 and age 60 their eyes take on a fixed focal length. For people nearsighted in youth they often discover their eyesight improves with age. Those lucky enough to have their focal length freeze up at some useful distance such as 8 or 10 feet might find that they see well enough at both near and far distances to not need glasses most of the time.--Percy