See also: metabolic bone disease in lizards. Also caused by a lack of light — in their case, near-UV light. (My understanding is that the thing changing the sh

See also: metabolic bone disease in lizards. Also caused by a lack of light — in their case, near-UV light. (My understanding is that the thing changing the shape of the eye over time is the development of the orbital socket bones — so nearsightedness and MBD could have more in common than it seems.)