Low vision means you lose a magnitude or so when looking at the stars or can't see subtle details on planets. Low vision occurs in the eye retina, a very highly specialized nerve tissue that is an extension of brain tissue. Yes, it is your brain's window on the world. As it deteriorates, the ability to focus is lost and eventually everything becomes a blur. Demographic Evidence Tells the Story Over four decades ago, scientists noticed that cataract development correlated with geographic location, lifestyle, and food habits.
Cataracts occur most where the sun is brightest and the upper atmosphere ozone the lowest.
In short, ultraviolet light hitting the eye lens is the root cause. People whose diets are poorest in vegetables and fruits, especially those rich in vitamins C and E and bioflavonoids, have the highest rates of cataracts everywhere. Confirming studies abound. Confirmation also comes from the antioxidant composition of the eye. Similarly, all tissues are rich in two specific bioflavonoids, lutein and zeaxanthine.