No, the leading cause is age-related macular degeneration. The macula is the centre of the eye, a very rich area in terms of blood vessels and oxygen flow. That's the area of your eye that allows you to do fine work: read, sew, write, that sort of thing. Your risk for AMD, as we call it for short, age-related macular degeneration, can be reduced by following the same health regime we advise people to follow to reduce the risk of diabetes, etc., because it is another vascular illness, essentially.
You can't prevent it. Family history and genetics are risk factors. Fair skin is a risk factor. Blue eyes are a risk factor, etc. But unhealthy eating, smoking, all of those things, will increase your chances. Smoking in particular will increase your chances of getting age-related macular degeneration by 30%. So at this point we're into public health for prevention.