how does obesity cause cataract, and glaucoma?

Answer 1

I think it is something to do with the fact that the eye is a very sensitive organ and that the extra blood pressure that is placed upon it by obesity does it damage

Answer 2

Obesity causes lots of health problems because if you are unhealthily obese, the blood in your body not to get to the extremities - eyes (glaucoma), legs (vericose veins), arms, you are more likely to get diabetes and heart disease too.

You can be healthy and still be obese...