Well, yes, obesity can lead to some eye diseases. In some degree, it can lead to blindness. So you should pay more attention to it, if you are obese people. And maybe diet is a good way for you to avoid the diseases. Generally speaking, according to some researched, overweight and obese people with their unhealthy lifestyle could put their eyesight at risk. And many experts have said that obesity is linked to conditions such as diabetes, heart disease and cancer. But on the other hand, you should know that research shows that obesity is also linked to eye problems which could lead to sight loss. When you are obese, your blood pressure will be high and then, it can make your eye pressure high and have eye strain also. In some dangerous cases, it can lead to blindness. Anyway, just be careful about it.