Most forms of all-around fitness involve some kind of weightlifting. Whether you have an interest in lifting to bulk up or simply to tone your body, experts say that it’s a valuable part of exercising. Regardless of where your interests lie, we all lift weights for the same reason: to improve our body shape and overall health. It might surprise you to learn that lifting weights can also affect your body in a negative way. Studies have shown that individuals who lift weights are at a higher risk of glaucoma, an eye disease which can lead to permanent blindness.