Figure 1.

The human eye is constantly exposed to sunlight and artificial light. Exogenous sources of ROS, such as UV rays, visible light, ionizing radiations, chemotherapeutics, and environmental toxins, contribute to oxidative damage in the ocular tissues. In the long-term, such injuries expose the aged eye to considerable risk of the pathological consequences of oxidative stress. While this affects practically all organs and apparatuses, it has a heavy impact in diseases such as glaucoma, dry eye and age-related macular degeneration.