Final answer:
The human eye is protected by the bony orbit, eyelids, and cornea, and produces tears to wash away particles. Full coverage protective eyewear is crucial for those exposed to UV radiation as it can prevent cataracts and other eye damages.
Step-by-step explanation:
The human eye is a sophisticated organ that not only provides the sense of sight but also offers protection against environmental threats. The bony orbits in the skull encase the eyeballs, offering structural protection, while various features like eyelids and eyelashes block foreign particles. The cornea, the transparent front layer, not only aids in focusing light but also serves as a barrier against injury and intense light. An additional protective measure is the lacrimal system, which produces tears to wash away irritants and moisturize the eye.
For those who might be exposed to ultraviolet radiation, wearing full coverage protective eyewear is key since UV exposure can lead to cataracts, a condition that clouds vision. Materials like polycarbonate in plastic lenses block most UV radiation and offer better protection compared to glass lenses. Contact lenses can also provide extra protection for the retina by absorbing UV radiation.