Eye protection protects the wearer's  eye from  chemical splashes, laser radiation and/or flying debris. Face protection is achieved by wearing face shields. These shields extend from the eyebrows to below the chin and across the width of the wearer's head.  Face shields protect against potential splashes or sprays of hazardous liquids.

The employee who wears prescription lenses while engaged in operations that involve eye hazards must wear eye protection that incorporates the prescription in its design, or wear the safety eyewear that can be worn over the prescription lenses without disturbing the position of the prescription lenses

Yes, they can. As there are safety spectacles especially designed for people who wear prescription glasses.

Yes. You may do this. However, you must disinfect shared protective eyewear after each use. If the goggles or spectacles do not have to be individually designed to incorporate an employee's corrective lenses and you disinfect the eyewear between uses by different employees, more than one employee may use the same set of protective eyewear.

The best defence against eye injuries is to prevent them. Ninety percent of trauma-related blindness can be prevented by using simple precautions, such as using protective eyewear. You need to protect your eyes from the sun as well. Use sunglasses whenever going outside, even when the sky is overcast.

Workplace eye protection is needed in the case of the following potential eye hazards: Projectiles (dust, concrete, metal, wood and other particles), Chemicals (splashes and fumes), Radiation (especially visible light, ultraviolet radiation, heat or infrared radiation, and lasers), Bloodborne pathogens from blood and body fluids. 
Occupations with a high risk for eye injuries include: construction, manufacturing, mining, carpentry, auto repair, electrical work, plumbing. Welding, maintenance etc.

Three main types of eye protection exist, based on the area of application and usage. These are Safety eyewear, Goggles and Face Shields. Choose the one which is certified and provides the optimum level of protection.

The most common eye disease associated with near-infrared radiation is cataracts. Prolonged exposure to IR radiation causes a gradual but irreversible opacity of the lens. Other forms of damage to the eye from IR exposure include scotoma, which is a loss of vision due to damage to the retina. Even low-level IR absorption can cause symptoms such as redness of the eye, swelling, or hemorrhaging.

 Clean safety eye-wear with mild soap and water.Wash lenses with water before wiping. Store eye protection preferably in a clean dust-proof case o Replace the safety eyeear,  if lenses are scratched or pitted.