Contact lenses are not affected by perspiration. Contact lenses are less costly than spectacles. There are fewer lost contact lenses than spectacles. Some solvents can interact with materials of both hard and soft lenses. Lenses may discolor or cloud up when exposed to certain chemicals.
Soft lenses can dry out in winds and dry areas.
Some vapors and gases can be absorbed in lenses and cause irritation and damage. Some contact lenses prevent O 2 from reaching the eyes. Contact lens workers are at greater risk when working alone.