Usage
Before touching the contact lens or the eye, it is important to wash hands thoroughly with soap and rinse well with water . Soaps that contain moisturizers or potential allergens should be avoided as these can cause irritation of the eye. Next the lens should be cleaned, rinsed, and inspected for defects.
Care should be taken to ensure that soft lenses are not inside-out. The edge of a lens that is inside out will have a different appearance, especially when the lens is slightly folded. Insertion of an inside-out lens for a brief time (less than one minute) should not cause any damage to the eye, but the discomfort will help identify that the lens is not in the proper orientation. Some brands of lenses have markings that make it easier to tell the front of the lens from the back.
The technique for removing or inserting a contact lens varies depending upon whether the lens is soft or rigid. There are many subtle variations to insertion and removal techniques. Because of differences in anatomy, manual dexterity, and visual limitations, every person must find the technique that works best for them. In all cases, the insertion and removal of lenses requires some training and practice on the part of the user.
Read more about this topic: Contact Lens
Famous quotes containing the word usage:
“Girls who put out are tramps. Girls who don’t are ladies. This is, however, a rather archaic usage of the word. Should one of you boys happen upon a girl who doesn’t put out, do not jump to the conclusion that you have found a lady. What you have probably found is a lesbian.”
—Fran Lebowitz (b. 1951)
“...Often the accurate answer to a usage question begins, “It depends.” And what it depends on most often is where you are, who you are, who your listeners or readers are, and what your purpose in speaking or writing is.”
—Kenneth G. Wilson (b. 1923)
“I am using it [the word ‘perceive’] here in such a way that to say of an object that it is perceived does not entail saying that it exists in any sense at all. And this is a perfectly correct and familiar usage of the word.”
—A.J. (Alfred Jules)