People choose to wear contact lenses for many reasons. Aesthetics and cosmetics are often motivating factors for people who would like to avoid wearing glasses or would like to change the appearance of their eyes. Other people wear contacts for more visual reasons. When compared with spectacles, contact lenses typically provide better peripheral vision, and do not collect moisture such as rain, snow, condensation, or sweat. This makes them ideal for sports and other outdoor activities.
The prescribing of contact lenses is restricted to eye-care practitioners (Optometrists and Ophthalmologists
The many types of contact lenses currently available can be grouped in various ways according to:
- Wearing schedule
- Design of the lens
Contact lenses are small prescription lenses, worn in “contact” with the eye. They are designed to correct refractive errors and maintain ocular health. … They do, however, function much like regular eye glasses—refracting and focusing light so that objects appear clearly.
Corrective contact lenses are designed to improve vision. Conditions correctable with contact lenses are myopia (shortsightedness), hypermetropia (farsightedness), astigmatism and presbyopia.
A cosmetic contact lens is designed to change the appearance of the eye. These lenses are available with or without prescription and carry the same risk of complications as any other contact lens.
It is for this reason that even zero-powered lenses are classified as medical devices and a contact lens examination is essential before first use.
Contact lenses may be used in the management and treatment of various disorders of the eye. For example, a bandage contact lens is used to prevent the eyelid rubbing against an injured or diseased cornea.
Daily Wear lenses are designed to be removed prior to sleeping.
Extended Wear lenses can be worn overnight, usually for 6 or more nights. These lenses can be worn for such long periods of time because of their high oxygen permeability to the cornea, which allows the eye to remain healthy even when the eyelid is closed. However, Extended lens wearers may have an increased risk for corneal infections and corneal ulcers, primarily due to poor care and cleaning of the lenses, tear film instability, and bacterial stagnation.
Contact Lens Problems
People react differently to various lens materials and cleaning solutions. In most cases, if a problem develops, a change in lens type, material or cleaning solution is all that is needed to provide comfort, good vision and healthy eyes.
If you experience any discomfort, remove your lenses and consult your Optometrist.