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CL Types
The contact lens field is constantly changing, with new materials and solutions becoming available on a regular basis. The following is a quick summary of current contact lens types.
Soft contact lenses are made from a gel-like plastic with a high water content. They are larger than the rigid gas permeable lenses. The majority of patients wearing contact lenses use soft contact lenses.
Advantages:
 more comfortable; easier adaptation.
 seldom decenter or pop out.
 excellent for part-time or full-time wear.
 better than rigid lenses in dusty environments.
 can be purchased in multi-packs for frequent replacement.
Disadvantages:
 less durable.
 can absorb vapors and sprays.
Gas Permeable contact lenses are an improvement of the traditional hard lenses. The material allows oxygen to pass directly through the lens to more easily maintain good eye health.
Advantages:
 more durable than soft lenses.
 offer excellent visual correction, including correction for astigmatism.
Disadvantages:
 may at times be uncomfortable in dusty places.
 not as easy to adapt to as soft lenses.
Extended wear contact lenses can be either soft or gas-permeable, and are designed to be worn 24 hours each day. Many of these lenses are used as daily wear lenses with occassional overnight wear, but some lenses are worn for up to a week.
Advantages:
 don't require removal every night when sleeping.
 less solution expense.
Disadvantages:
 require more follow-up care.
 must be replaced more often.
 more risk of eye infections and ulcers.
Disposable contact lenses, by definition, are contact lenses that are never reused. True disposable lenses are thrown away when removed from the eye.
Frequent replacement lenses are contact lenses that are cleaned and reused, but thrown away after 2 to 4 weeks. Either type of soft contact lens may be daily or extended wear.
Advantages:
 Less solution eliminates problems associated with older lenses.
 multipacks provide spare lenses.
Disadvantages:
 overall cost may be somewhat higher.
Silicone contact lenses: The newest silicone lenses provide considerably more oxygen transmission than traditional soft lenses. This helps to keep eyes white, bright, and healthy.
Advantages:
 tremendous oxygen transmission - healthier corneas
Disadvantages:
 overall cost may be somewhat higher.
 lenses sometimes develop significant deposits (rarely a problem with 2 week replacement).
Toric contact lenses: People with astigmatism have the option of wearing either rigid or soft contact lenses. The newest astigmatism correcting soft lenses have more than one correction manufactured on the lens, and usually rely on gravity to maintain alignment.
Bifocal contact lenses: People who need different prescriptions for far and near vision have several contact lens options. Bifocal contacts have multiple corrections within one lens. Monovision corrects one eye for distance and the other for near. Modified monovision combines both the bifocal and monovision concepts.
Tinted contact lenses: Soft lenses may be manufactured with a handling, transparent, opaque, or party tint. A handling tint is not noticeable on the eye, but the lenses are easier to see when off the eye. A transparent tint may enhance the natural beauty of your eyes, but will not necessarily change your eye color. An opaque lens may be used to change your eye color. A party lens creates an unusual and striking appearance.
Custom contact lens tinting is available at West Branch Eyecare.
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