Precaution while using Contact Lenses
A contact lens, or simply contact, is a thin lens placed directly on the surface of the eye.
1. What Are Contact Lenses
Contact lenses are medical devices worn directly on the cornea of the eye. Like eyeglasses, contact lenses help to correct refractive errors and perform this function by adding or subtracting focusing power to the eyes cornea and lens. Contacts provide a safe and effective way to correct vision when used with care and proper supervision. They can offer a good alternative to eyeglasses, depending on your eyes and your lifestyle. Over 24 million people in the United States now wear contact lenses. For certain conditions, contact lenses may be considered medically necessary.
2. Types of Contact Lenses
These are the most common type of contact lenses currently prescribed. These lenses are made materials that incorporate water, which makes them soft and flexible and allows oxygen to reach the cornea. 1Daily disposable lenses: Although generally more expensive, they carry a lower infection risk. Two week or monthly disposable lenses: for daily wear. 2Toric contact lenses: Correct moderate astigmatism. Bifocal contact lenses: can be helpful for patients that need reading and distance correction but may not be right for everyone.
These lenses are also known as RGPs. They are rigid or hard lenses made of plastics combined with other materialssuch as silicone and fluoropolymersthat allow oxygen in the air to pass directly through the lens. For this reason, they are called gas permeable.
4. Risk Factors
Dailywear lenses should never be worn as extendedwear lenses. Misuse can lead to temporary and potentially sight threatening damage to the cornea. People who wear any type of lens overnight have a greater chance of developing infections of the cornea. These infections are often due to poor cleaning and lens care. Improper over wearing of contact lenses can result in intolerance, leading to the inability to wear contact lenses.
5. Gas permeable lenses
Gas permeable lenses can potentially scratch the cornea if the lens does not fit properly or if the lens is worn while sleeping. They are also more likely to slide off the cornea and become hidden under the lid. Gas permeable lenses traditionally had a reputation for popping out of the eye. Newer lens designs have minimized the chance of losing a contact even during vigorous exercise.
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