Contact Lens

Contact Lens

• Overview //
• Care

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. Contact lens wearers can also wear sunglasses, goggles, or other eyewear of their choice without having to fit them with prescription lenses or worry about compatibility with glasses. Additionally, there are conditions such as keratoconus and aniseikonia that are typically corrected better by contacts than by glasses.

Contact lenses can be classified in many different ways. Contact lenses can be separated by their primary function, material, wear schedule (how long a lens can be worn before removing it), and replacement schedule (how long before a lens needs to be discarded).

• Contact lens prescriptions: Prescriptions for contact lenses and glasses may be similar, but are not interchangeable. While every country is different, the prescribing of contact lenses is usually restricted to various combinations of ophthalmologists, optometrists and opticians. An eye examination is needed to determine an individual's suitability for contact lenses. This typically includes a refraction to determine the proper power of the lens and an assessment of the health of the anterior segment of the eye. Many eye diseases can prohibit contact lens wear, such as active infections, allergies, and dry eye.Keratometry is especially important in the fitting of rigid lenses.