Refractive errors (problems focusing) are easily corrected with the proper eyeglasses. There are many types of lenses, including lens coatings, and frame designs to choose from.
Types of Eyeglasses
There are many types of eyeglasses to suit the needs of people needing particular vision correction.
- Single vision lenses are designed to correct distance vision such as near- and far-sightedness.
- Bifocals utilize the bottom half of the lens correction for reading and the upper half for seeing at a distance. Double-D bifocals, have included segments at the top for looking upward at objects in the near or intermediate range.
- Trifocals correct distance, intermediate, and near vision in the same lens.
- Progressive lenses have a smooth transition on the actual lenses for distance, intermediate, and near focal areas, rather than visible dividing lines. Since the transitional areas take up room the focal areas tend to be smaller.
- Reading glasses can be purchased over the counter at retail outlets, grocery stores, drugstores, and bookstores and are for seeing up close. Prescriptions can also be obtained for reading glasses.
Eyeglass Lens Materials
Eyeglass lenses today are mostly made of plastic. They are lighter, safer, and more flexible than actual glass. They also contain UV light-blocking abilities. Polycarbonate lenses are recommended for wearing eyeglasses during sports and any other activity that could possibly result in an injury of the eyes as the lenses are highly impact resistant. Trivex is a newer lens material that reduces distortion when compared to polycarbonate and may be preferred as an alternative material. “High index” lenses are recommended for patients with higher prescriptions.” As an alternate to polycarbonate, trivex (a newer material) is a available that is less distorting. For people who need high vision correction, “high index” lenses are recommended. These light plastic lenses have a much thinner profile, lowering the “Coke bottle” appearance that predominantly is associated with thick-lensed glass lenses.
Eyeglass Lens Protective Coatings
Protective coatings for eyeglasses are available to help you keep your eyes healthy. They have several benefits:
- Help lower reflections off the surface of the lenses, creating a more aesthetic appearance and help with eye contact
- Improving the sensitivity to contrast and reducing glare
- Protect your eyes from ultraviolet (UV) light
Sunglasses that feature both vision correction and UV protection are available. Also, photochromatic lenses which tint depending on light exposure are ideal for people who prefer one set for inside and outside activities.