The Basics of Eyeglasses
Eyeglasses have become quite popular as fashion accessories. Many people change their frames to match their wardrobes. Your appearance, personal taste and lifestyle should all be considered when choosing eyeglasses.
Advances in Eyeglass Lenses
You also have many options when choosing the lenses for your eyeglasses. Among the most popular types of lenses and lens options prescribed today are:
- Aspheric lenses have a slimmer, more attractive profile than other lenses. They also eliminate that magnified, “bug-eye” look caused by some prescriptions.
- High index lenses are made of new materials that enable the lenses to be noticeably thinner and lighter than regular plastic lenses.
- Wavefront technology lenses are custom fabricated based on precise measurements of the way light travels through your eye, allowing for excellent clarity.
- Polycarbonate lenses are thinner, lighter and up to 10 times more impact-resistant than regular plastic lenses. These lenses are great for safety glasses, children’s eyewear, and for anyone who wants lightweight, durable lenses.
- Photochromic lenses are sun-sensitive lenses that quickly darken in bright conditions and quickly return to a clear state in ordinary indoor lighting.
- Polarized lenses diminish glare from flat, reflective surfaces (like water) and also reduce eye fatigue.
- Anti-reflective coatings are among the most popular add-ons for lenses. They can dramatically improve the look and comfort of your glasses by minimizing the amount of light that reflects off the surface of your lenses, which also has the added benefit of reducing glare and thus easing eye fatigue.
- Other lens coatings include scratch-resistant, ultraviolet treatment, and mirror coatings.
Eyeglass Lenses for Presbyopia
Presbyopia is the normal, age-related loss of near focusing ability that makes reading and other close-up tasks more difficult after age 40.
Multifocal eyeglass lenses available for presbyopia correction include:
- Bifocals. Lenses with two powers – one for distance and one for near – separated by a visible line.
- Trifocals. Lenses with three powers for seeing at varying distances – near, intermediate and far – separated by two visible lines.
- Progressive lenses. These lenses have many advantages over bifocals and trifocals because they allow the wearer to focus at many different distances, not just two or three. Because they have no lines, progressive lenses allow a smooth, comfortable transition from one distance to another.
- Variable focus lenses. These innovative new multifocal lenses offer a larger field of view than conventional bifocals, trifocals and progressive lenses and can easily be adjusted to give you the power you need for any task.
If you see well in the distance without the need for eyeglasses, then simple reading glasses with single vision lenses may be all you need to deal with near vision problems caused by presbyopia.
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