Choosing Glasses and Sunglasses
Your options for lenses refer to the specific type of vision correction the lenses offer – for example, multiple distances or task-specific. There are endless options that are right for you based on personal preference, lifestyle, prescription, and even job duties.
The various options and their benefits below will help you determine which lenses best suit your needs.
If you see clearly at a distance, but objects look blurry at close range, or vice versa, single-vision lenses can help. These lenses are designed to correct either nearsightedness or farsightedness, but not both at the same time. The lenses’ power is the same throughout and determined by your eye care provider during your eye exam.
Single-vision lenses also include reading glasses and glasses that correct astigmatism. They are used most commonly by people under 40 who tend to need only one prescription. Wearers can choose from a wide variety of styles, treatments and materials, from lightweight, thin materials to scratch-resistant treatments.
Bifocal lenses contain two prescriptions in the same frame improving vision both for distance and up close. A thin, visible line divides the lenses into the two prescriptions. The lower portion corrects farsightedness, while the upper portion sharpens objects at a distance.
Trifocal lenses improve vision up close, far away, and at middle distances. The lenses are divided into three segments. Like bifocals, the top portion adjusts objects at a distance, while the bottom portion is used for reading and other near tasks. But trifocals have a distinct third section that allows wearers to see clearly from an intermediate distance—about arm’s length.
Progressive lenses use advanced technology to ensure sharp sight from any distance. Conventional bifocals and trifocals can cause images to “jump” as vision adjusts from far to near. Unlike bifocals and trifocals, which are divided by visible lines, progressive lenses are completely seamless, eliminating this distracting effect, which is especially helpful for people with presbyopia. Progressive wearers can clearly see objects near, far, and in between, without a noticeable transition.
Computer glasses have different features that can help prevent the headaches and light sensitivity that people who spend long hours staring at a monitor often experience. The lenses often contain one or more of the following features:
- slight magnification
- anti-reflective treatment
- high-energy visible (HEV) light or blue light filter