There are several types of eyeglasses designed to accommodate different vision challenges. The following article discusses single vision and bifocal glasses. OptiExpress provides comprehensive eye exams, contact lens fittings, a gallery of designer frames, and a one-hour onsite lab.
What is the difference between common types of lenses? Here is an explanation of single vision and bifocal lenses.
Single Vision Lenses
By far the most common type of corrective eyeglasses, this category offers correction for a single prescription throughout the whole lens. The correction may be either for myopia (nearsightedness) or hyperopia (farsightedness). Reading glasses – prescription or over-the-counter – are also single vision.
While many people wear more than one pair of single vision glasses – one for driving and another for reading, for example – it may be more efficient and convenient to wear bifocal lenses, which address more than one vision issue.
Bifocal lenses are lenses with two visual fields: one for distance viewing and another for close-viewing. It can be a challenge to adjust to bifocals, because there is a clear line of demarcation across the two lenses, which causes what’s known as an “image jump,” where objects suddenly appear dramatically closer when the eye travels slightly downwards. It is recommended that bifocal wearers wear their lenses as much as possible to get used to the visual field.
Bifocal lenses have the reputation for being the standard corrective eyewear for older adults, because they generally address presbyopia in addition to other vision issues. Presbyopia is the term that describes adult-onset farsightedness that makes reading difficult. Bifocals often have a viewing area specifically for reading.
In addition to single vision and bifocal lenses, there are other corrective lens options that address particular vision issues, which we’ll discuss in part two. If you need corrective lenses and live in the South Florida region, OptiExpress offers full eye exams, a gallery of designer eyewear, and a one-hour onsite lab. Please don’t hesitate to visit our Cape Coral or Ft. Myers eye care center for a comprehensive eye test.
OptiExpress founder Dr. J. Michael Witherington has been one of Ft. Myers’s most respected optometrists for more than twenty years. To book an eye exam at our Ft. Myers or Cape Coral location, please visit our contact page.