Low-Vision DevicesInstrumentos para la Visión Baja

Low-Vision Devices

Picture of equipment to assist the visually impaired

What is low vision?

Low vision is a condition that involves a minimal ability to see (particularly central vision) that is unresolved or uncorrected with traditional eyeglasses, contact lens, intraocular lens implants, or corrective surgery. However, in some cases, people with low vision may be aided with special visual devices.

What causes low vision?

There are a variety of different causes of low vision, including, but not limited to, the following:

  • Macular degeneration (the most common cause of low vision; involves damage to a person's central vision making it difficult to read, drive, or perform other daily activities that require fine, central vision)

  • Aging (Aging is a risk factor for low vision. However, people of any age may be affected.)

  • Congenital defects (present at birth)

  • Injury

  • Disease (including diabetes)

  • Other eye diseases (for example, glaucoma or cataracts)

What are the different types of low vision?

Picture of equipment to assist the visually impaired

Although, in most cases, people with low vision have disabled central vision (also called reading vision), there are other types of low vision that may include the following:

  • Disabled or partial peripheral vision

  • Disabled or partial color vision

  • Disabled or partial ability to adjust to different light settings

  • Disabled or partial ability to adjust to different contrasts

  • Glared vision

What are low-vision devices?

Because low vision cannot be improved by more traditional methods (such as, the use of eyeglasses or contact lenses) people with low vision often rely on the use of a number of different instruments, called low-vision devices, and tailored equipment for improved vision. Low-vision devices, categorized as either optical or nonoptical, help to improve visual ability for millions of people every day.

What are optical low-vision devices?

Simply stated, optical low-vision devices involve the use of one of many types of lenses to improve vision. For example:

  • Magnifying devices (such as, magnifying eyeglasses, hand magnifiers, magnifying lamps, or telescopic viewing devices)

  • Closed circuit television involves enlarged images, exaggerated contrasts, and adjustable magnification

What are nonoptical, low-vision devices?

Picture of a large-scale writing tablet for the visually impaired

Nonoptical, low-vision devices help bring images closer to the eyes. This may include the use of any, or all, of the following:

  • Larger print items (such as, magazines, newspapers, books, calendars, address books, cookbooks, dictionaries, games, playing cards, sheet music, or street signs)

  • Larger, illuminated watches and clocks

  • Writing guides

  • Instruments that provide voice instruction (for example, computers)

  • Instruments that provide voice information (for example, clocks, timers, calculators, scales, or key chains)

Today's Interactive Tools
Related Items

The third-party content provided in the Health Library of phoebeputney.com is for informational purposes only and is not designed to diagnose or treat a health problem or disease, or replace the professional medical advice you receive from your physician. If you or your child has or suspect you may have a health problem, please consult your primary care physician. If you or your child may have a medical emergency, call your doctor or 911 or other emergency health care provider immediately in the United States or the appropriate health agency of your country. For more information regarding site usage, please visit: Privacy Information, Terms of Use or Disclaimer.