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Vision Impairment and Blindness
Reviewed by Medicinsk Expert•Last updated: 2026-10-22•Eyes Vision

Vision Impairment and Blindness

Vision impairment ranges from low vision to total blindness, and while lost sight cannot be restored, it can be managed through rehabilitation and assistive devices.

What is vision impairment?

Vision impairment is the loss of vision. It includes blindness (the loss of all or most sight) and low vision (having some vision, but enough loss to make everyday activities like reading, shopping, or cooking difficult). Low vision cannot be fixed with glasses, contact lenses, medicine, or surgery.

Causes

While aging does not cause vision loss on its own, many diseases common in older adults can. Leading causes include age-related eye diseases such as macular degeneration, cataracts, and glaucoma. Other causes include eye disorders, injuries, and birth defects.

Diagnosis

Vision impairment is diagnosed with a dilated eye exam. Early warning signs include difficulty performing everyday tasks, recognizing faces, distinguishing colors, or seeing screens clearly, even when wearing corrective lenses.

Types of Low Vision

  • Central vision loss: Inability to see things in the center of your vision.
  • Peripheral (side) vision loss: Inability to see things out of the corners of your eyes.
  • Night blindness: Inability to see in low light.
  • Blurry or hazy vision.

Treatment & Rehabilitation

Low vision is permanent, but treatment can help you manage your remaining sight. Vision rehabilitation teaches you how to live with vision loss, including:

  • Using magnifying devices or screen readers
  • Setting up your home for easier navigation
  • Employment and job training
  • Using assistive devices like lighting and reading stands

Making the Most of Remaining Sight

If you have some vision, providers may suggest:

  • Magnifiers
  • Telescopic glasses or monoculars
  • Large print books and clocks with larger numbers
  • Brighter lights
  • Anti-glare sunglasses or shields

If you have no vision (blindness), resources include text-reading software and braille books.

Prevention

You can help protect your vision by:

  • Having regular comprehensive eye exams
  • Wearing sunglasses and protective eyewear
  • Maintaining a healthy weight and diet
  • Getting regular physical activity
  • Quitting smoking

Frequently Asked Questions

Clinicians assess functional vision by observing how a patient performs activities of daily living that cannot be corrected with standard lenses. This includes testing the ability to read standard print, recognize faces at a distance, navigate unfamiliar environments, and perform fine motor tasks like threading a needle or handling small coins. If a patient struggles with these tasks despite wearing their best corrective lenses, it indicates low vision. The diagnosis is further confirmed by a dilated eye exam to rule out treatable conditions like cataracts or refractive errors.
For central vision loss, where the center of the visual field is damaged but peripheral vision remains intact, high-contrast tools and magnification are key. Electronic magnifiers (CCTVs) are highly effective as they project enlarged images onto a screen, allowing for comfortable reading of documents and screens. High-contrast clocks, large-print books, and bold-colored utensils help with daily tasks. Additionally, using a monocular or telescopic lens can help focus on specific objects in the center of the visual field, while lighting adjustments, such as using task lamps with high lumen output, can significantly improve readability.
Standard optometry and ophthalmology focus on diagnosing and treating eye diseases and correcting refractive errors using glasses, contacts, or surgery. Vision rehabilitation, on the other hand, is a specialized service provided by low vision specialists, occupational therapists, and orientation and mobility instructors. It focuses on maximizing the use of remaining vision through training in the use of assistive devices, such as magnifiers and screen readers, and teaching strategies to adapt to vision loss. It also includes training in independent living skills, such as safe travel, cooking, and managing household tasks with reduced sight.
Yes, many individuals with total blindness maintain successful careers through the use of assistive technology and specialized training. Jobs that rely on auditory, tactile, or verbal skills are often accessible, such as software development, audio production, counseling, law, and teaching. Screen readers and braille displays allow blind individuals to interact with computers and digital documents efficiently. Many employers now offer reasonable accommodations, and organizations like the National Federation of the Blind provide job coaching and networking opportunities to help blind individuals find and maintain employment in various fields.
Source: MedlinePlus, National Library of Medicine

MedlinePlus brings together authoritative health information from the National Library of Medicine (NLM), the National Institutes of Health (NIH), and other government agencies and health-related organizations.

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