Vision & Low Vision

Vision loss ranges from mild low vision to total blindness, and it can be present from birth or acquired later in life through injury, illness, or aging. Assistive technology for vision differs widely depending on how much usable vision a person has, whether their vision loss is stable or progressive, and their personal goals for reading, writing, mobility, and daily tasks. This page is a general educational overview and does not replace an individualized evaluation by a qualified professional such as a low vision specialist, orientation and mobility specialist, or vision rehabilitation therapist.

BLINDNESS AND LOW VISION

"Low vision" generally describes vision loss that cannot be fully corrected with glasses, contact lenses, medication, or surgery, but that still leaves some usable vision. "Blindness" is often used for the absence of usable vision, though many people who identify as blind have some remaining light perception or peripheral vision. Common causes include macular degeneration, glaucoma, diabetic retinopathy, cataracts, and inherited retinal conditions, among many others. Because vision loss varies so much from person to person, tools and strategies are highly individual.

SCREEN READERS

A screen reader is software that converts on-screen text and interface elements into synthesized speech or refreshable braille output, allowing someone with little or no usable vision to operate a computer, phone, or tablet by listening rather than looking. Screen readers can read documents, websites, and applications, and they typically include commands for navigating by heading, link, or landmark rather than reading straight through every word. Learning a screen reader efficiently takes practice, and many users benefit from structured training.

MAGNIFICATION

Magnification tools enlarge text and images to a size that a person with low vision can see more comfortably. Options range from simple handheld or stand magnifiers to electronic video magnifiers (sometimes called CCTVs) that display an enlarged, high-contrast image on a screen, to built-in software magnification on computers and mobile devices. The right level of magnification, contrast, and field of view depends on the specific vision condition and the task, such as reading mail versus reading a whiteboard across a room.

VISUAL DISPLAY ADJUSTMENTS

Before adding specialized equipment, many devices already include adjustable settings that can help, such as larger text sizes, higher contrast color schemes, dark mode, reduced visual clutter, and cursor or pointer customization. Adjusting font, spacing, color, and brightness settings on a phone, computer, or e-reader is often a reasonable first step and can be combined with other tools described on this page.

ACCESSIBLE DOCUMENTS

Documents and websites are more usable for people with vision loss when they are built with accessibility in mind, for example using real headings instead of only bold text, providing text alternatives for images, using sufficient color contrast, and avoiding scanned image-only PDFs that a screen reader cannot read. Accessible document design benefits screen reader users, magnification users, and many other readers as well.

MOBILE ACCESSIBILITY

Smartphones and tablets include built-in accessibility features such as screen readers, magnification, and voice-based interaction, which many people with vision loss rely on daily. Mobile accessibility features often work across apps rather than requiring separate specialized software, and settings can typically be adjusted to an individual's needs and synced across devices signed into the same account.

BRAILLE TECHNOLOGY

Braille is a tactile reading and writing system based on raised dot patterns. Braille technology includes braille displays and notetakers, braille embossers that print braille on paper, and software that translates text to and from braille. Not everyone who is blind or has low vision reads braille, and the decision to learn braille is personal and often made together with a vision or education professional based on an individual's needs and goals.

REFRESHABLE BRAILLE

A refreshable braille display uses mechanical pins that raise and lower to form braille characters that change, or "refresh," as a person reads through digital text. These displays can connect to computers, phones, or tablets and are often used alongside a screen reader, giving a tactile reading option in addition to, or instead of, synthesized speech.

ACCESSIBLE EDUCATIONAL MATERIALS

Students with vision loss may need materials in accessible formats, such as braille, large print, audio, or electronic text compatible with a screen reader, sometimes called accessible educational materials (AEM). Timely access to accessible materials is often coordinated through a school's special education team, and planning ahead is important since converting materials into an accessible format can take time.

ENVIRONMENTAL CONSIDERATIONS

Lighting, glare, color contrast, clutter, and the layout of a room or workspace can all affect how well a person with low vision can see and move safely. Simple environmental changes, such as improved task lighting, reduced glare, and consistent organization of frequently used items, can complement assistive technology and sometimes reduce how much technology is needed for a given task.

RELATED RESOURCES

For an overview of the broader field, see Assistive Technology 101. For general guidance on matching technology to an individual's needs, see AT Assessment & Selection. For funding pathways, see Funding Assistive Technology. For individualized help from the nonprofit, visit AccessibilityClinic.org. For more detail on screen-reading software, see Screen Readers. For more detail on magnification and visual display options, see Screen Magnification and Visual Access. For more detail on braille technology, see Refreshable Braille and Braille Technology.