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Low vision

Vision that cannot be fully corrected with glasses, so a person needs larger text, more contrast, or magnification.

Low vision describes sight that glasses or surgery cannot bring to the usual range. It includes blurred vision, loss of central or peripheral vision, and sensitivity to light. The World Health Organization estimates that at least 2.2 billion people have a near or distance vision impairment, and that most of them are over 50.

People with low vision use larger text, strong contrast, page zoom, screen magnifiers, and sometimes a screen reader. A page serves them when text is real rather than an image, contrast is high, layouts reflow when enlarged, and nothing depends on color alone.

Source

Blindness and vision impairment

World Health Organization, 2026. Checked .

Screen magnifier
Software that enlarges part of the screen so a person with low vision can read it.
Color contrast
The difference in brightness between text and its background, measured as a ratio that WCAG sets minimums for.
Reflow
A layout that rearranges into one column when the window is narrow or the page is zoomed, with no sideways scrolling.
Color vision deficiency
Difficulty telling certain colors apart, most often red and green, which is common and mostly inherited.

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