Low vision

A level of visual impairment that cannot be fully corrected with standard glasses, contact lenses, medication, or surgery, but retains some usable vision — distinguishing it from total blindness. Low vision encompasses a range of conditions affecting acuity, visual field, contrast sensitivity, and colour perception. People with low vision typically use a combination of assistive tools including screen magnifiers, large print, high contrast settings, and optical devices. Designing for low vision requires understanding that magnification alone is insufficient — interaction dynamics, spatial layout, contrast, and the detail-versus-context trade-off all significantly affect usability.