Glossary
Searchable terminology from accessibility, web standards, and related fields.
34 results found in visual accessibility.
- Accessible Comics (Digital Comics Accessibility, Comic Book Accessibility)
- Approaches and technologies for making comic books and graphic novels accessible to people with visual impairments. Unlike plain text, comics combine visual art, panel layouts, speech balloons, and on…
- Achromatopsia (Rod Monochromacy, Total Color Blindness, Complete Achromatopsia)
- A rare inherited vision condition in which a person has little or no ability to perceive color, seeing the world primarily in shades of grey. People with achromatopsia typically also experience light …
- Art Accessibility (Artwork Accessibility, Cultural Accessibility)
- The practice of making visual art, museums, galleries, and cultural experiences accessible to people with disabilities. Art accessibility encompasses a range of approaches including tactile reproducti…
- Blind and Low Vision (BLV, Vision Impairment, Visual Impairment)
- A broad term encompassing the spectrum of vision loss from partial sight (low vision) to complete blindness. People who are blind or have low vision experience varying degrees of visual function, and …
- Bone Conduction Headset (Bone Conduction Headphones, Bone Conduction Audio)
- An audio device that transmits sound vibrations through the bones of the skull directly to the inner ear, bypassing the outer and middle ear and leaving the ear canal open. For people who are blind or…
- Brightness Contrast (Luminance Contrast, Perceived Brightness Difference)
- The difference in perceived brightness between two colors, typically between text and its background. Brightness contrast is a key factor in readability, especially for people with low vision, color v…
- Camera Framing (Photo Framing, Object Framing)
- The act of positioning a camera so that the intended subject is properly captured within the image frame — not cropped, not too small, and centered enough for clear identification. Camera framing pres…
- Choropleth Map (Thematic Map, Shaded Map)
- A type of thematic map in which geographic areas are shaded or patterned in proportion to a statistical variable, such as population density, income level, or unemployment rate. Darker or more intense…
- Color Theory (Colour Theory)
- A body of principles and guidelines for understanding how colors interact, combine, and affect perception. In accessibility contexts, color theory is important for ensuring sufficient contrast ratios,…
- Convergence Insufficiency (CI)
- A binocular vision disorder in which the eyes have difficulty turning inward (converging) to focus on nearby objects, causing symptoms such as double vision, eye strain, headaches, difficulty reading,…
- Crowd Accessibility (Crowdsourcing for Accessibility, Human-Powered Access Technology)
- An approach that combines human intelligence with machine intelligence to create accessible content and services for people with disabilities. In crowd accessibility, micro-tasks that automated system…
- Daltonization (Recolouring, Color Remapping)
- Daltonization is a computational technique that modifies the colours in an image or on a screen to make them more distinguishable for people with colour vision deficiency (CVD). Named after John Dalto…
- Data Descriptor (Training Data Descriptor)
- An automated metric or feedback mechanism that characterizes the quality or properties of a dataset, particularly training images used in machine learning. In accessibility research, data descriptors …
- Diagram Accessibility (Accessible Diagrams, Scientific Diagram Accessibility)
- The practice of making visual diagrams — including scientific figures, flowcharts, organizational charts, and technical schematics — accessible to people with visual impairments, learning disabilities…
- Font Size (Text Size, Type Size, Point Size)
- The measurement of how large characters in a typeface are displayed, typically expressed in points (pt), pixels (px), or relative units (em, rem). Font size is a critical accessibility concern because…
- Instance-Level Recognition (Instance Recognition, Fine-Grained Recognition)
- A computer vision task that involves distinguishing between specific individual objects within the same general category, rather than just identifying broad categories. For example, while category-lev…
- Large Print (Large Type, Enlarged Print, Giant Print)
- Text or graphic material produced in a larger-than-standard font size to improve readability for people with low vision. Large print typically uses font sizes of 16 to 18 points or larger, though indi…
- Lip-reading (Speechreading, Speech Reading, Visual Speech Perception)
- The practice of understanding speech by visually interpreting the movements of the lips, face, and tongue, often used by deaf and hard-of-hearing individuals as a communication strategy. Lip-reading r…
- Non-Visual Navigation (Eyes-Free Navigation, Non-Visual Wayfinding)
- Strategies and technologies that enable people who are blind or have low vision to navigate physical environments without relying on visual information. Non-visual navigation uses a combination of tac…
- Orthographic Projection (Parallel Projection)
- A method of representing a three-dimensional object in two dimensions by projecting its features onto a flat plane using parallel lines perpendicular to that plane, eliminating perspective distortion.…