Glossary
Searchable terminology from accessibility, web standards, and related fields.
34 results found in visual accessibility.
- Private Visual Content (PVC, Visual Privacy)
- Private visual content (PVC) refers to visual information in images or videos that the person depicted or sharing the content considers private and would not want publicly disclosed. For people who ar…
- Relative Font Sizing (Relative Units, Scalable Typography, Flexible Font Sizes)
- The practice of specifying text sizes using relative units (such as em, rem, or percentages) rather than absolute units (such as pixels or points), allowing text to scale when users adjust their brows…
- Remote Assistance (Remote Sighted Assistance, Visual Interpreting)
- A service model where people who are blind or have low vision connect with sighted volunteers or trained agents via a live video call to receive real-time visual descriptions and guidance. Services li…
- Scotopic Sensitivity Syndrome (Irlen Syndrome, Visual Stress, Meares-Irlen Syndrome)
- A perceptual processing condition in which the brain has difficulty handling certain visual information, particularly high-contrast patterns like black text on a bright white background. People with s…
- Screen Reader (Screen Reading Software)
- An assistive technology application that converts digital text and interface elements into synthesized speech or braille output, enabling people who are blind or have low vision to interact with compu…
- Shoreline Technique (Trailing, Edge Following)
- An orientation and mobility technique used by people who are blind or have low vision in which the traveler follows a consistent edge or boundary — such as the edge of a sidewalk, a wall, a fence line…
- Spatial Learning (Spatial Cognition, Environmental Learning)
- The process of acquiring and integrating information about an environment into cognitive maps — mental representations of spatial relationships between places, paths, and landmarks. For sighted indivi…
- Tactile Aid (Tactile Learning Aid, Tactile Tool)
- A physical object designed to convey information through touch, used to make visual or abstract concepts accessible to people who are blind or have low vision. Tactile aids can include raised-line dra…
- Tactile Image (Tactile Graphic, Tactile Picture, Touch Image)
- A tactile image is a raised or textured representation of a visual image designed to be perceived through touch rather than sight. Tactile images can be produced through various methods including embo…
- Tactile Markers (Bump Dots, Tactile Labels, Braille Labels)
- Physical indicators such as raised dots, textured stickers, or braille labels applied to objects, appliances, and controls to make them identifiable by touch for people who are blind or have low visio…
- Teachable Object Recognizer (Teachable Machine, Personalized Object Recognizer)
- A machine learning application that allows end users to train custom object recognition models by providing their own example images, rather than relying on pre-trained models with fixed categories. I…
- Useful Field of View (UFOV, Functional Visual Field)
- The useful field of view (UFOV) is the area of the visual field from which a person can extract information in a single glance without moving their eyes or head. Unlike the anatomical visual field, th…
- Visual Dialogue (Visual Dialog, VisDial)
- Visual dialogue is an AI task that involves holding a multi-turn natural language conversation about visual content such as an image or video frame. Unlike single-turn visual question answering (VQA),…
- Visual Interpreter (Visual Interpreter Service, Visual Description Service, VIDS, Remote Sighted Assistance)
- A visual interpreter or description service (VIDS) is a technology or human-powered service that provides people who are blind or have low vision with descriptions of their visual surroundings, typica…