Glossary
Searchable terminology from accessibility, web standards, and related fields.
6660 terms — page 175 of 333
- Low Vision (Partial Sight, Partially Sighted)
- A visual impairment that cannot be fully corrected by glasses, contact lenses, medication, or surgery, but where some usable vision remains. Low vision encompasses a wide range of conditions and sever…
- Low and Middle Income Countries (LMICs, Developing Countries, Global South)
- A World Bank classification for countries with gross national income per capita below a defined threshold, encompassing low income and lower-middle income economies. In accessibility contexts, LMICs p…
- Low vision (Partial sight, Visual impairment)
- 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 …
- Low- and Middle-Income Countries (LMIC, LMICs, developing countries, Global South)
- Countries classified by the World Bank as having lower gross national income per capita, typically facing greater resource constraints in healthcare, education, and technology infrastructure. In acces…
- Low-Barrier Access (Low-Barrier Technology)
- Technology or services designed to minimize obstacles to initial use, including cost, setup complexity, training requirements, and technical prerequisites. Low-barrier access is particularly important…
- Low-Fidelity Prototype (Low-Fi Prototype, Lo-Fi Prototype, Paper Prototype)
- A rough, inexpensive representation of a design - typically paper sketches, cardboard models, or wireframes - used early in the design process to explore concepts without investing in polished artefac…
- Low-Fidelity Prototyping (Lo-Fi Prototyping, Paper Prototyping)
- A design method that uses simple, inexpensive materials to create quick, rough representations of a product or interface for early-stage testing and feedback. Traditional lo-fi prototyping relies heav…
- Low-Functioning Autism (LFA, Classic Autism, Level 3 Autism)
- A descriptor historically used to characterize individuals with autism spectrum disorder who have significant support needs, including limited or no verbal communication, intellectual disability, and …
- Low-Incidence Disability (Low-Prevalence Disability)
- A disability that occurs relatively rarely in the general population, such as blindness, deafblindness, or certain developmental conditions. Low-incidence disabilities present unique challenges for re…
- Low-Resource Setting (Resource-Limited Setting, Resource-Constrained Environment)
- A context characterized by limited financial resources, infrastructure, trained professionals, and technological capacity that affects the availability and sustainability of services including healthc…
- Low-Resource Sign Language
- A sign language for which standardised corpora, training data, technical infrastructure, and institutional support are limited compared to 'high-resource' sign languages like American Sign Language (A…
- Low-Tech AAC (No-Tech AAC, Unaided AAC)
- Augmentative and alternative communication methods that require no or minimal technology, including communication boards, picture cards, letter boards, eye-pointing frames, sign language, and gestures…
- Low-Tech Accessibility (Low-Tech Accommodations, Low-Tech Solutions)
- Accessibility solutions that use simple, inexpensive materials and methods rather than advanced technology to support people with disabilities in completing tasks. Examples include tactile guides made…
- Low-Vision Rehabilitation (LVR, Vision Rehabilitation)
- A multidisciplinary service aimed at helping individuals with reduced vision regain functional independence in daily life. LVR combines assistive technologies, guided training sessions, and adaptive s…
- Low-Vision Therapist (LVT, Low-Vision Specialist, Vision Rehabilitation Therapist)
- A certified professional who works with people with low vision to develop adaptive strategies for daily living, optimize use of residual vision, and provide training with assistive devices. LVTs are p…
- Lower Limb Impairment (Lower Extremity Impairment, Lower Body Impairment)
- Reduced function in one or both legs or feet due to conditions such as amputation, paralysis, muscular disorders, or joint conditions. In VR accessibility, lower limb impairment primarily affects loco…
- Lubben Social Network Scale (LSNS, LSNS-6)
- A validated screening instrument used to assess social isolation risk in older adults by measuring the size and closeness of their social networks. The abbreviated LSNS-6 version contains six items co…
- Luminance (Relative Luminance)
- The relative brightness of a color as perceived by the human eye, measured on a scale from 0 (black) to 1 (white). In accessibility, relative luminance is the foundation of WCAG color contrast ratio c…
- Luminance Contrast (Brightness Contrast)
- The difference in perceived brightness between two adjacent surfaces or objects, as opposed to color contrast which involves differences in hue. Luminance contrast is particularly important for people…
- Luminous Efficiency Function (LEF, Spectral Luminous Efficiency Function, V(lambda))
- A function that describes how the human visual system converts light intensity at different wavelengths into perceived brightness. The standard LEF used in WCAG contrast ratio calculations is based on…