Glossary

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Low-Fidelity Prototype(also: 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 artefacts. Low-fidelity prototypes lower the barrier to critique and change, which is…

Low-Fidelity Prototyping(also: 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 heavily on visual methods such as sketches, storyboards, and paper mockups, which…

Low-Functioning Autism(also: 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 difficulty with daily living skills. The term is increasingly considered…

Low-Incidence Disability(also: 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 research, education, and technology development because affected individuals are…

Low-Resource Setting(also: 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 healthcare and assistive technology. Low-resource settings present unique challenges…

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 (ASL) or German Sign Language (DGS). Low-resource sign languages — such as Bangla…

Low-Tech AAC(also: 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 AAC is often more immediately accessible, sustainable, and…

Low-Tech Accessibility(also: 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 from tape or magnets on equipment, raised markings for orientation, notches…

Low-Vision Rehabilitation(also: 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 strategies tailored to each person's visual abilities and needs. Programs…

Low-Vision Therapist(also: 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 part of a multidisciplinary rehabilitation team that may include…

Lower Limb Impairment(also: 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 locomotion methods—free-roam VR requiring physical walking is inaccessible, while…

Lubben Social Network Scale(also: 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 covering family and friend networks, asking about the number of relatives and…

Luminance(also: 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 calculations, which compare the luminance of foreground text against its…

Luminance Contrast(also: 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 with low vision, as many have difficulty distinguishing colors but can detect…

Luminous Efficiency Function(also: 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 a "standard observer" with typical colour vision. However, people with CVD —…

Lynx

A text-only web browser that runs in terminal or command-line environments, displaying web content as plain text without images, JavaScript, or visual formatting. Developed in 1992 at the University of Kansas, Lynx was historically significant for web accessibility because its…