Glossary

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Relief Chart(also: 3D Chart, Haptic Chart, Relief Graph)

A tactile data visualization that uses height (the third dimension) to encode data values, making charts accessible to people with visual impairments through touch. Unlike flat tactile graphics that use only texture or raised lines, relief charts represent data magnitude through…

Remote Sighted Assistance(also: Remote Visual Assistance, Visual Interpreting, Remote Sighted Guide)

A service model in which a sighted person provides real-time visual information to a blind or visually impaired person remotely, typically through a smartphone video call. The blind user points their phone camera at what they need help with, and the sighted helper describes what…

Remote sighted assistance(also: RSA, Visual interpreting service)

A service connecting blind or visually impaired individuals with sighted helpers through live video calls, enabling real-time visual guidance for everyday tasks. Services like Be My Eyes (volunteer-based), Aira (professional agents), and similar platforms allow BVI users to…

Residual vision(also: Functional vision, Usable vision)

The remaining visual ability of a person with a visual impairment, which may include partial acuity, limited visual field, or light perception. The vast majority of people classified as legally blind have some residual vision rather than total blindness. Assistive technology and…

Restricted Field of View(also: Tunnel Vision, Peripheral Vision Loss, Visual Field Loss)

A condition in which the area of the visual environment that a person can see at any given moment is significantly reduced, often described as looking through a tunnel or a narrow tube. Restricted field of view can result from conditions such as glaucoma, retinitis pigmentosa,…

Retinitis Pigmentosa(also: RP)

A group of inherited genetic disorders that cause progressive degeneration of the retina, typically beginning with loss of night vision and peripheral vision and potentially leading to tunnel vision or complete blindness. RP affects the rod photoreceptor cells first, then may…

Retinitis Pigmentosa(also: RP, Retina Pigmentosa, Rod-Cone Dystrophy)

A group of inherited genetic disorders that cause progressive degeneration of the retina, leading to gradual vision loss. Initial symptoms typically include difficulty seeing in low light (night blindness) and loss of peripheral vision (tunnel vision). The condition often begins…

Retinitis pigmentosa(also: RP)

A group of inherited genetic disorders that cause progressive degeneration of the retina, typically beginning with loss of night vision and peripheral vision and gradually narrowing the visual field (tunnel vision) over years or decades. Some people with RP eventually lose most…

Retinopathy(also: Diabetic Retinopathy, Retinal Disease)

A group of eye conditions affecting the retina that can cause vision loss or blindness. Diabetic retinopathy, caused by damage to blood vessels in the retina due to diabetes, is one of the leading causes of blindness in working-age adults. Symptoms may include blurred vision,…

Retinopathy of Prematurity(also: ROP)

An eye condition that can occur in premature infants when abnormal blood vessels grow in the retina. In severe cases, these vessels can cause scarring, retinal detachment, and significant vision loss or blindness. ROP is one of the leading causes of childhood blindness and low…

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