Glossary
The VISION trial uses a number of clinical terms to describe vision and visual field loss. This glossary explains them in plain language.
- Blind sight
- The ability to respond to certain visual stimuli within a perceptually blind area of visual field.
- Homonymous hemianopia
- Loss of half of the field of vision to one side in each eye. This is the condition studied in the VISION trial.
- Monocular vision
- Vision in one eye only.
- Peripheral vision
- The field of vision out to both sides.
- Prism
- An optical plastic membrane which displaces the images that are viewed through the prism.
- Quadrantanopia
- Loss of a quarter of the field of vision.
- Scotoma
- An isolated area of visual field loss.
- Visual field
- The whole of vision from straight ahead to the periphery, outwards.
- Visual impairment
- Vision loss resulting in a limitation of visual capability.
- Visual scanning
- Training that encourages an individual to systematically look to the right and to the left sides.
Related information
- RNIB, for information and support on sight loss
- Stroke Association, for information on stroke and its effects
- NHS, for an overview of stroke symptoms, causes and treatment
See how these terms apply in practice on the trial summary page, which shows what left and right homonymous hemianopia look like.