Low Vision Flashcards
Blindness is defined as…
Best-corrected visual acuity of 6/60 (20/200) or worse in the better seeing eye
Visual perceptual hierarchy (7)
Organized hierachy of processes that interact with and subserve each other
- Visual acuity
- Visual field
- Oculomotor control
- Visual attention
- Pattern recognition
- Visual memory
- Visuocognition
Myopia
Nearsightedness
Hyperopia
Farsightedness
Presbyopia
“Difficulty focusing on near objects”
Common age related change in adults over age 50
Lens of the eye becomes less flexible, reducing the ability to read small print
The central visual field encompasses…
20 degrees of vision
Oculomotor control is…
The ability of the eyes to move smoothly and in a coordinated manner through full range of motion, provides binocular vision
Accommodation for ocular motor control is…
The ability to adjust focus of vision at difference distances (change focus from near to far quickly)
Convergence is…
The muscle action of the eyes that moves them inward (in adduction) to allow focusing on nearby objects
Diplopia is…
Perception of two images of a single object caused by one parietic eye
Exophoria vs. Esophoria
Both are related to eye deviations that are not noticeable during focus on an object
Exo: eye turns out when the client is no focusing on an object
Eso: the eye turns in when the client is not focusing on an object
Visual attention is…
The ability to identify specific features of an object and ignore other irrelevant sensory information
Pattern recognition is…
The ability to identify the configuration and holistic aspects of an object as well as specific features of the object
Visual memory is…
The mental manipulation of visual stimuli, requiring the ability to create and retain a picture of the object which visual analysis is complete
Visuocognition is..
The ability to manipulate and integrate visual input with other sensory information
Age Related Macular Degeneration impacts ____ vision
Central vision
Sensitive to glare/light changes
Glaucoma impacts ___ vision which impacts ______
Peripheral vision (think tunnel vision) Functional mobility
Diabetic Retinopathy is caused by…
…changes in the blood vessels of the retina (leaking , swelling, abnormal growth) - think squid ink on the screen
Can lead to retinal scarring and detachment
Cataracts occur when…
the lens of the eye becomes opaque or clouded (fixable with surgery)
Homonymous Hemianopsia is…
Type of vision loss following brain injury in which half of the visual field in each eye is lost (opposite field of injury and corresponds to sensorimotor deficit)
Oculomotor function provides ___ vision and deficits result in ____
Binocular vision
Diplopia
Diabetic retinopathy visual impairments look like…
Ink splotches on the screen
Low vision interventions should…(3)
Increase contrast
Decrease visual clutter
Eliminate glare
Visual acuity assessed with…
Snellen chart/Tumbling E chart (illiterate)
Lighthouse Near Visual Acuity Test
If a client is having difficulty with curbs and corners in low light, OTR should (intervention)
Increased contrast
