Final Review - Vision Flashcards
Visual Perception Hierarchy
Oculomotor control/Visual Fields/Visual acuity, Attention, Scanning, Pattern recog, Visual Memory, Visuocognition, Adaptation through vision
Visual Acuity
Ability for the eyes to make what is seen sharp and clear (20/20 - top is what you see, bottom is norm)
(Snellen chart)
Visual Field
Area that is seen when viewing environment Superior: 60 Inferior: 75 Nasal: 60 Peripherial: 100 (Confrontation; Lighthouse/Anchoring)
Occulomotor Control
Ability for the eyes to move smoothly together in a coordinated manner, ability to focus, produce one image
(Diplopia - Convergence, saccades, pursuits)
Visual Scanning
Ability for the eyes to focus and perceive the environment systematically to gather information through saccadic (quick/back and forth) eye movement
(Nystagmus - eyes oscillating very quickly w.o control & Strabizmiss - misalignment of eyes & Neglect [attn deficit])
Visual Cognition
Mental flexibility and ability to integrate visual feedback with other sensory info to make decisions, problem solve and plan
Ex: Stop sign = stop
L CVA
Right hemi, aphasia, apraxia (Ideomotor: knows what asking but cant initiate/sequence [can be automatic]; Ideational: does not understand)
R CVA
Left hemi, vision probs, poor insight/judgment, impulsive
Amblyopia
Visual acuity is less than 20/20
Foeva
Part of the retina that contains the area for the most acute vision
Scatoma
An isolated area of absent vision or depressed sensitivity in the visual field - surrounded by an area of normal vision (Diabetic retinopathy)
Suppression
Condition usually associated with strabismus/amblyopia in which visual system ignores input from one eye (literally just ignore it but not blind)
Occlusion
Blocking of one eye; pirate patch
