Neural deficits resulting in low vision

Question 1

Neural Deficits Resulting in Low Vision

Answer 1

• Cerebrovascular Accident (CVA)

- Traumatic Brain Injury (TBI)

Question 2

Visual Impairment as a Result of Neurological Conditions

Answer 2

• Hemianopsia or quadrantanopsia
• Diploplia
• Sensitivity to Light
• Visual Field Impairments
• Unilateral Neglect
• Photosensitivity
• Difficulty with light/dark adaptation
• Deficits in scanning, saccades, and pursuits
• Difficulty tolerating complex visual environments
• Deficits in depth perception
• Eye strain

Question 3

Stroke

Answer 3

Visual Deficits

• Eye alignment, visual fields, visual attention
• Hemianopia and quadrantanopia
• Hemi-attention
• Visual processing and neglect
• As many as 11 million sufferers

Question 4

Hemi-Inattent

Answer 4

• Loss of ability to attend, respond, react to sensory stimuli
• Differs from visual field deficit

Question 5

3 features of Hemi-Inattent

Answer 5

• Alertness and attention
• Spatial bias
• Difficulty forming mental representations of space

Question 6

Unilateral Neglect: (Hemi-Inattent)

Answer 6

Sensory, motor, representational, personal, spatial

Question 7

Traumatic Brain Injury

Answer 7

Inability to focus light/image onto the retina: Results in a blurry image

• Inability of retina to process the image: Results in an incomplete or distorted image
• Inability of the optic nerve to transmit visual information: Results in incomplete visual input to the CNS
• Inability of the occipital lobe to process the basic visual details of the image: Results in altered perception

Question 8

Intervening Structures of Traumatic Brain Injury

Answer 8

Conditions resulting from head injury

Transparency of intervening structures is crucial

Question 9

Conditions resulting from head injury:

Answer 9

• Cornea scarring
• Cataract
• Vitreous hemorrhage

Question 10

Transparency of intervening structures is crucial

Answer 10

Any opacity in cornea, aqueous, lens vitreous will prevent the image from reaching the retina

Question 11

Cranial nerve involvement

Answer 11

-CN 1: optic nerve
Sensory
-CN III, IV, VI: oculomotor nerve, trochlear nerve and the abducen nerve.
responsible for movement of the eyes.

Question 12

Functional Deficits of TBI

Answer 12

• Occupations
• Client Factors
• Performance Skills
• Performance Patterns