¤Functional Vision Worksheet¤
Disease/Condition: Strabismus / The inability of both eyes to look directly at an
object at the same time
Different types:
· Esophoria (one or both eyes turn inwards)
· Esotropia (both eyes turn inward, one eye more so than the other)
· Exophoria (one or both eyes turn outward)
· Exotropia (both eyes turns outward, one eye more so than the other)
· Hypertropia (one or both eyes turn upward)
· Hyperopheria (one eye turns upward)
· Hypophoria (one or both eyes turn downward)
· Hypotropia (both eyes turn downward, one is lower)
Etiology (cause): Extraocular muscle imbalance
· Sensory problems (anything that causes a decrease in vision in one eye)
· Mechanical problems (anything that prevents the eyes from having a full range of
motion)
· Innervational problems (anything that prevents the brain from sending the right
signals to the eye muscles)
· Can be hereditary
· May be caused by partial paralysis
Portion(s) of anatomy affected:
· External ocular muscles
Category of Vision Loss:
· Reduced visual acuity
Resulting effect on vision:
1. Poor depth perception
2. Eye-hand coordination
3. Eyestrain, poor concentration
4. Blurring of print
Examples of potential situations where decreased visual function may occur
1. When students have to read for long periods, blurring and eye strain may occur.
Frequent rest periods may be needed.
2. It may be difficult to drive, because tracking fixating, scanning, and following fast
moving objects may cause eye strain.
3. It may be difficult to participate in a physical activity such as tennis because a
student may need more time to adjust to tasks that involve eye-hand
coordination.