Words: Flashcards
Visual Acuity
- Sharpness
- visual detail
Myopia
- Near sighted
- image focused in front of retina
Hyperopia
- far sightedness
- image focused on back of retina
Astigmatism
-cornea not a perfect shape
Snellen fraction far acuity #-
20 ft
Snellen fraction near acuity #
16 feet
Oculomotor function
Maintain foveation on a object
Fixation
Locate and maintain gaze of an object
Smooth pursuits
Ability to follow a image smoothly
Saccadic function
Ability to direct and coordinate movement quickly
Accommodation
Ability to change focus of eye
Specific cranial nerve lesions-
unable to maintain central position
Medial rectus is CN
III
Superior oblique is CN -
CN IV
Lateral rectus is CN
VI
Cranial nerve VI palsy:
- damage to lateral rectus
- unable to move eyes laterally
- Horizontal diplopia for far vision– think #6 soccer going far
CN IV palsy
- damage to superior oblique
- Unable to move eye up and down
- Vertical dipolia for near vision
Ptosis can be due to
Cranial nerve III palsy
Cranial nerve III palsy
- Unable to move eye up, medial, or down
- ptosis
- Diplopia for near vision
Testing pursuits
- test without glasses
- H, X, O
- test each eye separately then together
Testing saccades:
- with out without glasses
- hold two different targets
- direct client to look at which command
- preformed in three fields- superior, inferior, or middle
Which saccades is slightly weaker:
Superior
Binocular complaints
-double vision
Stereopsis
ability to perceive 3 dimensional depth
Converge-
both eyes turn inward
Divergence
both eyes turn outward
Phoria
Tendency to point up, down, in and out
Tropia
condition that eye faces in out up or down
Eso
Medial deviation
Exo
Lateral deviation
Hyper
up deviation
Hypo
down deviation
Amblopia
Lazy eye
- reduced vision, no correction with glasses
- eye sees with blur
Testing vergence: glasses on or off
On
When testing vergence and eyes turn out unable to see double:
break point
When target is single again when testing vergence:
Recovery
Norms: Breakpoint should be:
Recovery point should be:
2-4 inch
6-8 inch
Testing visual field
Have client look at nose
- client says when they see one or two fingers
- preformed in horizontal, vertical or diagonal plane
Left temporal and right nasal may be:
left homonomoyus heminopsia
