Vision Problems 2- Oculomotor Flashcards Preview

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Flashcards in Vision Problems 2- Oculomotor Deck (33):
1

What is strabismus

misalignment of the visual axies

2

Paralytic (non-comitant) strabismus

characterized by the presence of variable angles of deviation in different fields of gaze.

- Adults
- Diplopia (double vision)
- No amblyopia (lazy eye)

3

What is generally the cause of paralytic strabismus?

weakness of one of the extra-ocular muscles.

4

Non-paralytic strabismus or comitant strabismus

-Children
- Angle of deviation remains constant in different fields of gaze

- No diplopia- brain suppresses one of the images

- Amblyopia

- no identifiable muscle weakness

5

Tropia

Visible deviation always

6

Phoria

visual deviation only when fusion is disrupted (covering one eye)

7

Esotropia

crossed eyes

8

Exotropia

outward eyes

9

Hypertropia

upward eyes

10

Hypotropia

downward eyes

11

duction refers to

movement of one eye

12

version refers to

movement of both eyes

13

vergence

movement of both eyes in the same direction...like convergence where both move towards the nose

14

Intorsion

Rotation of the 12 o'clock position of the cornea toward the nose

15

What muscles control intorsion?

superior rectus and superior oblique

16

Extorsion

rotation of the 12 o'clock position away from the nose....inferior rectus and inferior oblique

17

superiors

intorsion

18

Inferiors

extorsion

19

Recti

aduction

20

Oblique

abduction

21

slide 28

just know how the different muscles are affecting eye movement at different gazes etc..

22

Nystagmus

rhythmic, involuntary, to and from motion of the eyes. Motion may be horizontal, vertical, rotary, or combinations of directions

23

Jerk nystagmus

generally seen in neurological disorders

24

Pendular nystagmus

equal amplitude to and fro, usually seen in poor vision

25

Binbocular diplopia

when the seeing of two images is relieved by closing eother eye. Generally the result of paresis of an EOM

26

Monocular diplopia

goes away when the pt closes the affected eye but does not go away if they close the unaffected eye

27

Monocular diplopia usually the result of

irregularities in the optical system of the eye

28

CN III symptoms

- weakness of MR, SR, IR, IO
- Ptosis (weakened levator)
- Non-reactive pupil
- eye down and out
THIS IS SERIOUS

29

common cause of CN III palsy

Aneurysm at the junction of the post communicating and posterior cerebral

30

Paralysis of CN III with normal pupilary responses

Usually a microvascular cause. Patients are generally elderly, have diabetes or hypertension.
May have mild pain at onset.
Recovery within 3-4 months spontaneous

31

CN VI palsy

causes loss of abduction by the eye, the medial rectus then pulls the eye in causing esotropia

32

Esotropia increases as the patient looks?

towards the side of the lesion...think about it. It makes sense

33

CN IV palsy

Look at it