Term
| Visual acuity vs visual field test |
|
Definition
acuity (with corrective lens): cover one eye, read Snellen Chart
field (without correction): patient looks at your nose, hold fingers in their periphery |
|
|
Term
| A pituitary tumor causes what kind of visual field defect? |
|
Definition
| bitemporal (lacking vision in the lateral sides of R & L visual fields) |
|
|
Term
| How do you check the pupils? |
|
Definition
efferent: shine light in one eye, then the other; look for equal pupil constriction
afferent: shine light in one eye then immediately in the other, pupil size should stay the same
accomodation: patient focuses, then looks away and back. Eyes should turn in, and pupil should get smaller as they focus from far to near |
|
|
Term
| What is responsible for most of the refractive power of the eye? |
|
Definition
|
|
Term
| What other levels of vision are there, if the patient cannot read the largest letters on the eye chart? |
|
Definition
(best to worst)
count fingers vision
hand motion vision
light perception vision
no light perception vision |
|
|
Term
| Visual acuity tests what part of the eye? |
|
Definition
|
|
Term
| What nerve innervates the obicularis oris, and what is the function of this muscle? |
|
Definition
|
|
Term
| What nerve innvervates the levator palpebri, and what is the function of this muscle? |
|
Definition
CN III
levator palpebri opens the eyelid |
|
|
Term
| What is the function of the superior tarsal (Muellers muscle), and what nerve innervates it? |
|
Definition
| helps elevate the lid, sympathetic innervation |
|
|
Term
|
Definition
| Pupils Equal & Round Reactive to Light and Accommodation |
|
|
Term
| What is the most common cause of unilateral or bilateral proptosis? |
|
Definition
|
|
Term
| Explain the pupillary light reaction. |
|
Definition
afferent: light travels along the optic nerve, 50% crosses at the chiasm, impulse enters L & R Edinger-westphal nucleus
efferent: L & R CNIII to ciliary ganglion>pupil constricts |
|
|
Term
|
Definition
afferent pupillary defect
afferent lesion |
|
|
Term
| What is the innervation of the extraocular muscles? |
|
Definition
Sup Oblique: CN IV
Lateral Rectus: CN VI
all the rest: CN III |
|
|
