6 - Ocular

Question 1

Why US the EYE?

Answer 1

Easy way for ED to check out:

• eye complaints
• elevated ICP

Question 2

Why is the eye well suited to US/

Answer 2

Its already fluid filled

Question 3

Indications for eye US?

Answer 3

Eye trauma
Acute change in vision
elevated ICP
- HA
- Head trauma
- Alterd LOC

Question 4

Eye probe position?

Answer 4

Transverse view:
- probe marker to pts R

Sagital view:
- marker to pts head

Question 5

How will the anatomy look on eye US?

Answer 5

Anterior chamber and vitrious are black

Lens is white

Optic nerve

• posterior to the globe
• hypoechoic

Pic on slide 7,8,9

Question 6

How to measure for increased ICP?

Answer 6

Measure the optic nerve sheath

- Measurement should take place 3mm behind the globe

Question 7

What does retinal detachment look like?

Answer 7

Acute
Floating membrane is notably thicker than a typical posterior vitreous detachment, also does not include the area anterior to the optic disk

Pic on 12 - 15

Question 8

Dynamic eye scan?

Answer 8

Have the look back and forth and you should see the optic nerve shift back and forth

Question 9

How does a vitreous detachment look on US?

Answer 9

a fine lacy membrane stretches across the posterior globe
- floats to and fro w eye movement

The optic disc and vitreous membrane is not tethered

Pics on 16-18

Question 10

Types of lens dislocation?

Answer 10

Partial:
- subluxation of lens is noted

Complete:
- lenser is floating around, it just wanted to do hoodrat stuff with his friends

Pics on 19, 20

Question 11

Foreign body on eye?

Answer 11

Looks like some stuff that shouldnt be there

Pic on 21

Question 12

Ocular US summary?

Answer 12

Linear transducer w a pillow of gel
Image in 2orthoganoal planes
- transverse view - probe to R
- sagittal view - probe to head
Measure ONSD at 3mm from retina
- normal is <5mm
- >5mm suggest increased ICP (>20mmHg)

Question 13

Why do you never give crabs to charity?

Answer 13

Because they are shellfish