CSC - Opthalmology practical Flashcards Preview

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Flashcards in CSC - Opthalmology practical Deck (15):
1

What colour are filters usually?

blue and green, sometimes yellow

2

Use - slit lamp

use for contour of surface structures and inner structures an gauge depth of corneal ulcers. Lamp is binocular so better depth of vision.

3

How do you differentiate blood from pigment in eye (especially if chronic and has degenerated a bit)?

change from white to green filtered light – blood will change colour from red to brown, pigment will not change at all.

4

Where is a lesion at a focus of +12?

lens

5

Where is a lesion at a focus of +20

cornea

6

Use - DDO

you can observe both pupils in the same beam of light and you can use this to check for isochoria (i.e. pupils of different sizes).

7

Method - CDO

– turn light beam intensity down so as not to hurt the eye. Scan eye up and down, medially and laterally. Remember it is a magnified view so many scans are necessary.

8

Which surface should face towards you on CDO?

convex surface facing towards you

9

Why use saline for a fluorescein strip rather than tap water?

irritation of chloride on eye with tap water.

10

T/F: fluorescein is excited by blue light

True

11

Time for proxymetacaine to work

20 seconds

12

Normal eye IOP pressure = ?

12-22/24 mmgHg

13

What does increase in IOP suggest?

retina pressures (possibly glaucoma)

14

What does decreased IOP suggest?

inflammation

15

T/F: it is good to apply a viscous tear to the eye after tanometry

True