PEG direct opthalmoscopy Flashcards
1
Q
purpose?
A
- intraocular examination of ocular media + fundus
- can also observe anterior segment (lids + lashes)
- revolutionised eye examinations by allowing observation of the ocular fundus and replacing the diagnosis of amaurosis (an outwardly healthy eye with poor vision) with a multitude of others for which an aetiology and treatment could be sought
2
Q
why?
A
- fundus assessment is legally required for a primary eyecare examination
- to screen for internal eye diseases
e.g. cataracts, glaucoma, maculopathy - to screen for systemic diseases
e.g. diabetes, hypertension
3
Q
what is it?
A
- handheld instrument
- easily portable (adv)
- illuminates the retina (where examiner would get in the way of incident light)
4
Q
construction
A
- sight-hole lenses
- diaphragms
- multi-element condensing system
- light bulb
5
Q
components
A
6
Q
features
A
- produces erect (upright) + real (formed when rays converge) images
- no dilation required
lack of light reflections - close working distance
- limited view (2 disc diameters / 5 degrees)
- monocular
7
Q
routine examination
general points
A
- dim room illumination
- use RE w px’s RE + vice versa
- select appropriate aperture stop
close working distance
8
Q
what do we see?
A
- external eye (eyelids, lashes, sclera)
- media
- fundus
