Practical test revision : SLE Flashcards
Purpose of optical section of cornea
assess and judge the depth of a foreign body / lesion in cornea
set up of optical section (s)
width : narrowest
height : maximal
angle : 30-45 ( larger angle wider section)
magnification: med - high (16-40 )
purpose of optical section of the lens
assess the location of lens opacity and hence determine the type of cataract present
*form optical section of cornea then move SL forward to see lens
purpose of parallelopiped
provide an overview of ocular structure such as eye lid , palpebral conjunctiva and allow some 3D overview of cornea and crystalline lens
set up of parallelopiped
width : 2-3
height : max
angle : 30-45
magnification: low to med (6-10x
Set up of retro illumination from fundus
width : 1-2
height : height of pupil
angle : 0
magnification : low (6x)
purpose of conical beam
look for signs of inflammation cause by uveitis of flare or cell in anterior chamber
set up of conical beam
width : 1
height : 1
angle : ~45
magnification : med to high (16-40)
dark room illumination
purpose of specular reflection
examine endothelium for polymegathism and pleomorphism and precorneal tear film
set up of specular reflection
width : 2-3
height : variable
angle : 45-60
magnification: 40x
- one eye piece only
- angle of i = angle of r if not cannot be seen
purpose of sclerotic scatter
view subtle corneal changes such as oedema, scar , striae and foreign body
set up of sclerotic scatter
width: 1-2
height : max
angle : ~45 decoupled
magnification: 6-10 (low)
purpose of van herick
access the anterior chamber depth and screen patient with risk factor for angle closure glaucoma
set up of van herick
width : narrowest
height: maximal
angle : 60
magnification : 10-16 (med)
less than 25 for van herick
must be referred to opthalmologist to ascertain risk for glaucoma
warn px of ssx of AACG and visit A&E immediately whenever such symptom occur
