OCT revision Flashcards
what does the OCT of the vitreous normally look like?
black but may look cloudy or vitreous may be visible
what is asteroid hylosis
accumulation of calcium/ lipid globules suspended in the vitreous
- can be picked up with the ophthalmoscope
- can appear as highly reflective bodies on OCT
what do you look for in the OCT of central retina?
areas of hyper or hypo reflectivity
intra or sub retinal fluid
Specific layers that may be involved
The thickness and distribution of individual layers
what is seen on OCT with drusen/ AMD
RPE and Bruch’s membrane doesn’t look smooth and regular
What is seen on OCT of wet AMD
Neovascular membrane and serous detachment of surrounding retina
what is and how does Cystoid macular oedema look on OCT?
Leakage of capillaries and accumulation of fluids into the inter cellular spaces
- Can occur as complication of cataract surgery, diabetes, posterior uveitis
- seen as multiple circular cystic spaces in the retina on OCT
what is central serous retinopathy?
fluid or serious detachment of the retina
due to leakage of fluid from the choroid through small breaks in RPE
what is epiretinal membrane
thin sheet of scar tissue that develops on the surface of the retina
can cause visual distortion
puckering of central retina
what is a macular hole with traction
a shrinkage of the vitreous which leads to a macular hole
a macular hole with traction can lead to a full thickness macular hole
what are hard exudates and how are they seen on OCT?
leakage of lipids from retinal capillaries, usually a complication of diabetes and hypertension
seen as highly reflective areas on OCT
what is retinoschisis
splitting of layer within the sensory retina on outer plexiform layer
quite visible on OCT
