Flashcards in Retinal Disorders Deck (25)
What type of equipment is used to examine the eye?
Optical coherence tomography
Where are rods located?
Peripheral areas of the retina
What is a specific feature of the blind spot?
No rods or cones
What is electrophysiology?
Investigations recording electrical signals from the eye, optic nerve and brain in response to visual stimuli
What does an electroretinogram measure?
Records action potentials within retina
What does an electrooculogram measure?
Function of RPE and photoreceptors
What do visually evoked potentials measure?
Optic nerve function
Electrical activity in visual cortex
What could be the causes of sudden painless loss of vision?
Central retinal vein occlusion
Central retinal artery occlusion
Ischaemic optic neuropathy
What are the causes of central retinal vein occlusion?
What are the causes of central retinal artery occlusion?
What are the different types of ischaemic optic neuropathy?
How do you differentiate between the different types of ischaemic optic neuropathy?
Arteritic form will have raised inflammatory markers on blood analysis
What are the symptoms of giant cell arteritis?
Loss of vision
What is the investigation for giant cell arteritis?
Temporal artery biopsy
What are the symptoms of optic neuritis?
Pain on eye movement
Reduced vision red desaturation
What is optic neuritis associated with?
What are the causes of gradual painless vision loss?
Age related macular degeneration
Open angle glaucoma
What are the risk factors for age related macular degeneration?
What are the signs of age related macular degeneration?
Distortion of vision
Struggle to read and recognise faces
What are the 2 types of age related macular degeneration?
What are the clinical signs of diabetic retinopathy?
Cotton wool spots
Appearance of new vessels
What are retinal dystrophies?
Inherited conditions affecting photoreceptor function leading to progressive loss of vision
What are some examples of retinal dystrophies?
North Carolina macular dystrophy
Stargardt macular dystrophy
Drug induced retinopathy
What type of drugs will cause retinopathy?