Uncorrected Refractive Error
the most common form of treatable visual impairment globally
Presbyopia
most common form of refractive error
rods
lots, high convergence to ganglion cells, one type (grey), very light sensitive and widespread throughout the retina
rods
lots, high convergence to ganglion cells, one type (grey), very light sensitive and widespread throughout the retina
cones
less in retina, low convergence to ganglion cells, three types (blue, green and red)
very little sensitivity and concentrated in the macula and has a narrow sensitivity
what makes up the optic nerve
Axons of Ganglion Cells join the retina to the brain
Optic Nerve
exiting the back of the eye
what makes up the optic nerve
Axons of Ganglion Cells join the retina to the brain
Optic Nerve
exiting the back of the eye
what does the pink neuro-retinal rim represent
the axons with the pale central cup simply an empty space
What photoreceptors are found mainly in the macula?
cone
What photoreceptors help deliver information about colour to the brain?
cone
What photoreceptors work best in dim light conditions?
rod
What cells are most ‘sensitive’ to light?
rod
area most damaged in premature babies?
parietal lobe resulting in lower visual field loss
If the left occipital lobe is damaged what type of visual field loss is most likely to develop?
Right Hemianopia
What lobe of the brain hosts the ‘primary vision cortex’?
occipital lobe
What lobe of the brain serves the function of ‘attention’?
parietal lobe
What lobe of the brain hosts our ‘visual library’?
temporal lobe
What lobe of the executes action based on vision?
frontal lobe
