post-natal development of the visual system - Merrick Flashcards
(30 cards)
what is the rate of maturation of an infants acuity as they get older?
1 cycle/deg per month until they get to 10 cycles/deg
do you get higher values for acuity when measuring with a visually evoked potential? or lower?
much higher
what sized spatial frequencies do we have higher acuity for?
medium sized
LOOK AT CS GRAPH ON SLIDE 16
where does the visual pathway start?
tear film
where does the visual pathway end?
extra-striate cortex
what is the critical limiting factor of visual development?
foveal developmetn
wht does the fovea look like at birth?
ill-defined pit with the inner retinal cell layers present
what does the fovea look like as an adult?
obvious point, with inner retinal cell layers moved aside
which kind of acuity is almost always present at birth ?
CFF (critical flicker fusion)
which kind of acuity has the lowest threshold?
vernier acuity
do we have colour perception at birth?
no
can you measure VA and CS at birth?
yes
can you measure OKN eye movements at birth?
yes
what is the most likely acuity at 1 month? (cycles/deg)
1 cycle/deg
at 2 months, which colour are we unable to see?
yellow
do we have stereovision at 3 months?
no
when do we get stereovision?
6 months
at what age do the eyes grow and change shape?
6 years old
at what age does the fovea differentiate?
5 years
when does myelination occur?
2 years
when does the growth and refinement of synaptic connections in the visual cortex occur?
8 years
when do the ocular muscles grow and differentiate?
6 months
what is the power of the cornea and lens at birth?
55.34D
what is the power of the cornea and lens at 1 year?
44.28 D
