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Cards (100)
nervous layer
pigment
layer and
neural
layer
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retina is a layer of...
thin transparent
layer of
nervous
tissue
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retina position - extends from...
extends from
optic disc
to the
ora serrata
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surface area retina
1,094mm2
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thickest retina
near optic
disc
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thinnest retina
foveal
floor and towards
periphery
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one degree of visual angle =
288
μm on the retina
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retina colour
depends
on amount of
pigmentation
of individual
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small amounts of pigment retina
-light
coloured funds
-allows for viewing
sub-retinal
elements
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darkly pigmented retina
-fundus = typically more
heavily
pigmented
-sub-retinal
elements not seen
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retinal blood vessels - 2 types
arterial supply
and
venous drainage
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arterial supply retina
central retinal
artery and
posterior
ciliary
artery
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venous drainage retina
arcade veins
->
central retinal vein
choroidal veins
->
vortex veins
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retinal
zones
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ora serrata - this is the transition zone between..
transition zone between
retina
and
pars
plana
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ora serrata postion
underlying the
vitreous base
and associated with increased risk of
retinal detachment
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ora serrata width
-2.1mm
temporally
-0.7mm
nasally
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optic disc - this is the region at back of eye where...
region at the back of the eye where the
optic
nerve meets the
retina
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optic disc dimensions
-vert diameter =
1.86mm
-hor diameter =
1.75mm
-3.4mm
from macula
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physiological cup - what type of area is it? what is it free from?
-pale
central area
-free from
nerve axons
-cup disc ratio
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area centralis - what type of zone and location
circular zone of retina situated between the
superior
and
inferior
temporal
arteries
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area centralis shape
elliptical
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what is fovea
clinical macula
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macula lutea
oval zone of yellow
discolouration
within centre of
retina
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macula lutea size
3mm
in diameter
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yellow colour macula lutea dye name
xanthophyll
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fovea
centre of area
centralis
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fovea position
-4mm
temporal to disc
-0.8mm
below horizontal meridian
-1.85mm
diameter thickness
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what does fovea correspond to =
5 degree
of visual field
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foveal avascular zone
capillary free zone
in centre of
fovea
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foveal avascular zone size
0.2-0.6mm
diameter
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foveola
-highest
visual acuity
-thinnest
part of retina
-devoid
of ganglion cells
-only
cones
and
muller
cells
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umbo
-tiny
depression
in the centre of
foveola
-corresponds
foveol
reflex
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foveol reflex
-intensely bright spot of
light
-visible due to reflexion of light from
wall
of
foveal
depression
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loss of foveal reflex
early sign of
damage
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neuron III
conductive
elements
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neuron II
conductive
and
associative
elements
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neuron I
perception
elements
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retinal pigment epithelium - single layer of... contains....
-single
layer of
hexagonal
cells
-contain
melanin
&
lipofuscin
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adjacent RPE cells have what type of junctions?
tight
junctions and constitute outer
blood retinal
barrier
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See all 100 cards
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