L5 Seeing things: the retina part Flashcards
Only ___ of the human eyeball is exposed.
1/6
The eye muscles are the most ____ muscles in the human body.
active
An iris has _____ unique characteristics
256
Eyes are the _____ most _____ organ in body
second; complex
1 eye has ___ blind spot
one
The human eye only see three colours, ________
red, green, blue
Colour blindness is more common in ______
males
There are around ______ million blind people in the world, and ____% of vision problems worldwide are avoidable/ curable
39; 80
The total retina is a __________ of between ____ and ____ mm in diameter
circular disc; 30; 40
Area of the human retina is about _____ square cm
10
Sclera is a _____ & _____ tissue
tough; elastic
What does sclera do?
avoid the eye from expanding from the pressure
What does choroid do?
provide oxygen and nutrition to the retina
What does retina do?
Neuronal tissue that can convert light signal and send to the brain
How does the posterior segment maintain the round shape?
The gel-like fluid w/ intraocular fluid
What only goes out from the optic nerve, but not in?
Axons of output neurons
What goes in and out from the optic nerve head?
Blood vessels
Which part of the eye has the highest acuity vision?
Fovea
Why there is a blind spot?
There is an optic nerve head in our eyeball
Which part also provide us high acuity vision?
Macular
Which part is the thinnest place in retina?
Fovea
What is the thickness of retina?
200 millimetres thick
The ________ shows greatest variations in the center.
Retinal thickness
The retina is thinnest at the _______ and thickest at the _________
foveal floor; foveal rim