Topic 5- 2-The Eye Flashcards
Where is the conjunctiva located and what is its function
It is a thin layer at the front of the eye (on top of cornea) it is there to stop microorganisms entering the eye
Where is the cornea located and what is its function
It is a clear layer underneath the conjunctiva (in front of the aqueous humour) it help bend the light slightly into the eye
Where is the aqueous humour located and what is its function
It is a jelly like substance located at the front of the eye (beneath the cornea) it is there to maintain the shape of the eye
Where is the pupil located and what is its function
It is located in the middle of the iris, it is a hole to allow light to enter the eye
Where is the iris located and what is its function
It is located around the pupil, it controls how much light enters the eye
Where is the lens located and what is its function
It is located behind the pupil, it is there to refract the light and focus it onto the retina
Where is the suspensory ligaments located and what is its function
It is attached to the lens, it is there to hold the lens in place
Where is the ciliary muscle located and what is its function
It is attached to the suspensory ligaments, it changes the shape of the lens to help focus the light onto the retina
Where is the vitreous humour located and what is its function
It is located at the back of the eye (behind lens, ahead of the retina), it helps maintain the shape of the eye
Where is the retina located and what is its function
It is located ahead of the choroid layer, but behind the vitreous humour. It is a layer of light sensitive cells which allows us to see images
Where is the choroid layer located and what is its function
It is located behind the retina, it holds the retina in place and has lots of blood vessels
Where is the fovea located and what is its function
It is located in the retina, it is an area which has the most light sensitive cells. It is where images are seen at their best quality
Where is the schlera located and what is its function
It is the tough outer layer which protects the eye
Where is the optic nerve located and what is its function
It is located in the retina, this is carries the image from the eye to the brain so that it can be flipped so it faces the right way up.
What happens in dim light, to the eye, and the radial & circular muscles
It dilates (the pupil expands) to allow as much light into the eye as possible. Radial muscles contract, circular muscles relax
