structure of the eye Flashcards
What is the conjunctiva
Layer of cells on outside of the eye, which protects the cornea which is a transparent layer of cells
What protects the rest of the eye the conjunctiva doesn’t protect
The sclera
How does the eye focus an image
Bending the light coming into the eye to a specific point so it is a lot more focused
Which part of the eye bends most of the light
The cornea bends light by a fixed amount
Which part of the eye bends the rest of the light the cornea doesn’t
The lens
How does how the lens bends light differ
The lens can bend light different amounts depending on the distance of the object
How does the lens bend light in varying amounts
By increasing or decreasing the thickness of the lens
What muscles carry out the thickening or thining of the lens
Ciliary muscles
How does the eye control how much light enters the eye
By adjusting the pupil size
How does the eye adjust the pupil size
Muscles in the iris
Where does light go once it has travelled through the pupil
It travels through a transparent jelly called a vitreous humour
What is the final destination of light entering the eye
The retina
What is the layer behind the retina
An absorbant layer called the choroid
What is the purpose of the choroid
Stops light being reflected behind the retina. Means that the only light being absorbed by the retina is light from outside the eye instead of reflected from behind the retina
What does the retina contain
Photoreceptors
