The Eye Flashcards
(12 cards)
What are the 11 parts to the eye?
Optic nerve, blind spot, retina, cornea, pupil, aqueous humor, iris, lens, vitreous humor, sclera, tapetum.
What does the cornea do?
The tough, clear covering over the iris and the pupil that helps protect the eye. Light bends as it passes through the cornea. This is the first step to making and image in the retina. The cornea begins bending light to make and image; the lens finishes the job.
What does the pupil do?
The pupil is the dark circle in the center of your iris. It’s a hole that lets light into the inner eye. Human pupils are round.
What does the aqueous humor do?
A clear fluid that helps the cornea keep it’s rounded shape.
What does the iris do?
A muscle that controls how much light enters the eye. It is suspended between the cornea and the lens. Human iris’s can come on many colours.
What does the lens do?
A clear, flexible structure that makes an image on the eye’s retina. The lens is flexible so that is can change shape, focusing on close up objects and far away objects.
What does the sclera do?
The thick, tough, white outer covering of the eyeball.
What does the vitreous humor do?
The thick, clear jelly that helps give the eyeball its shape.
What does the tapetum do?
The colourful, shiny material located behind the retina. Found in animals with good night vision, the tapetum reflects light back throught the retina.
What does the optic nerve do?
The bundle of nerve fibres that carry information from the retina to the brain.
What does the blind spot do?
The place where the optic nerve leaves the retina. Each eye has a blind spot where there are no light sensitive cells.
