Parts of an Eye Flashcards
What are cones?
The color receptors of the eye. There are 7 million cones in the human eye.
What is the cornea?
The transparent part of the eye covering the iris and pupil. It refracts light, providing about ⅔ of the eye’s optical power.
What is the function of the iris?
The iris controls the size and diameter of the pupils, adjusting the amount of light that enters the retina.
What does the lens do?
The lens helps refract light and focus it onto the retina. It changes shape to adjust its focal distance for focusing on objects at different distances.
What is the macula?
The place where light is focused by the structure in the front of the eye. It takes the picture that is sent to the brain, enabling reading and seeing.
What is the role of the optic nerve?
The optic nerve sends information from the retina to the brain.
What is the optic disc?
The raised disk on the retina at the point of entry of the optic nerve, lacking visual receptors and creating a blind spot.
What is the retina?
Lines the inner surface of the eye and creates images based on light passing through. These images are sent to the brain via the optic nerve.
What are rods?
The photoreceptors of the eye that sense brightness, favored during nighttime when color is mostly absent. There are 120 million rods in the human eye.
What is the sclera?
The white outer layer of the eyeball, continuous with the cornea at the front of the eye.
