Retina - The light-sensitive layers of nerve tissue at the back of the eye that receive images and sends them as electric signals through the optic nerve to the brain, Iris - Pigmented muscular part of the eye that has the opening for the pupil and causes the pupil to change in size to adjust the amount of light that comes in., Pupil - The opening in the iris that allows light to pass into the lens. , Cornea - The clear transparent covering of the eye., Sclera - The white part of the eye., Optic Nerve - The cord-like structure that sends the image to the brain., Optic disk - There are no light sensitive rods or cones to respond to a light stimulus at this point in the eye. This causes a break in the visual field called "the blind spot., Tapetum lucidium - Reflective layer that allows some animals to see better in low light conditions., Lens - transmits light and focuses it on the retina., ciliary body - changes the shape of the lens when the eye focuses. It also makes the clear fluid that fills the space between the cornea and the iris., ciliary zonule - connects ciliary body to lens and causes lens to change shape when pulled by the ciliary body., aqueous humor - fluid produced by the eye. It provides nutrition to the eye, as well as maintains the eye in a pressurized state., vitreous humor - The clear jelly-like substance that fills the inside of the eyeball. Prevents the eye from collapsing and provides nutrients to the eye, choroid - filled with blood vessels that bring oxygen and nutrients to the eye., fovea centralis - area of best vision. Used to read, drive, and see pictures or faces. Allows to see shapes, colors, and details clearly and sharply.,

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