structure of the eye. Flashcards
what does the cornea do?
The cornea is the clear, curved outer layer at the front of your eye.
it protects the eye and acts as a shield against dust, germs, and injury.
it bends (refracts) light, helps focus incoming light onto the retina for clear vision.
Provides most of the eyeβs focusing power β Works with the lens to ensure sharp images.
what does the pupil do?
The pupil is the black circular opening in the center of your eye that controls how much light enters.
Expands (dilates) in dim light β Lets in more light to help you see better.
Shrinks (contracts) in bright light β Reduces light to protect the eye and improve focus.
what does the iris do?
helps control the size of the pupil to let more or less light into the eye
- regulates the amount of light entering the eye
- helps to focus light and images on the retina
what does the lens do?
transmits light, focusing it on the retina. while the lens fine-tunes the focusing of light onto the retina.
what does the retina do?
responsible for the visual processing that turns light energy into three-dimensional images
- absorbs light rays and turns them into electrical signals
what do photoreceptors do?
(rods + cones)
key to turning light that enters the eye into a form of electrical signals that our brain can use for a sense of vision.
optic disc/blind spot
no photoreceptors, so they donβt receive any light
what is the path of light?
cornea - pupil - iris - lens - retina - optic nerve - primary visual cortex (base of the occipital lobes of the cerebral cortex)
what is the acronym to remember the path of light?
C - P - I - L - R
(sounds like caterpillar)
what happens when light is focused on the retina?
the image is upside down, the retina converts the image into electrical signals which travel along the optic nerve to the brain.
what is the visual sensory system?
subject to a range of influences that can determine what we see and attend to, and how we come to understand this information.
