structure of the eye. Flashcards
(26 cards)
what is the function of the cornea?
the cornea bends light to help focus it on the retina.
protects the eye from outside infiltrates.
what does the pupil do?
the adjustable opening in the centre of the iris that allows light to enter the eye.
what does the iris do?
the coloured part of the eye that controls the size of the pupil.
it regulates how much light enters the eye by contracting or dilating the pupil.
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 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.
what is the optic disc?
the point where the optic nerve exits the eye, with no photoreceptors (rods or cones).
this is why we have a blind spot.
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 - O
(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.
what is the location of the cornea?
front, outermost layer of the eye.
what is the function of the aqueous humor?
the clear fluid that fills the space between the cornea and the lens. It helps maintain intraocular (inside the eye) pressure and provides nutrients to the eye.
what is the location of the aqueous humor?
between the cornea and the lens.
what is the location of the pupil?
the black circular part of the eye.
what is the location of the iris?
surrounds the pupil.
what is the function of the lens?
focuses light onto the retina.
the lens changes shape (accommodation) to focus on objects at different distances.
where is the location of the lens?
behind the iris and pupil.
what is the vitreous humor?
the clear, jelly-like substance that fills the space between the lens and the retina.
it helps maintain the shape of the eye and allows light to pass to the retina.
where is the location of the vitreous humour?
behind the lens, filling most of the eye.
what is the function of the retina?
the light-sensitive layer at the back of the eye that contains photoreceptors (rods and cones). it detects light and converts it into electrical signals.
what is the location of the retina?
the innermost layer at the back of the eye.
what is the optic nerve?
transmits visual information from the retina to the brain.
where is the optic nerve?
exits the eye from the back and connects to the brain.
where is the optic disc?
in the retina, where the optic nerve connects.
