The eye Flashcards
(16 cards)
What is the primary function of the eye?
To detect the stimulus of light
The eye is a highly specialised sense organ containing receptor cells.
What are the two types of receptor cells found in the retina?
- Rods
- Cones
What is the role of rods in the eye?
To detect light intensity
Rods are receptor cells sensitive to light.
What is the role of cones in the eye?
To detect colour
Cones are receptor cells that can detect colour.
What is the cornea?
Transparent lens that refracts light as it enters the eye
What does the iris do?
Controls how much light enters the pupil
What is the function of the lens in the eye?
Changes shape to focus light onto the retina
What is the optic nerve?
Sensory neuron that carries impulses between the eye and the brain
What is the pupil?
Hole that allows light to enter the eye
What is the conjunctiva?
Clear membrane that covers the white of the eye and the inside of the eyelids
What is the function of the conjunctiva?
Lubricates the eye and provides protection from external irritants
What is the ciliary muscle?
Ring of muscle that contracts and relaxes to change the shape of the lens
What do the suspensory ligaments connect?
Connect the ciliary muscle to the lens
What is the sclera?
Strong outer wall of the eyeball that helps to keep the eye in shape
What is the fovea?
Region of the retina with the highest density of cones
What is the blind spot?
Point at which the optic nerve leaves the eye, where there are no receptor cells
