The Eye Flashcards
What’s the function of the lens?
Focus the light onto the retina
What’s the function of the ciliary muscle?
Cause change in the shape of the lens, allowing light to be focused at varying distances
What’s the function of the pupil?
Control the amount of light entering the eye by contracting and dilating
What’s the function of the retina?
To contain the light receptors
What’s the function of the suspensory ligaments?
Adjust the thickness and curvature of the lens, connects the ciliary muscle to the lens
What’s the function of the cornea?
Change size to make sure the correct amount of light enters the eye
What’s the function of the iris?
Control how much light enters the pupil
What’s the function of the optic nerve?
Carry impulses from the eye to the brain
What is long-sightedness caused by?
The eyeball being too short, or the eye lens being unable to focus
What is short-sightedness caused by?
The eyeball being too long, or the eye lens being unable to focus
What type of lens corrects long-sightedness?
Convex / Converging
What type of lens corrects short-sightedness?
Concave / Diverging
What is the range of vision of the human eye?
25cm to infinity
What does the range of vision of the eye mean?
The eye can focus on objects between a near point and a far point
What’s the units of the power of a lens?
Dioptres, D
