eyeball
nourish the outer layer of the retina
choroid
What part of the eye converts light energy into nerve impulses?
The Retina
What does the optic nerve do?
It transmits nerve impulses to the brain.
In which part of the eye is the fovea found? What is the fovea?
found in The Retina. where visual acuity is the highest
Two parents with brown eyes could have a blue-eyed child.
True
What defect causes distorted vision or parallel/vertical bars to appear bend?
Astigmatism
What are sensitive to color and are only affected by high light intensity?
The Cones
Where is light most refracted in the eye?
The Cornea
What is depth perception?
the ability to see things in three dimensions (including length, width and depth), and to judge how far away an object is
Wearing glasses all the time worsens and weakens your eyes
False
What are the causes of being "far sighted" or hyperopia?
eyeball grows too short from front to back, or when there are problems with the shape of cornea or lens
What contracts and relaxes to ulter the shape of the lens?
The Ciliary Muscle
What is the main purpose of the pupil?
It shrinks or grows to allow light into you eye
What is the tapetum lucidum? purpose?
increases ability to see at low light levels. reflects the light back through the eye to the light source
The human eye can differentiate approximately 10 million different colors.
truther.
what is the purpose of the iris?
controls the amount of light that passes through the lens to the retina
What is the Blind Spot
The Blind Spot lacks retina and there is no vision at this point
The cornea does more or less of the focusing of images compared to the lens?
cornea does way more focusing.
80%
What is the most important vitamin to keep the eyes healthy?
Vitamin A
Carrots are an excellent source of vitamin A
Our eyes remain the same size throughout life
trueee
perceive shades of gray
rods
Name 5 structures of the eye and their purpose?
External Eye Muscle, Sclera, Choroid, Cornea, Lens, Retina, Optic Nerve, Pupil, Iris, Suspensory Ligament, Blind Spot
What happens to the muscles in the iris and the pupil size when a person moves from a dark room to bright sunlight?
The Ciliary Muscles contract in the iris and the pupil gets smaller.
what is eye accommodation
Accommodation is the ability of the eye to change the thickness of the lens
The vitreous humour refracts light and helps the eyeball keeps its shape
True