Eye Defects
What is the built up of pressure in the eye caused by failure to drain away excess fluid called?
Glaucoma
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 yellow spot (fovea) found?
The Retina
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 part of the eye does 20% of the focusing?
Wearing glasses all the time weakens your eyes
False
What are the causes of short sightedness?
The eyeball being too long and the lens is too strong (too fat).
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 most likely damaged in a colour-blind person?
Eye color cant be changed after you're a baby
False
How is Cataract treated?
Replacing eye lens with artificial ones
What is the difference between the Blind Spot and the Yellow Spot?
The Blind Spot lacks retina and there is no vision at this point while the yellow spot provides vision at the center cones.
The cornea does______ percent of the focusing of images?
80%
What is the most important vitamin to keep the eyes healthy?
Vitamin A
You can lose a contact lens behind your eyeball
False
What are the effects of Presbyopia?
-Difficulty focusing on close up images
-Can cause headaches, eye strain and visual fatigue
Name 5 structures of the eye?
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.
A boy looks up from a book at a distant aeroplane. What happens to the ciliary muscles and the lens in his eyes?
The vitreous humour refracts light and helps the eyeball keeps its shape
True