Corrective Methods
How Do You Correct Short Sight (Myopia)?
Wear Concave Lens
What Causes Short sight (Myopia)?
Lens too strong/fat, eyeball too long.
What is the function of the Iris?
To control the amount of light passing through the pupil.
What becomes more convex to focus the light on the retina?
The Lens.
Where contains blood vessels to supply nutrients and oxygen?
The Choroid.
How do you correct Long sight (Hyperopia)
Wear Convex Lens
What causes Glaucoma?
A build up of pressure in the eye caused by failure to drain excess fluids.
What is the function of the Retina?
To convert light energy to nerve impulses.
What has a tough fibrous layer that keeps the spherical shape?
The Sclera.
Where provides detailed vision at the center but only at the cones?
The yellow spot (fovea).
How to correct Glaucoma?
Surgery
What causes Cataract?
Opaque Lens (Is clouded stopping light from entering)
What is the function of the pupil?
To allow light to pass through a hole.
What structure transmits nerve impulses to the brain?
The Optic Nerve.
If the image is turned upside down on the retina where does the image turn right side up?
The Brain.
How to correct Astigmatism?
Cylindrical Lens
What causes Long sight (Hyperopia)?
Lens too weak/thin, eyeball too short.
What is the function for the suspensory ligament?
To support the Lens.
Where lacks the retina, and no vision at this point?
The Blind Spot.
What is accommodation?
The way the lens adjust to view near and far objects.
How do you correct Presbyopia?
Multi focal Contact Lens
What causes Presbyopia?
The hardening of the lens and the lens become less flexible.
What is the function for the Aqueous Humour?
To refract light, and help maintain shape.
What contracts and relaxes to change the shape of the lens?
The Cilliary muscle.
What happens in the ciliary muscle, suspensory ligament, and lens when you are viewing distant objects
The ciliary muscle relaxes; the suspensory ligament is pulled tight, and the lens is pulled thin.