Eye Physiology

When light hits the retina, the _________ are stimulated.

• sclera

• optic disk

• photoreceptors

• choroid coat

Sensory neurons in the retina send ____________ which are routed to the visual cortex in the occipital lobe of the brain.

• action potentials

• blind spots

• light waves

• accomodations

In order to see clearly, light rays must be bent to hit the ______ of the retina.

• blind spot

• optic disk

• fovea centralis

• focal point

Light waves are bent first by the ______.

• cornea

• aqueous humor

• lens

• vitreous humor

The lens is naturally ______, clear and elastic.

• oval

• flat

• round

• concave

When the eyeball is too long causing Nearsightedness

• Myopia
• Hyperopia
• Asigmatism
• Presbyopia

When the eyeball is too short, causing Farsightedness

• Hyperopia
• Myopia
• Glaucoma
• Astigmatism

It’s a change to the lens that causes it to stiffen and also discolor the lens of the eye. It causes blurring of up close vision that impedes ability to read printed material or text on a screen. This is often related to aging.

• Myopia

• Presbyopia

• Hyperopia

• Astigmatism

It lets light enter the eye

• iris

• retina

• pupil

What part of the eye has the highest concentration of rods and cones?

• optic nerve
• fovea centralis
• optic disk
• iris