How the Eyes Work

Which layer is a blood vessel-rich layer with a dark brown membrane located between the retina and the sclera? 

• Choroid
• Sclera
• Retina
• Cornea

What is the point where there are no photoreceptors and is considered a "blind spot"?

• Optic nerve
• Fovea centralis
• Optic disc
• Lens

What is the innermost layer and most delicate layer of the eyeball where photoreceptors are located?

• Sclera
• Choroid
• Retina
• Cornea

The vitreous humor is a fluid contained in the anterior segment of the eye.

• True
• False

Which part of the eye contracts and dilates based on the environment? 

• Pupil
• Cornea
• Sclera
• lens

What is letter B

• Optic nerve

• Lens

• Cornea

• Retina

• Pupil

What is letter E?

• Vitreous humor
• Retina
• Cornea
• Optic nerve

What is letter G?

• Sclera

• Retina

• Lens

• Vitreous humor

• Pupil

What is letter I?

• Cornea

• Lens

• Vitreous humor

• Optic nerve

• Pupil

Photoreceptors that detect grey tones in low light are called...

• Rods
• Cones