Inner Tunic

Question 1

Inner Tunic

Answer 1

In the retina

Question 2

Retina

Answer 2

• Outgrowth of the optic nerve
• What the eyeball is designed around
• Composed of outer pigmented layer and inner nerve layer

Question 3

How does the retina work?

Answer 3

When light enters the eye, it focuses on the nerve layer
and strikes light sensitive nerves called photoreceptors. Once the photoreceptor nerves are activated by the incoming light, the image then travels up the optic nerve to the brain and result in sight.

Question 4

Photoreceptors

Answer 4

2 classifications: Rods and cones

Question 5

Rods

Answer 5

• In the peripheral areas of the retina and detect objects under low light situations (scotopic vision).
• Only give a sensation of shades of grey
• Gives better peripheral vision than central vision

Question 6

Cones

Answer 6

• In the central portion of the retina and work in bright light conditions (photopic vision)
• Responsible for color vision as well as
  clear, crisp central vision.