Eyes And Vision

Question 1

What are the structures that make up the outer fibrous layer of the eye?

Answer 1

-sclera and cornea

Question 2

What structure makes up the middle vascular layer of the eye?

Answer 2

-choroid

Question 3

What structure makes up the inner layer of the eye?

Answer 3

-retina

Question 4

The exit area on the retina is called?

Answer 4

-optic disk

Question 5

Why is the optic disk called the blind spot?

Answer 5

-contains no photoreceptors to detect light

Question 6

What is myopia?

Answer 6

• elongated eye
• image falls before retina
• nearsightedness

-corrected with concave lens

Question 7

What is hyperopia?

Answer 7

• eyeball is shortened
• image falls behind retina
• farsightedness

-corrected with convex lens

Question 8

What is emmetropia?

Answer 8

-normal visual acuity

Question 9

What test is used to examine visual acuity?

Answer 9

-Snellen eye chart

Question 10

What is astigmatism?

Answer 10

• irregular shape of cornea or lens

- corrected using uneven or cylindrical lenses

Question 11

What are the muscles of the eye (2)? And what are their functions

Answer 11

• outer radial muscle (dilates eye;sympathetic)

- inner circular muscles (constricts eye;parasympathetic)

Question 12

What is trichromatic color vision?

Answer 12

• provided by the stimulation of three types of cones, designated blue, green, red.
  
  • colors refer to the region of visible spectrum in which each cones pigment absorbs light best