Structure Of The Eye

Question 1

What are the layers for the structures of the eye?

Answer 1

1.fibrous layer-outer layer
2.vascular layer-middle layer
3.sensory layer-inner layer

Question 2

What are humors?

Answer 2

-fluids that fill the interior of the eyeball

Question 3

What is the sclara and what layer is it found in?

Answer 3

-anteriorly seen as the “white part of the eye”
-made up of whitish connective tissue
-found in fibrous layer

Question 4

What is the cornea and what layer is it found in?

Answer 4

-transparent;central anterior portion
-allows fro light to pass through
-repairs easily
-only human issue that can be transplanted w/o fear of rejection
-found in fibrous layer

Question 5

What is the vascular layer?

Answer 5

-choroid is a blood rich-nutriative layer in the posterior of the eye
-pigment prevents light from scattering
-split into 2 parts anteriorly

Question 6

What are the 2 anterior parts of the vascular layer and describe them

Answer 6

-Ciliary body-smooth muscles that attach to the lens by ciliary zonule (suspensory ligament)
-Iris-relguates amount of light being let in
-with iris, pigment gives eye color and the pupil is the rounded opening to the iris

Question 7

What is the sensory layer made up of?

Answer 7

-retina contains 2 layers
-outer pigmented layer and the inner neural layer

Question 8

What is the outer pigmented layer and where is it found?

Answer 8

-the outer pigmented layer is found in the sensory layer and absorbs light and prevents scattering

Question 9

What is the inner neural layer and where is it found?

Answer 9

-the inner neural layer is found in the sensory layer which contains photoreceptors like rods and cones
-neurons of the retina and vision

Question 10

Describe rods

Answer 10

-found near the edges of the retina
-allow vision to dim light and peripheral vision
-allow perception in grey tones

Question 11

Describe cones

Answer 11

-allows for color vision
-found in center of retina
-fovea centralis-found lateral to blind sport
-fovea is the area of the retina with only cones and has the sharpest vision

Question 12

Where can you not find photoreceptors?

Answer 12

At the optic disc or at blind spot

Question 13

What is color blindness?

Answer 13

-a genetic disorder where an individual lacks cones and are unable to see different colors

Question 14

Describe the lens

Answer 14

-crystal+biconvex structure
-held together by suspensory ligament and ciliary body

Question 15

What are cataracts?

Answer 15

-when lens becomes hard and opaque
-results in blurry vision or blindness

Question 16

What are risk factors for cataracts?

Answer 16

-diabetes
-smoking
-frequent exposure to light