Anatomy of the Eye continued

Question 1

What are the two parts of the first tunic?

Answer 1

Sclera and cornea

Question 2

What is the thickest layer of the cornea?

Answer 2

Stroma

Question 3

What is the limbus?

Answer 3

The junction between the meeting of the cornea and the sclera

Question 4

What is the axial length of the human eye?

Answer 4

26.5 mm

Question 5

What muscle controls the movement of the eyebrows?

Answer 5

Frontalis muscle

Question 6

Name two functions of the eyelids

Answer 6

Protecting the eye and supplying oxygen to the cornea, as well as keeping the eye moist ( ͡° ͜ʖ ͡°)

Question 7

What is another name for the eyelids?

Answer 7

Palpebrae

Question 8

What is the primary function of the iris?

Answer 8

Regulating the amount of light that enters the pupil

Question 9

Which muscle relaxes and allows the lid to droop when a person is tired?

Answer 9

Muller’s Muscle

Question 10

Name the five layers of the cornea, from outermost to innermost in order:

Answer 10

Epithelium, Bowman’s layer, stroma, Descemets membrane, Endothelium

Question 11

What is the average power of the cornea?

Answer 11

43 diopters

Question 12

Which do humans have more of, rods or cones?

Answer 12

Rods - there are 120 million rods and 6 million cones in each retina

Question 13

Why are rhodopsin and iodopsin important?

Answer 13

Rhodopsin in rods provides night vision; iodopsin in cones produces color vision

Question 14

Retinal photoreceptors are sensitive to wavelengths between _____ nanometers

Answer 14

380 nm to 750 nm

Question 15

Which area of the retina is responsible for finely detailed vision?

Answer 15

The fovea, located in the macula

Question 16

Where is the optic disc located?

Answer 16

In the inner tunic of the eye, where the optic nerve leaves the eye

Question 17

Which layer of the tear film contains the nutrients and antibiotic properties that feed and protect the eye?

Answer 17

The Aqueous layer, or the middle layer

Question 18

What is the term for the eyelids turning inward?

Answer 18

Entropion

Question 19

What is the term for drooping eyelids?

Answer 19

Ptosis

Question 20

How many muscles control the movement of the eyeball?

Answer 20

Six :D

Question 21

Name the four straight muscles that control the movement of the eye

Answer 21

Superior rectus, inferior rectus, Lateral/External Rectus, Medial/Internal Rectus

Question 22

Name the two slanted muscles that control the movement of the eye

Answer 22

Superior Oblique, Inferior Oblique

Question 23

Where does visual fusion occur?

Answer 23

In the brain (yeah, this is big brain time)

Question 24

What is the condition whereby a muscle imbalance leads to loss of vision due to lack of fusion?

Answer 24

Amblyopia (lazy eye)