Question 1

Which of the following structures is responsible for the secretion of aqueous humor in the eye?

Accepted Answer

Ciliary body

Question 2

What is the primary function of the canal of Schlemm?

Accepted Answer

Absorption of aqueous humor from the anterior chamber

Question 3

Which layer of the eyeball is responsible for maintaining its shape and geometry?

Accepted Answer

Sclera

Question 4

The cornea is unique among connective tissues because it is:

Accepted Answer

Transparent and avascular

Question 5

Which of the following best describes the composition of the vitreous body?

Accepted Answer

98-99% water with hyaluronic acid and collagen matrix

Question 6

What is the main function of the choroid in the eye?

Accepted Answer

Nutrition of the retina via its dense capillary network

Question 7

Which muscle is responsible for miosis (constriction of the pupil)?

Accepted Answer

Sphincter pupillae muscle

Question 8

During accommodation for near vision, which of the following changes occur in the lens?

Accepted Answer

Lens becomes more rounded

Question 9

Which of the following is NOT a function of tears?

Accepted Answer

Secretion of aqueous humor

Question 10

A patient presents with increased intraocular pressure. Which structure is most likely malfunctioning?

Accepted Answer

Canal of Schlemm

Question 11

Which equation best describes the total refractive power of the eye, given the cornea provides $$40-43\ \mathrm{dpt}$$ and the lens provides $$15-30\ \mathrm{dpt}$$?

Accepted Answer

$$P_{total} = P_{cornea} + P_{lens}$$

Question 12

Which of the following statements about the lens is correct?

Accepted Answer

It is transparent and avascular

Question 13

The flow of aqueous humor follows which correct sequence?

Accepted Answer

Posterior chamber → pupil → anterior chamber → canal of Schlemm

Question 14

Which of the following is a function of the ciliary body?

Accepted Answer

Fixation and accommodation of the lens

Question 15

Which cell type in the iris determines the color of the eye?

Accepted Answer

Melanocytes

Question 16

A patient with a lesion affecting the parasympathetic innervation of the eye would most likely have difficulty with which function?

Accepted Answer

Constriction of the pupil (miosis)

Question 17

Which of the following best explains why the cornea is transparent?

Accepted Answer

Its collagen fibers are highly organized and it is avascular

Question 18

Which structure is responsible for the microbicidal effects of tears?

Accepted Answer

Lysozyme and IgA in the lacrimal gland secretion

Question 19

Which of the following is true regarding accommodation in the eye?

Accepted Answer

Accommodation is the process by which the eye changes its refractive power to maintain a clear image as object distance varies

Question 20

Which of the following best describes the histological structure of the lens?

Accepted Answer

Simple cuboidal epithelium only at the anterior surface and elongated lens fibers

Anatomy and Histology of the Human Eye

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