What part of the eye changes diameter to regulate the amount of light entering the lens?
A) ciliary body
B) iris
C) pupil
D) lens
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Question 2) Which part of the eye is highly vascularized and contains melanin that absorbs light to prevent reflection?
A) retina
B) choroid
C) iris
D) sclera
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Question 3) The fibrous tunic consists of all of the following EXCEPT the ________.
A) iris
B) sclera
C) cornea
D) corneal limbus
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Question 4) All of the following are muscles that control movements of the eyeball EXCEPT the ________.
A) orbicularis oculi
B) superior rectus
C) medial rectus
D) inferior oblique
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Question 5) What structure drains tears into the nasal cavity?
A) nasolacrimal duct
B) lacrimal ducts
C) lacrimal canals
D) lacrimal puncta
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Question 6) Which muscles close the eyelids?
A) orbicularis oris
B) levator palpebrae superioris
C) superior rectus
D) lateral rectus
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Question 7) What structure distributes tears across the surface of the eye?
A) palpebrae
B) eyelashes
C) ciliary glands
D) lacrimal caruncle
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Question 8) What muscle raises the upper eyelid?
A) lacrimal
B) orbicularis oculi
C) levator palpebrae superioris
D) superior rectus muscle
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Question 9) Which structure CANNOT be seen by looking at someone's eye with an ophthalmoscope?
A) optic chiasm
B) macula lutea
C) fovea
D) optic disc
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Question 10) What is the blind spot in the eye?
A) where more cones than rods are found
B) where the optic nerve leaves the eye
C) where the macula lutea is found
D) where only rods occur
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