Advanced Eye Quiz

Q1. Why can obstruction of aqueous humor outflow raise intraocular pressure?

• Continued aqueous production exceeds impaired drainage
• Vitreous humor is rapidly secreted by the retina
• The lacrimal gland fills the posterior chamber
• The optic nerve pumps fluid into the anterior chamber

Q2. Why is the central retinal artery clinically vulnerable to occlusion?

• It supplies inner retinal tissue with limited effective collateral circulation
• It supplies only the extraocular muscles
• It is the only artery supplying the cornea
• It drains directly into the cavernous sinus

Q3. Which embryologic structure gives rise to the neural retina?

• Surface ectoderm of the lens placode
• First pharyngeal pouch
• Paraxial mesoderm only
• Inner layer of the optic cup

Q4. Which embryologic tissue gives rise to the lens?

• Endoderm
• Optic stalk neuroectoderm
• Surface ectoderm
• Neural crest only

Q5. Why does the optic nerve head lack normal photoreception?

• Photoreceptors are absent where ganglion-cell axons exit
• The iris permanently covers the optic disc
• The lens blocks all light from reaching it
• The choroid is absent from the entire posterior eye

Q6. How does contraction of the ciliary muscle facilitate near vision?

• It directly constricts the cornea
• It increases zonular tension so the lens flattens
• It reduces zonular tension so the lens becomes more convex
• It pulls the retina toward the cornea

Q7. Why is the choroid well suited to support the outer retina?

• Its dense vascular bed lies adjacent to the outer retina
• It forms the transparent anterior surface of the eye
• It produces tears for the cornea
• It contains the axons forming the optic nerve

Q8. Which anatomical relationship explains why retinal detachment can threaten photoreceptor function?

• The lens detaches from the iris
• Separation of neural retina from retinal pigment epithelium disrupts outer retinal support
• The sclera separates from the cornea
• The optic nerve separates from the extraocular muscles

Q9. Why can injury to parasympathetic fibers traveling with CN III produce a dilated pupil?

• Loss of sphincter pupillae activation reduces pupillary constriction
• The optic nerve normally contracts the pupil
• Loss of CN III directly paralyzes the dilator pupillae
• The ciliary body mechanically closes the pupil

Q10. Which statement best integrates the major anatomical organization of the eyeball?

• Three major coats surround refractive media that focus light onto the neural retina
• The eye is a single muscular chamber containing only aqueous humor
• The retina forms the external fibrous coat and controls pupil diameter
• The sclera directly converts light into optic nerve impulses