Eye

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Flow of tears

Lacrimal gland > Excretory lacrimal duct > Superior/inferior lacrimal canal > Lacrimal sac > Nasolacrimal duct > Nasal cavity (inferior nasal concha)
Superior oblique muscle innervation

Trochlear N (CN IV)
Lateral rectus muscle innervation

Abducens N (CN VI)
Medial rectus muscle function

Adduction
Lateral rectus muscle function

Abduction
Paralysis of a single eye causes...

double vision
This reflex may be absent in head trauma victims

Direct and consensual light reflex
Direct and consensual light reflex shows what?

Function of CN III and optic pathway.
Progressive degeneration and opacity of the lens that leads to blindness.

Cataract
Retinal ischemia and blindness due to impaired drainage of the aqueous humor from the Schlemm's canal.

Glaucoma
When the optic disk bulges out due to increased intracranial pressure.

Papilledema