Flashcards in Unit VIII - Eye Deck (108)
What is the area of clearest vision?
What are the only photoreceptors found in the macula lutea?
As we head toward the periphery, we see more of which photoreceptor?
More rods, less cones
What kind of photoreceptors do we see on the very edges of our field of vision?
What is the most anterior primary refractory structure?
What is the condition of abnormality in the shape of the cornea?
What is the clear fluid secreted by the ciliary processes found on the posterior aspect of the ciliary body?
Aqueous fluid is secreted into which chamber of the eye?
Posterior chamber (part of the anterior segment located posterior to the iris)
The aqueous humor passes through the pupil into the anterior chamber, travels laterally, and leaves the eyeball through what sinus?
Scleral venous sinus
(Canal of Schlem)
What causes glaucoma?
Increased pressure within the anterior segment of the eyeball (can result in blindness)
What is unique about the vascular supply to the lens?
Is the lens convex or concave?
Does increasing convexity or increasing concavity of the lens allow for nearer vision?
What structure separates the anterior segment from the posterior segment?
Which segment of the eye is filled with aqueous humor?
Which segment of the eye is filled with vitreous humor?
What condition results when the lens gets harder with age and loses its flexibility which can result in more difficult near vision?
What condition results from the lens becoming less transparent?
What are the characteristics of the vitreous humor?
Gelatinous and transparent
What is the vestigial structure connecting the optic nerve and the posterior aspect of the lens?
What artery is contained in the hyaloid canal?
Fetal hyaloid artery
In what population does the hyaloid canal serve no functional purpose?
In which direction do tears flow?
Lateral to medial
Where are the lacrimal glands located?
Superolaterally to the eyeball
What structures carry tears from the lacrimal glands to the surface of the eye?
Where are the lacrimal ducts found?
In each eyelid below and medial to the eyeball
What is the function of the lacrimal ducts?
Drain tears into the lacrimal sac
Where is the lacrimal sac found?
In a groove between the lacrimal bone and the maxilla
What is the most superior part of the nasolacrimal duct?