Fundamentals 1 Flashcards
What is the most common site of scleral rupture in trauma?
Superonasal quadrant near the limbus
Approximately how many collector channels are there?
25-30
What is the actual light sensitive molecule that is regenerated with the visual cycle?
11-cis-retinal; This is the only light sensitive molecule which initiates the visual pathway
What type of ocular finding will you find in congenital rubella that occured in the 1st trimester? 2nd trimester?
Congenital cataract; salt and pepper fundus
Why are topical NSAIDs sometimes given pre-op in cataract surgery?
They prevent pupillary miosis (via prostaglandin release at the time of surgery)
At what point of steroid use does elevated IOP’s tend not be be reversible (that is, permenent IOP elevation)?
18 months
How many long posterior cilliary arteries branch off of the ophthalmic artery?
Usually 2
Which of the 3 ciliary muscles causes the TM to open with contraction?
longitudinal; the is the action of pilocarpine IOP lowering affect
Where is the majority of rhodopsin located?
Plasma mebranes of outer segments
What wave length of light is rhodopsin most sensitive to?
510, which is green light
The surgical limbus is composed of 2 1 mm zones. What are they?
- The anterior blue limbus (starts at termination of bowmans layer)
- The posterior white limbus (overrides the TM)
What glands are thought to be part of reflex tearing?
Now it is thought to be all the lacrimal glands (main + accessory) Same goes for basal tears
What glands of the eye and adnexa are holocrine? Eccrine?
Meibomian, zeis, and goblet cells; gland of Moll; as an aside, the lacrimal gland is exocrine
What are the 3 types of cones and which is not located on chromosome X?
L,M,S; S is not located on chromosome X
What is a major function of the photoreceptor inner segments?
Energy production, this is where mitochondria are found, not in the outer segments
