Blue 4 Flashcards
What is the Frisby test
3 clear plastic plates of different thicknesses
Four squares with on hidden circle
What range does TNO test cover
480-60 seconds of arc
What is the effective power of the lens?
18-20D
When can rigid contact lenses cause a halo effect?
Pupil is dilated
Due to rereaction of the peripheral lens or adjacent tear film
In standard loupe where is object
Between first principal foxus and lens
What level of magnification of indirect ophthalmoscopy with 13D lens? 20D lense?
13D - 5x
20D - 3x
When does US pachymetry provide a reading
When probe is perpendicular to posterior corneal surface
EOM developement weeks
Week 5 - SR LPS, LR
Week 6 - SO, MR
Week 7 - IO, IR
Order of drainage through lacrimal system
Pucta
Superior and inferior lacrimal canaliculi
Common canaliculus
Nasolacrimal sac
Nasolacirmal duct
Plica lacrimalis
How many layers of conreal epithelium
4-6
How frequent is corneal epithelial turn over
7-10 days
What is Wieger’s ligament
Attachment of vitreous to the lens
What is cloquet’s canal
Perivascular sheath for the fetal hyaloid artery
What absorbs light energy and ascorbate?
Carotenoids - lutein and zeaxanthing
Which respiratory groups are responsible for inspiration and expiration
Dorsal - inspiration BACK IN
Ventral - expiration - Front push out
What % of aq outflow via uveoscleral
40%
Where do basal linear deposits occur
Between RPE basement membrane and RPE cell cytoplasm
What are RF for primary closed angle glaucoma?
Advancing age
Female
FHx
Hypermetropia
Shallow AC
Short axial length
AP thickening of lens
What is Cogan’s microcystic dystrophy
Degeneraiton of cells with cyst formation causing unstable corneal epithelium
What are flexner Wintersteiner rosettes?
Horner Wright rosettes
Fleurettes
Crcle of cells limited internally by continuous membrane
HW - multilayered circle of nuclei surroudning eosinophilic fibrillate material with no limen or ILM
Fleurettes - primitive photoreceptor bodies fleur de lys shape
What do exoenzymes do?
INhibit ROS production
Which immune cells possess many mitochondria
Basophils
How mcuh does intracellular calcium consititue?
1% total body claclium
99% in bones/teeth
Which eicosanoid causes vasodilation?
PgE2 and PgI2
Leucotrienes and thromboxanes cause vasoconstriction
