lens and cataract NBEO.txt
Home > Preview
The flashcards below were created by user
on FreezingBlue Flashcards.
What happens to the lens during accommodation?
- Lens thickness increases anterior to posterior
- Lens thins along the equator
- Anterior lens surface moves forward
- AC becomes shallower
What UVR does the lens absorb?
UVB and some UVA
What detoxifies free radicals in the lens?
What happens to the lens in diabetes?
Excess glucose = excess sorbitol = hyper osmolaric conditions in lens = water swells in fibers = transparency lost
Histologically, what forms the fetal nucleus?
Anterior lens epithelium
What is important about the fetal nucleus?
What is important about the embryonic nucleus?
- Highest index of refraction (1.5)
- Most mature
What happens to crystallins as we age?
What is important to know about cortical cataracts?
- Usually caused by UVR
- Causes hyperopic shifts
What is important to know about NSC?
- Most common cataract of aging
- Myopic shift
- Loss of glutathione
What causes lamellar cataracts?
What causes Snowflake cataracts?
What causes Christmas tree cataracts?
What causes sunflower cataracts?
Trauma involving copper
What causes oil droplet cataracts?
What causes stellate cataracts?
What happens to the lens with amiodarone?
What happens to the lens with miotics?
What happens to the lens with gold salts?
What would you like to do?
Home > Flashcards > Print Preview