Week 4 Objective 6 Flashcards
1
Q
Accommodation: how many diopters can be corrected for in children?
A
14
2
Q
accommodation in young people
shape of the lens in a relaxed state, versus the mechanism of tension
A
no tension on it, so it’s spherical
ligaments on the lens cause them to remain relative flat under normal conditions
tension is relieved by the contraction meridinol fibers of ciliary muscle
circulary fibers from the ciliary muscle also decrease tension
3
Q
Ciliary muscles
A
meridional and circular fibers, controled by CN III
4
Q
Accommodation in older folks: traits of lens with age etc
A
lens becomes more
thick
wider
less elastic
with age
power of accommodation decreases to less than two diopters by the age of 45 to 50
it decreases to I by 70
presbyopia
