Lecture 10 Flashcards
maximum plus power possible with accommodation is called the :
amplitude of accommodation
presbyopia is defined as insufficient amplitude of accommodation due to _____
aging.
Real objects are always the source of ____ rays.
minus
If you have a plus object vergence it means its _____ infinity
beyond
the range of clear vision is defined as the distance between the far point and the near point of vision; stated in units of _____
distance
____ point of vision is aka punctum remotum and is the most distant point the eye can see clearly
far
____ point of vision is aka punctum proximum and represpresnt the closes point the eye can see clearly
near
when finding the range of clear vision using BLOAD, for the FP, set accommodation to ____, for the NP, set accomodation to the amplitude
zero
when finding the range, find the ___ point first
far
if minus, means it is a ____ object, if it was + it means its ____ infinity. If 0 it means its at infinity
real; beyond
when trying to find the range of clear vision and the amplitude of accommodation is equal to size of discrapancy of lens (ametropia) then the near point would be at _____ and the focal point would be beyond infinity
infinity!
The six questions on blur
- where is it blurry
- does the blur go away when you wear your glasses?
- does the blur go away with the pinhole test?
- how fast did the blur come on
- is the blur unilateral or bilateral
- is the blur accompanied by pain, and if so, how painful is it.
If the VA is reduced at both distance and near with and without any glasses, what test can you do to determine if it is a refractive problem?
Pinhole VA measurement;
when do you do a pinhole VA?
when you cannot obtain at least 20/30
If there is no improvement in the vision with the pinhole test, think of a ____ etiology for the VA
non refractive
