NRA/PRA Flashcards
1
Q
What is the main reason for NRA/PRA testing?
A
To determine the range of accommodative abilities when convergence demand is kept constant
2
Q
Do you perform NRA or PRA first?
A
NRA
3
Q
Which relaxes accommodation?
A
NRA
4
Q
Which do you use minus lenses for?
A
PRA
5
Q
During NRA test, which system do you use to keep the target single?
A
PFV
6
Q
What system causes the blur point?
A
Either the accommodation system or fusional ability
7
Q
What does an increased NRA mean?
A
Overminused or underplussed
Too much accommodation
8
Q
What does a reduced NRA mean?
A
Accommodative spasm or poor PFV (exo patient)
9
Q
What does an increased PRA mean?
A
Great accommodative system
10
Q
What does a reduced PRA mean?
A
Accommodative insufficiency or poor NFV (eso patient)
