NRA/PRA

Question 1

what is the purpose of NRA and PRA?

Answer 1

to test the patient’s flexibility between accommodation and vergence

Question 2

purpose of NRA

Answer 2

determine how easily the patient can relax their accommodation while increasing convergence
(also a verification of BVA refraction)

Question 3

add __ lenses for NRA

Answer 3

+

Question 4

expected findings for PRA (non-presbyope) are:

Answer 4

-2.37 D +/- 1.00

Question 5

results lower than expected for PRA could be from:

Answer 5

• large eso deviation

- low negative fusional vergence

Question 6

results lower than expected for NRA could be from:

Answer 6

• large exo-deviation

- low positive fusional vergence

Question 7

if the NRA is greater than 3.00 D, what occurred?

Answer 7

the patient was over-minuet during BVA refraction

Question 8

which one evaluates negative accommodation and positive fusional vergence

Answer 8

NRA

Question 9

which one evaluates positive accommodation and negative fusional vergence

Answer 9

PRA

Question 10

NRA uses ___ vergence and base___

Answer 10

positive + , base out (BO)

Question 11

PRA uses ___vergence and base ___

Answer 11

negative -, base in (BI)