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NRA/PRA and Myopia Exam Questions And
Answers |Latest 2025 | Guaranteed Pass
PRA is adding what type of lenses and it does what to accommodation and vergence? -
Answer✔adding minus lenses to help increase accommodation, which is fine but that will
change the target you are looking at, but that must be kept constant, so you need to prevent
that.
So you add the minus lenses, and this will increase blur driven accommodation, which will then
increase accommodative convergence, while cause the eyes to turn in, increasing divergence to
make target single, so hence you decrease convergent accommodation and now you're back at
trying to make target single again to increase power of eye again
NRA is adding what type of lenses and it does what to accommodation and vergence? -
Answer✔you add plus lenses and this will help to relax accommodation.
So patient must decrease blur-driven accommodation, which will decrease accommodative
convergence and now target goes double cause patient is looking behind it. So now patient
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must increase disparity mergence to keep target single, but that in turn will increase
convergent accommodation making target blurry again, so patient must go back to beginning
and decrease blur-driven accommodation.
People who have problem with PRA or low values is a cause from what conditions? -
Answer✔Well, they have a problem increasing their accommodation or a problem relaxing their
convergence, because remember once the target goes double you have to relax eyes to make it
single again.
So patients may have a hard time increasing accommodation- Accommodative insufficiency, or
they are presbyopic.
OR they have a hard time binocularly, so they have a CE, or they have an eso deviation
Normal values for NRA/PRA when patient is less than 30 years old! - Answer✔+2.00 and
between -2.50 to -2.75
How far is the target for NRA/PRA and should they be wearing correction? - Answer✔40 cm
and with habitual Rx
2|Page
NRA/PRA and Myopia Exam Questions And
Answers |Latest 2025 | Guaranteed Pass
PRA is adding what type of lenses and it does what to accommodation and vergence? -
Answer✔adding minus lenses to help increase accommodation, which is fine but that will
change the target you are looking at, but that must be kept constant, so you need to prevent
that.
So you add the minus lenses, and this will increase blur driven accommodation, which will then
increase accommodative convergence, while cause the eyes to turn in, increasing divergence to
make target single, so hence you decrease convergent accommodation and now you're back at
trying to make target single again to increase power of eye again
NRA is adding what type of lenses and it does what to accommodation and vergence? -
Answer✔you add plus lenses and this will help to relax accommodation.
So patient must decrease blur-driven accommodation, which will decrease accommodative
convergence and now target goes double cause patient is looking behind it. So now patient
1|Page
, ©THEBRIGHT 2025 ALL RIGHTS RESERVED 12:53 PM A+
must increase disparity mergence to keep target single, but that in turn will increase
convergent accommodation making target blurry again, so patient must go back to beginning
and decrease blur-driven accommodation.
People who have problem with PRA or low values is a cause from what conditions? -
Answer✔Well, they have a problem increasing their accommodation or a problem relaxing their
convergence, because remember once the target goes double you have to relax eyes to make it
single again.
So patients may have a hard time increasing accommodation- Accommodative insufficiency, or
they are presbyopic.
OR they have a hard time binocularly, so they have a CE, or they have an eso deviation
Normal values for NRA/PRA when patient is less than 30 years old! - Answer✔+2.00 and
between -2.50 to -2.75
How far is the target for NRA/PRA and should they be wearing correction? - Answer✔40 cm
and with habitual Rx
2|Page
