Before revision: Positive relative accommodation (PRA) is a measure of the maximum ability to stimulate accommodation while maintaining clear, single binocular vision.www.vision-therapy.com This measurement is typically obtained by an orthoptist, ophthalmologist or optometrist during an eye examination using a phoropter.
After revision: in biology,eyePositive relative accommodation (PRA) is a measure of the maximum ability to stimulate accommodation while maintaining clear, single binocular vision.www.vision-therapy.com This measurement is typically obtained by an orthoptist, ophthalmologist or optometrist during an eye examination using a phoropter.