Will a patient with Accommodative Insufficiency have a more reduced NRA or PRA?

Will a patient with Accommodative Insufficiency have a more reduced NRA or PRA?

• A. NRA
• B. PRA
• C. Both
• D. Neither

Answer: (B)

Accommodative insufficiency mainly limits the eye’s ability to generate enough accommodation to focus at near. Relative accommodation tests separate relaxing and stimulating accommodation: NRA measures how well you can relax accommodation by adding plus lenses to a near target, while PRA measures how well you can stimulate accommodation by adding minus lenses. In AI, the constraint is generating more accommodation, so the ability to stimulate accommodation (PRA) is reduced. The capacity to relax accommodation (NRA) is relatively preserved, since there isn’t a primary problem with releasing the focus. So the patient will show a more reduced PRA than NRA.

Accommodative insufficiency mainly limits the eye’s ability to generate enough accommodation to focus at near. Relative accommodation tests separate relaxing and stimulating accommodation: NRA measures how well you can relax accommodation by adding plus lenses to a near target, while PRA measures how well you can stimulate accommodation by adding minus lenses. In AI, the constraint is generating more accommodation, so the ability to stimulate accommodation (PRA) is reduced. The capacity to relax accommodation (NRA) is relatively preserved, since there isn’t a primary problem with releasing the focus. So the patient will show a more reduced PRA than NRA.