What effect does PRA have on accommodation?

Get ready for the NBEO Binocular Vision Test. Study with comprehensive materials and multiple-choice questions. Enhance your exam readiness with detailed explanations and practice questions to improve understanding and performance.

Multiple Choice

What effect does PRA have on accommodation?

Explanation:
PRA shows how much you can stimulate accommodation beyond your resting level by adding minus lenses while keeping the target distance fixed. As minus power is introduced, the eye must increase its accommodation to keep the image clear; the test continues until you reach blur or lose single vision. So the effect on accommodation is an increased accommodative response—the more minus you can add, the more you can recruit accommodation. (Relaxing accommodation would come from plus lenses in NRA, not PRA. If there were no effect, you wouldn’t be able to increase accommodation at all.)

PRA shows how much you can stimulate accommodation beyond your resting level by adding minus lenses while keeping the target distance fixed. As minus power is introduced, the eye must increase its accommodation to keep the image clear; the test continues until you reach blur or lose single vision. So the effect on accommodation is an increased accommodative response—the more minus you can add, the more you can recruit accommodation. (Relaxing accommodation would come from plus lenses in NRA, not PRA. If there were no effect, you wouldn’t be able to increase accommodation at all.)

More Multiple Choice Questions
Subscribe

Get the latest from Passetra

You can unsubscribe at any time. Read our privacy policy