Reduced amplitude of accommodation (PRA) is considered reduced when which value is met?

Reduced amplitude of accommodation (PRA) is considered reduced when which value is met?

• A. Less than 1.25
• B. Greater than 1.25
• C. Equal to 1.25
• D. Not measured

Answer: (A)

The key idea is how much minus demand the eye can tolerate while still keeping near targets clear. PRA measures the amount of minus power the eye can add, and a reduced PRA means the eye can’t accommodate as much as expected under that demand. In clinical practice, a PRA value below about 1.25 diopters is considered reduced because normal individuals typically tolerate roughly 2 to 3 diopters of minus before blur occurs. So a measurement less than 1.25 D indicates diminished accommodative reserve, which can contribute to difficulty sustaining near work or fatigue. Values at or above 1.25 D are closer to normal, and “not measured” isn’t informative about the eye’s accommodative capacity.

The key idea is how much minus demand the eye can tolerate while still keeping near targets clear. PRA measures the amount of minus power the eye can add, and a reduced PRA means the eye can’t accommodate as much as expected under that demand. In clinical practice, a PRA value below about 1.25 diopters is considered reduced because normal individuals typically tolerate roughly 2 to 3 diopters of minus before blur occurs. So a measurement less than 1.25 D indicates diminished accommodative reserve, which can contribute to difficulty sustaining near work or fatigue. Values at or above 1.25 D are closer to normal, and “not measured” isn’t informative about the eye’s accommodative capacity.