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.