When refractive error is unknown, uncorrected myopia tends to produce higher accommodative amplitudes while hyperopia tends to produce lower amplitudes.

When refractive error is unknown, uncorrected myopia tends to produce higher accommodative amplitudes while hyperopia tends to produce lower amplitudes.

• A. There is no relation between refractive error and amplitude.
• B. Uncorrected myopia will have lower amps and hyperopia higher amps.
• C. Only myopia affects amps; hyperopia does not.
• D. Uncorrected myopia will have higher amps and hyperopia will have lower amps.

Answer: (D)

Accommodative amplitude is the range of focusing power from the far point to the near point. When refractive error is unknown and the eyes are uncorrected, the amount of accommodation already being used for distance vision influences how much is left for near tasks. Hyperopes must accommodate to see distant objects, so part of their accommodative range is consumed just to maintain clear distance vision. That leaves less reserve for near work, producing a smaller measured amplitude. Myopes, on the other hand, can often see distant objects with less or no extra accommodation, so more of their accommodative reserve remains available for near focus, yielding a larger measured amplitude. Hence, uncorrected myopia tends to show higher amplitudes while hyperopia tends to show lower amplitudes.

Accommodative amplitude is the range of focusing power from the far point to the near point. When refractive error is unknown and the eyes are uncorrected, the amount of accommodation already being used for distance vision influences how much is left for near tasks. Hyperopes must accommodate to see distant objects, so part of their accommodative range is consumed just to maintain clear distance vision. That leaves less reserve for near work, producing a smaller measured amplitude. Myopes, on the other hand, can often see distant objects with less or no extra accommodation, so more of their accommodative reserve remains available for near focus, yielding a larger measured amplitude. Hence, uncorrected myopia tends to show higher amplitudes while hyperopia tends to show lower amplitudes.