Accommodation Amplitude
Calculate the amplitude of accommodation in diopters from near point distance measurements.
Measurement Input
Closest distance at which the patient sees clearly.
Fixed test distance (commonly 33 cm or 40 cm).
Total minus power at which the patient reports first sustained blur.
Result
Enter a measurement and click Calculate.
0.00
D
Amplitude of Accommodation
Method:
—
Formula:
—
Typical AA by Age (Push-Up)
| Age | Avg AA (D) | Near Pt (cm) |
|---|---|---|
| 10 | 14.0 | 7.1 |
| 20 | 11.0 | 9.1 |
| 30 | 8.0 | 12.5 |
| 40 | 5.0 | 20.0 |
| 50 | 2.5 | 40.0 |
| 60 | 1.0 | 100 |
Summary
Calculate the amplitude of accommodation in diopters from near point distance measurements.
How it works
- Select the measurement method: Push-Up (near point distance) or Minus Lens.
- For Push-Up: enter the near point distance in centimeters.
- For Minus Lens: enter the working distance and the total minus lens power used.
- Click Calculate to see the amplitude of accommodation in diopters.
- Compare the result with Hofstetter's age-based norms shown below.
Use cases
- Assess accommodative function in pediatric and adult patients.
- Screen for accommodative insufficiency or excess.
- Document baseline accommodation before prescribing reading lenses.
- Monitor changes in accommodation amplitude over time.
- Support clinical notes with quantified diopter values.
- Cross-check push-up results with the minus lens method.
Frequently Asked Questions
Last updated: 2026-07-01 ·
Reviewed by Nham Vu