NATA class of test 1.56.03
ISO 8598, ISO 12311
ORLAB is NATA accredited for calibration of reference ophthalmic and other lenses.
with least uncertainties of measurement of-
0.01 m⁻¹ in refractive power in the range -0.25 to +0.25 m-1
0.015 m⁻¹ in refractive power in the range -25 to +25 m-1
0.01 cm.m⁻¹ in prismatic power to 20 cm.m-1
1° in axis
Based on reference lenses calibrated by the National Measurement Institute, Australia and the National Physical Laboratory, UK.