JIS T 7319:1988 English Edition

Refractometers

Abstract

This Japanese Industrial Standard specifies the refractometer with which the spherical refracting power, cylindrical rdfracting power and astigmatic axial direction of a lens for correction required to gain the same condition as the refracting power of an eye, namely the normal vision, are to be known, measuring the refreacting conditions of an eye-ball optical objectively.

Details

Note
We will send the latest version to you, please contact us if you want the exact document as the title. Some old Standards are in scancopy and no reaffirmed stamp