What is the ANSI standard for axis tolerance with the following prescription: -0.75 -1.00 x 090

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Multiple Choice

What is the ANSI standard for axis tolerance with the following prescription: -0.75 -1.00 x 090

Explanation:
Axis tolerance is the allowable angular deviation of the cylinder’s orientation in a lens. For ANSI standards, the tolerance depends on the cylinder power. With a cylinder of 1.00 diopter, the axis should be within about ±3 degrees of the prescribed axis. So the axis 090 can be manufactured anywhere from 087 to 093 degrees and still be within tolerance. The sphere value doesn’t change this tolerance; it’s the cylinder power that sets the allowable axis deviation.

Axis tolerance is the allowable angular deviation of the cylinder’s orientation in a lens. For ANSI standards, the tolerance depends on the cylinder power. With a cylinder of 1.00 diopter, the axis should be within about ±3 degrees of the prescribed axis. So the axis 090 can be manufactured anywhere from 087 to 093 degrees and still be within tolerance. The sphere value doesn’t change this tolerance; it’s the cylinder power that sets the allowable axis deviation.

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