First slide

The optical instruments

Question

An imaginary line joining the optical centre of the eye lens and the yellow point is called as

Moderate

A

Principal axis
B

Vision axis
C

Neutral axis
D

Optical axis

Solution

Vision axis is the lens meridian that has no cylinder power to correct astigmatism. The axis number helps our eye care provider to know the direction in which they should position a cylindrical power in the lenses of our glass.

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