Explain prescription

The prescription is the description of the refraction needed to give you an optimal vision. It is described in diopters (D), with a minus – first for those who are myopic/shortsighted, a plus + for those who are hyperopic/farsighted. Addition (add) for the difference between far distance vision and reading vision is always starting with a plus +, typically from +1,00D to +2,50D, while for computer glasses the add is typically +1,75D.

Astigmatism/cylinder (cyl) is typically described starting with a minus -, followed by the direction of the cyl, described as axis (axe).

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