Difference between revisions of Diopters
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* ''diff-norm gap'': differentials diopter minus normalized diopters, ignoring axis | * ''diff-norm gap'': differentials diopter minus normalized diopters, ignoring axis | ||
** For example, if normalized is -2 SPH -0.5 CYL, and differentials are -0.75 SPH, the diff-norm gap is 1.25 SPH 0.5 CYL or 1.5 SPH equivalent. | ** For example, if normalized is -2 SPH -0.5 CYL, and differentials are -0.75 SPH, the diff-norm gap is 1.25 SPH 0.5 CYL or 1.5 SPH equivalent. | ||
** This quantity is generally positive, as more plus sphere is needed for [[close-up]] than [[distance vision]]. | |||
** The axis is ignored. | ** The axis is ignored. | ||