Difference between revisions of Diopters
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Confusingly, diopter gap is also sometimes used to refer to the diff-norm gap, the difference between [[differentials]] and [[normalized]] or the [[spherical equivalent]] of that difference.<ref>https://endmyopia.org/pro-topic-managing-your-maximum-diopter-gap/</ref> | Confusingly, diopter gap is also sometimes used to refer to the diff-norm gap, the difference between [[differentials]] and [[normalized]] or the [[spherical equivalent]] of that difference.<ref>https://endmyopia.org/pro-topic-managing-your-maximum-diopter-gap/</ref> | ||
It is often useful to disambiguate what is being compared: | |||
* ''left-right gap'': left eye diopters minus right eye diopters, ignoring axis | |||
* In the example above, the left-right gap is +0.5 SPH -0.5 CYL. | |||
* ''diff-norm gap'': differentials diopter minus normalized diopters, ignoring axis | |||
* As an 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. | |||
==Technical Details== | ==Technical Details== | ||