Difference between revisions of Diopters
Endmpiauser (talk | contribs) added alternative notation for calculating diopter from the newsletter |
Endmpiauser (talk | contribs) |
||
| Line 50: | Line 50: | ||
, for example when talking about reducing a correction while keeping the same '' gap '' . This can also be expressed as a [[ wikipedia: Percent Difference | percentage difference ]] between the two diopter values <ref> {{ quote jake | https://endmyopia.org/reducing - diopter - ratio - diy - patching - solution - pro - topic/ | Diopter Ratio Reduction: DIY Solution (PRO TOPIC) }} </ref> (for example, the <tt> 0.5 dpt </tt> difference between the right eye and the left eye is here equivalent to <tt> 0.5 dpt / | - 1.5 dpt | = 0.33 </tt> or 33%). The general recommendation is that the left - | , for example when talking about reducing a correction while keeping the same '' gap '' . This can also be expressed as a [[ wikipedia: Percent Difference | percentage difference ]] between the two diopter values <ref> {{ quote jake | https://endmyopia.org/reducing - diopter - ratio - diy - patching - solution - pro - topic/ | Diopter Ratio Reduction: DIY Solution (PRO TOPIC) }} </ref> (for example, the <tt> 0.5 dpt </tt> difference between the right eye and the left eye is here equivalent to <tt> 0.5 dpt / | - 1.5 dpt | = 0.33 </tt> or 33%). The general recommendation is that the left - | ||
diopter differenceshould be constant on all lenses used. However, some old EM papers show successful cases where the differentials are equalized but normalized with a deviation of 0.25 D.<ref>https://endmyopia.org/progress- | diopter differenceshould be constant on all lenses used. However, some old EM papers show successful cases where the differentials are equalized but normalized with a deviation of 0.25 D.<ref>[https://endmyopia.org/progress-improving-centimeter-62-90/ Sara: Improving Centimeter from 62 to 90]</ref><ref>[https://endmyopia.org/saras-journey-truth-long-term-vision-improvement-potential/ Sara’s Journey: The Truth About Long Term Vision Improvement Potential]</ref> | ||
Confusingly, diopter deviation is also sometimes used to refer to diff - norm deviation, the difference between [[ differentials ]] and [[ normalized ]] or the [[ spherical equivalent ]] of this difference. <ref> | Confusingly, diopter deviation is also sometimes used to refer to diff - norm deviation, the difference between [[ differentials ]] and [[ normalized ]] or the [[ spherical equivalent ]] of this difference. <ref>[https://endmyopia.org/pro-qa-equalize-differentials-first/ Pro Q&A: Should You Equalize Your Differentials First?]</ref> | ||
It is often useful to disambiguate what is being compared: | It is often useful to disambiguate what is being compared: | ||
| Line 61: | Line 61: | ||
** For example, if the norm is - 2 SPH - 0.5 CYL and the differentials are - 0.75 SPH, the diff - standard deviation is 1.25 SPH 0.5 CYL or 1.5 SPH equivalent. | ** For example, if the norm is - 2 SPH - 0.5 CYL and the differentials are - 0.75 SPH, the diff - standard deviation is 1.25 SPH 0.5 CYL or 1.5 SPH equivalent. | ||
** The axis is ignored. | ** The axis is ignored. | ||
** This quantity is usually positive, because more positive sphere is needed for [[ close-up ]] than for [[ distance vision ]] . | ** This quantity is usually positive, because more positive sphere is needed for [[ close-up ]] than for [[ distance vision ]] . | ||
==Technical Details== | ==Technical Details== | ||