Difference between revisions of Guide:Reducing lens complexity
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TODO: this article needs to be expanded for edge cases like already low diopters. | |||
TODO: this article needs to be expanded for edge cases like already low diopters. | |||
==When to reduce lens complexity== | ==When to reduce lens complexity== | ||
[[Lens complexity]] is best reduced before getting into the [[low diopters]] range. Ideally, both eyes | [[Lens complexity]] is best reduced before getting into the [[low diopters]] range. Ideally, normalized correction for both eyes should be simple and equal by the time a low diopters range (e.g. -1.5 [[diopters]])<ref>https://endmyopia.org/pro-topic-nick-is-time-to-equalize-diopters/</ref> is reached. | ||
==How to reduce lens complexity== | ==How to reduce lens complexity== | ||
'''Make your first reduction | '''Make your first reduction or two simple and [[spherical]]. This will teach you the basics of the [[EndMyopia]] methods.''' | ||
There are two types of reductions: | There are two types of reductions: | ||
* <div>A simple reduction is | * <div>A ''simple reduction'' or ''binocular reduction'' is drop in lens powers for both eyes, simultaneously</div> | ||
* <div>An equalizing reduction is | * <div>An ''equalizing reduction'' or ''monocular reduction'' is drop in lens power for one eye, the eye with greater correction (more negative)</div> | ||
An equalizing reduction is done to bring the eyes closer to having the same level of correction. | An [[equalizing]] reduction is done to bring the eyes closer to having the same level of correction. Jake said that "...if you do reduce the ratio, you should have at least 2 regular spherical reductions in between."<ref>https://community.endmyopia.org/t/key-to-patching-successfully-reducing-diopter-ratio/333/6</ref> This is not always possible, especially when [[Guide:High diopter gap|high anisometropia]] is involved. | ||
There are three types of reductions with respect to the power change: | |||
* a 0.25 [[diopter|D]] drop to [[spherical]] power | |||
* a 0.25 D drop to [[cylindrical]] power | |||
* a trade of 0.5 D cylindrical power for 0.25 D spherical power | |||
There are | '''There are four rules for reducing complexity:''' | ||
# <div>Alternate types of reductions. Simple | # <div>Alternate types of reductions. Have one (Simple > Equalizing > Simple > Equalizing...) or two (Simple > Simple > Equalizing > Simple > Simple > Equalizing...) simple drops between equalizing drops.</div> | ||
# <div>Change only spherical or only cylindrical and never both simultaneously.</div> | |||
# <div>For an equalizing reduction, change both differential lenses and normalized lenses simultaneously to keep the [[focal planes]] in sync.<ref>https://endmyopia.org/the-diopter-ratio-trap-dont-favor-one-eye/</ref></div> | |||
# <div>For a simple reduction, change differential lenses a few weeks after normalized lenses to keep changes to [[focal planes]] to a minimum.</div> | |||
'''A note on rule 3 and rule 4:''' Keeping focal planes in sync is a higher priority than keeping changes to focal planes to a minimum, thus rule 3 exists. | |||
{| class="wikitable" style="text-align:center;" | |||
|+ Example Spherical Reduction Schedule | |||
|- | |||
! style="text-align:left;" | Reduction Type | |||
! colspan="2" | Normalized | |||
! colspan="2" | Differentials | |||
! style="text-align:left;" | Explanation | |||
|- | |||
| style="text-align:left;" | | |||
| Left | |||
| Right | |||
| Left | |||
| Right | |||
| style="text-align:left;" | | |||
|- | |||
| rowspan="2" style="text-align:left;" | | |||
| -3.50 | |||
| -4.00 | |||
| -2.25 | |||
| -2.75 | |||
| style="text-align:left;" | This is the '''starting point'''. | |||
|- style="text-align:left;" | |||
| colspan="4" style="text-align:center;" | wait 8 - 16 weeks | |||
| | |||
|- | |||
| rowspan="4" | Simple | |||
| -3.25 | |||
| -3.75 | |||
| | |||
| | |||
| style="text-align:left;" | Perform normalized reduction. | |||
|- style="text-align:left;" | |||
| colspan="4" style="text-align:center;" | wait 4 - 8 weeks | |||
| (rule 4) | |||
|- | |||
| | |||
| | |||
| -2.00 | |||
| -2.50 | |||
| style="text-align:left;" | Perform differential reduction. | |||
|- style="text-align:left;" | |||
| colspan="4" style="text-align:center;" | wait 4 - 8 weeks | |||
| | |||
|- style="font-weight:bold;" | |||
| rowspan="2" | Equalizing | |||
| -3.25 | |||
| -3.50 | |||
| -2.00 | |||
| -2.25 | |||
| style="text-align:left;" | Both norms and diffs are reduced simultaneously. (rule 3) | |||
|- style="text-align:left;" | |||
| colspan="4" style="text-align:center; font-weight:bold;" | wait 8 - 16 weeks | |||
| | |||
|- | |||
| rowspan="4" | Simple | |||
| -3.00 | |||
| -3.25 | |||
| | |||
| | |||
| style="text-align:left;" | Perform normalized reduction. | |||
|- style="text-align:left;" | |||
| colspan="4" style="text-align:center;" | wait 4 - 8 weeks | |||
| (rule 4) | |||
|- | |||
| | |||
| | |||
| -1.75 | |||
| -2.00 | |||
| style="text-align:left;" | Perform differential reduction. | |||
|- style="text-align:left;" | |||
| colspan="4" style="text-align:center;" | wait 4 - 8 weeks | |||
| | |||
|- style="font-weight:bold;" | |||
| rowspan="2" | Equalizing | |||
| -3.00 | |||
| -3.00 | |||
| -1.75 | |||
| -1.75 | |||
| style="text-align:left;" | Both norms and diffs are reduced simultaneously. (rule 3) | |||
|- style="text-align:left;" | |||
| colspan="4" style="text-align:center; font-weight:bold;" | wait 8 - 16 weeks | |||
| | |||
|} | |||
==References== | ==References== | ||
| Line 33: | Line 120: | ||
==See also== | ==See also== | ||
* [[Equalizing]] | |||
* [[Guide:Resolving double vision | Resolving double vision]] | |||
[[ | * [[reduction | Reduction]] | ||
[[Category:Guides]] | [[Category:Guides]] | ||