Difference between revisions of Guide:Reducing lens complexity
(Left Eye/Right Eye differentials were swapped (I think)) |
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Normalized | Normalized | ||
Left Eye: -3.50 | Left Eye: -3.50 > -3.25 > '''-3.25''' > -3.00 | ||
Right Eye: -4.00 | Right Eye: -4.00 > -3.75 > '''-3.50''' > -3.25 | ||
Differentials | Differentials | ||
Left Eye: -2.25 | Left Eye: -2.25 > -2.00 > '''-2.00''' > -1.75 | ||
Right Eye: - | Right Eye: -2.75 > -2.50 > '''-2.25''' > -2.00 | ||
==References== | ==References== | ||
Revision as of 22:25, 15 June 2020
 | This article is under construction. Please help develop it, whatever your level of expertise |
TODO: this article needs to be expanded for edge cases like already low diopters.
When to reduce lens complexity
Lens complexity is best reduced before getting into the low diopters range. Ideally, both eyes would be equal before -1.5 diopters. (TODO: cite an EM source for this)
How to reduce lens complexity
Make your first reduction a simple spherical reduction. This will teach you the basics of the EndMyopia methods.
There are two types of reductions:
- A simple reduction is a 0.25 diopter drop in lense power for both eyes, simultaneously
- An equalizing reduction is a 0.25 diopter drop in lense power for one eye, the eye with greater correction (more negative)
An equalizing reduction is done to bring the eyes closer to having the same level of correction.
Either type of reduction can be applied to spherical power or cylindrical power.
There are three rules for reducing complexity:
- Alternate types of reductions. Simple -> Equalizing -> Simple -> Equalizing...
- Change only spherical or only cylindrical and never both simultaneously
- When equalizing, change both differential lenses and normalized lenses simultaneously to keep the focal planes in sync.
Example
Normalized
Left Eye: -3.50 > -3.25 > -3.25 > -3.00 Right Eye: -4.00 > -3.75 > -3.50 > -3.25
Differentials
Left Eye: -2.25 > -2.00 > -2.00 > -1.75 Right Eye: -2.75 > -2.50 > -2.25 > -2.00