Difference between revisions of Guide:Reducing lens complexity

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There are three rules for reducing complexity:
There are three rules for reducing complexity:
# <div>Alternate types of reductions. Simple -> Equalizing -> Simple -> Equalizing...</div>
# <div>Alternate types of reductions. Simple -> Equalizing -> Simple -> Equalizing...</div>
# <div>Change only spherical or only cylindrical and never both simultaneously</div>
# <div>Change only spherical or only cylindrical and never both simultaneously</div>
# <div>When equalizing, change both differential lenses and normalized lenses simultaneously to keep the [[focal planes]] in sync.</div>
# <div>When equalizing, change both differential lenses and normalized lenses simultaneously to keep the [[focal planes]] in sync.</div>



Revision as of 16:16, 15 June 2020

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:

  1. Alternate types of reductions. Simple -> Equalizing -> Simple -> Equalizing...
  2. Change only spherical or only cylindrical and never both simultaneously
  3. When equalizing, change both differential lenses and normalized lenses simultaneously to keep the focal planes in sync.

TODO: some concrete examples

References

See also

Guide:Resolving double vision