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* https://endmyopia.org/focal-calculator/calc.html | * https://endmyopia.org/focal-calculator/calc.html | ||
* [[Varakari's Vision Log Tool]] | * [[Varakari's Vision Log Tool]] | ||
* [https://play.google.com/store/apps/details?id=org.endmyopia.calc Diopter Calculator Android App] | |||
https://wiki.endmyopia.org/wiki/Measurement | https://wiki.endmyopia.org/wiki/Measurement | ||