Difference between revisions of Guide:Reducing differentials
Viceroy Sam (talk | contribs) == See also == Guide:Reducing normalized |
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Go to the [https://endmyopia.org/focal-calculator/calc.html calculator], and enter in 60cm. The result is '''-1.75'''. Subtract this value from both of your eyes (be careful with negative numbers). | Go to the [https://endmyopia.org/focal-calculator/calc.html calculator], and enter in 60cm. The result is '''-1.75'''. Subtract this value from both of your eyes (be careful with negative numbers). | ||
<math>OD (right eye): -4.25-(-1.75)=-2.5</math> | <math>OD\ (right\ eye): -4.25-(-1.75)=-2.5</math> | ||
<math>OS (left eye): -3.25-(-1.75)=-1.5</math> | <math>OS\ (left\ eye): -3.25-(-1.75)=-1.5</math> | ||
So, you should use OD/OS -2.5/-1.5, if 60cm is the main distance you perform up | So, you should use OD/OS -2.5/-1.5, if 60cm is the main distance you perform [[close-up activity]]. Simple! | ||
==References== | ==References== | ||