Zero diopter reset

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When introducing a reduction, it is not advised to just slap them on your face, as the visual cortex associate the change with lowered clarity, which is bad. You want to start with lower correction before introducing the reduction, which makes the visual cortex associate it with increased clarity.


As a rule, you never want to wear your new lower normalized on the same day after wearing your full correction or previous normalized correction.

What you do is take a day you can manage with no correction (or differentials in the case of high myopia) from the beginning of the day for as long as reasonably possible, until you start to feel uncomfortable. This way when you introduce your new normalized the relative standard for expected clarity is that things are much clearer and this is a good change. The good association with your new correction is a big advantage.


If you already wore the previous differentials, do not wear the new differentials until the next day.

Low Myopia

Instead of reducing from -1.5, -1.25, or -1 (based on personal preference), the current EM strategy is to alternate zero and normalized correction, which is called "Low Myopia Zero Diopter Reset Trick".[1]