When your eyes haven't improved after 3-6 months, you have hit a plateau.[1]
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You do want to give your visual cortex plenty of time to catch up to lower correction. I endlessly repeat the “wait at least 4-6 weeks between focal plane changes” guru-mantry for plenty of good reason. You want to catch (and clear) double vision artifacts, you want to get all you can get out of the reduced diopter stimulus, before moving on to the next reduction. There’s exactly zero benefit to rushing the process!
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Let’s talk about those plateaus. They can happen for a million reasons. Usually it’s students going to fast with diopter reductions. Sometimes someone doesn’t actually learn active focus or get the right habits, but appears to be making gains, just fixing the over “prescription” and reducing some of the close-up ciliary spasm. Sometimes it’s accommodation range, presbyopia related issues. Some students just won’t listen and monkey with too many focal planes.