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Normalized lenses (jargon) (normal use or distance) are for distance vision as the primary stimulus to improve eyesight.

Normalized lenses reduce the blur horizon by just enough to give good stimulus from blur and double vision challenge, but definitely not enough to make the world significantly blurry. Good normalized lenses allow the user to continue daily activities without impairment, except night time driving, for which a higher correction is a very good choice. (Always ensure your eyesight meets the minimum legal requirement while driving.) Normalized lenses induce a small amount of myopic defocus, which has been shown to reduce axial length in a clinical study.[1]

How strong should normalized be?

New recommendation

Normalized should be slightly (0.25 or 0.5 D) reduced from a 20/20 correction, unless you are near the end of a reduction or trying to clear blur adaptation, in which case they are equivalent to 20/20 correction.

When you're starting out with EndMyopia, you will likely have a lot of ciliary spasm and eye strain. Lucky you! This means your early rate of improvement will be staggeringly high, before it slows and you enter the long game of much slower improvements.

The golden rule with all of EndMyopia: don't reduce too quickly. It is recommended that you reduce no more than 0.25 diopters from 20/20 correction, or 0.5 D from full correction. This gives plenty of good stimulus and blur challenge for the majority of moderate myopes. If your myopia is higher (7 diopter+) or you need more challenge for stimulus, you may consider doing a 0.5 D reduction (0.75 D from full correction). But in general there are no benefits to reducing more quickly, and most of the time reducing too quickly will lead to problems than faster progress. Take your time!

Old recommendation

According to older EM articles, if you undercorrect more, you use more active focus, get more stimulus, and improve faster. However, with huge undercorrection, some people run into blur adaptation and don't improve at all. It is therefore important to test what works for you.

Specifically, the old 20/50 rule[2] says to reduce until you can get 20/50 with AF in natural light but indoors. This can result in a 2 D undercorrection, which might not work for everyone.


See also: Guide:Reducing normalized

Generally, reduce by 0.25 D. The best way to introduce a normalized reduction is with a "zero diopter reset".


Jake recommends starting with differentials, and using normalized 4–6 weeks later after starting differentials.[3] There may be a fair amount of over correction to remove, your measurements through the 4-6 weeks of differentials use should help you to determine if you need more that the 0.25 reduction (up to 0.50 for high myopia). High myopes will generally get more accurate measurements by using differentials to measure with and accounting for the difference. In general, never reduce more than 1 diopter for your first pair of normalized, from the correction you were using before EndMyopia. In the early stages of vision improvement, your goal will be to find Active Focus, and correcting your distance vision habits so that you can get the stimulus you need to improve your eyesight.

When do I wear normalized

Normalized glasses are your normal glasses. You wear them all the time. Typically for anything that's more than two feet away from you.

"What if I just need to use my phone for like a minute?" CHANGE YOUR GLASSES. If you are asking yourself "should I switch to differential glasses for closeup?" the answer is always YES.

Q: What if someone SEES me?

A: It's just a new pair of glasses, they probably don't care. (How much do you care when you see someone else wearing a new pair of glasses?)

Q: ... but high schoolers care about everything, they will notice!!!

A: Sure, that's fine! Just tell them something short and truthful, and don't make it a big deal (unless you want to). If it's not a big deal to you, it won't be a big deal for them, either.


If you have pseudomyopia, do you need to wear normalized glasses? Probably not! Only wear normalized glasses when you need them to be able to see things.

See also


  1. Read, Scott A.; Collins, Michael J.; Sander, Beata P. (December 2010). "Human Optical Axial Length and Defocus". Investigative Ophthalmology & Visual Science.
  3. The EndMyopia Blog,