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Should I wear normalized or differentials indoors?

It's not massively important what you wear indoors, as it won't change your vision improvement that much. There is no disadvantage to wearing normalized indoors, because differentials are intentionally blurry and are only used for a fixed focal distance, usually a screen.

You should wear differentials when looking at screens, especially for prolonged periods of time.

When should I change between differentials and normalized?

Whenever you're looking at a screen for a period of time (anything more than a quick glance), it's good practice to switch to your differentials. For all other usage cases, use normalized. The exception is night-driving, in which case you should do the smart thing and wear full correction.

How do I test for eye strain?

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