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Could you share these sources please? Interested in seeing how newer models improve upon The Bates Method.

Sure, some fundamentals are here and absolutely no money is needed to understand the principles better: https://gettingstronger.org/2016/03/faq-for-vision-improveme... .

That page neither contains or links to any actual data on the effectiveness of any of the techniques described.

Nor I claimed they do, though, as for my previous, very clear comments about this matter above.