Thanks a lot for your reply. Yup I got this feeling after the presenter dodged that question. However I also got the impression that it is currently unknown wether the axis of the eye shortens after these exercises, is that true? I read more about the topic and some people call the improvement in visual acuity "blur adaptation" - can "blur adaptation" really produce such drastic effects, and if so - are there potential side-effects?

For example in my case I have medium myopia (< -3). The prospect of not wearing glasses anymore is very appealing to me and I don't really care about the length of the eye if all the symptoms disappear with this "blur adaptation. What am I missing?