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What do you call "extremely" ? I am -6 and did not notice any of what you describe, so I assume I'm not nearly as bad a case as you are ?

-9 plus heavy astigmatism. My maximum clear vision distance without glasses is about six inches!

This may be of value to you if you have not done it already, but I came in from -8ish to -6ish just by doing these exercises.

-11 in both eyes here. Seeing the same thing!