It makes me wonder if you had been given lenses that started at small corrections, and you switched them out for greater corrections could allow your brain to adjust. Like the Invisalign of glasses. People are often able to adjust to diminishing eyesight, adapting and finding ways to make use of what is left, so it seems that if your vision got slightly better every two weeks, your brain could adapt and adjust. Hell, people are able to adjust to wearing mirror glasses that flip everything upside down, so eventually your brain would probably adjust and correct for the size difference.