Jakey is right…try another optometrist. Can share my opthalmologist experience. Had been going to him since childhood. He had all my eye records.
At my last appointment with him, his assistant then he, both measured my vision using the autorefractor and the eye chart (this is the normal procedure at his clinic).
As per him, there was no change in my vision. I had to emphatically tell him 2-3 times that my then correction was too strong for me.
He became upset with me, trying to get him to lower my ‘prescription’. He then reduced it by 0.75 but was unhappy doing it. This time he did not even get me to read out the alphabets on the Snellen.
Fortunately, this was the week after beginning EM and I knew that this was an improvement. Ordered new glasses and even with the reduced number I could read 20/15 at night.
Opticians and even opthalmologists (most of them) do not reduce prescriptions, even if they see a marked improvement. They are so convinced that vision cannot be improved. It is better for all concerned if they are given no past prescription. That way even you would be about as sure as you could be, that the number given to you does not have a past bias.