I suggest Jake's method of measurement for you. Since you have a -4 diopter prescription, you should be able to read clearly at 10 inches. (25 cm).
When i suggest self measurement, I do say, "do this every day". I say, do is for comfort, and a reference by which you can judge any success you achieve.
I do this to say you money. If you must go to an optometrist - your measurements get very expensive indeed.
In fact, I agree the once you get set with your base-line measurement, you do not have to do them anymore - for several moths. We all know that change is very slow. But, like weight-loss, you must establish a base line - to objectively tell if you have any effect at all.
Yes Otis sir .
I do have a snellen hung in my garden. But i dont want to see it,i saw it for the first two weeks everyday and found no change ,it demotivates me. Like we dont check the weight everyday in the gym,i feel we should not check the snellen e everyday. I will check it once a month.