UK. Will my prescription have changed?

I'm 47 and have worn very strong glasses since I was three. I was a -7 about six years ago and haven't had a test for about four years. I've been squinting at things a lot lately and find things are blurry. I was told that -7 is one of the more extreme prescriptions and not many people (unless... show more I'm 47 and have worn very strong glasses since I was three. I was a -7 about six years ago and haven't had a test for about four years.

I've been squinting at things a lot lately and find things are blurry.

I was told that -7 is one of the more extreme prescriptions and not many people (unless registered blind one assumes) have worse eyesight.

Advice please.
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