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It’s your age.
This sucks.
I spent a fortune on fancy pants occupational lenses (and new frames) back in May last year, and I'm already having to go back to get a new prescription, as my vision has deteriorated noticeably in that time.
On the upside, age related deterioration is apparently not a linear thing, and happens in fits and starts.
It’s your age. The cornea hardens as you get older and your vision starts to impair. In and around 40 is the most common age for this to happen.