Ah, the "I don't need glasses, it is only that my arm is too short" effect. That's a well known ageing process. The lens of the eye is an elastic body that boun

Ah, the "I don't need glasses, it is only that my arm is too short" effect. That's a well known ageing process. The lens of the eye is an elastic body that bounces back to a more spherical form if you focus on something in the near, but over the years the material becomes less and less elastic, so the nearest point you can focus on moves further and further away. (That is on reason why small children trying to show you something hold it right in front of your nose: for them it is the distance where they can see small things best.)