I'm sure this has been covered but my eyesight is so changable at the moment I can't keep up. I used to have perfect vision and then i got a CSR (Central Screen Retinopathy - it's like a cyst in your eye but pushes into your focal point) which pused my retina away from the wall of my eye. The fluid has gone but the retina never returns flat so one eye is like I'm looking through oil. After that calmed down I got some glasses with a prism to make the eyesight line up.
However I feel that my vision changes so much. There are days when I can't read a poster on the wall that on other days it is as clear as day. Somedays I can use my computer all day without my glasses on, other days I would have to press my nose up against the monitor. I don't want to alert my colleagues to it (I think it's a pride thing - I am the youngest in my team by 30 years, I can't be losing my eyesight!?!).
When it is so changable I worry that I will lose my eyesight altogether - I know it's a bit dramatic but it does worry me.
Do other people see rapid non-permanent changes in their eyesight?