Computer varifocal lenses, Varilux Computer 3V or similar any good?

[Paddy]

I think mine may be better than 20/20 as I can easily read the bottom row (although my left eye is weaker than the right and will confuse a Y for a V)

Yes, 20/20 is somewhat an arbitrary scale of measurement and many people have much better vision.

The human eyeball is rarely perfect and the abrasions will warp shapes. There will be variations in shape depending on colour particularly red-green circles resulting in distortion on the letter "O" and even Cs & Gs etc.

It is very important to keep hydrated and to keep any diabetes under control in order to keep vision at its best.