Just out of interest, since you are into IT I suspect you spend a lot of time at a workscreen, you might find it worth using specs for that as well as reading. You can do the sums as to what strength you need if you suss out what distance you sit from the screen.
In the days when I was employed my employer was happy both to provide me with a regular eye test and supply the specs; if you are self-employed you might be able to set things off against your tax, if you think it's worth it.