Concern on my prescription after my eye test?!

Concern on my prescription after my eye test?

My previous prescription for my left eye was :
R: -4.00 +1.00 80
L: -2.25

However i had an eye test last 2 weeks and they told me the new one is:

R: -4.25 +1.25 85
L: -2.50

I m currently wearing a pair of glasses which follows my old prescription, how ever i couldnt really tell that 0.25 change on both my eyes when looking at things both near and far away from me with the old prescription glasses on.

1) Is this normal that unable to find out the difference of the 0.25, or it is just the error of the optometrist?

2) Is there any chance the eye test is not accurate and can only give out an approximate value??

Thanks

The reason you don't notice a great deal of change is because it was a subtle one. You are accustomed to forcing a focus with the old prescription, and it's not taking a lot to do it. The new prescription will relieve the need to do that, it's not that you can't do it- but you don't need to. The optometrist determined the new prescription based on what you said provided the best vision, he didn't just grab the numbers out of the air. And if he did a refractive error test using a computer assisted machine, it would have given him reading based on the measurements of your retina. While the difference in the prescriptions is small, you may notice in the long term you have less eye fatigue at the end of the day because you aren't forcing a focus. It's just a little bit, so the effect may take hours to notice, rather than just a few moments, and you may not notice a lot at all. If you don't like the script, go back to the optometrist for a re-exam.