Concern on my prescription after my eye test?

Question

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

Answer 1

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.

Answer 2

Just remember when you see the Optometrist that you tell him what looks the best to you, so you pretty much pick your RX. But there is no reason to worry you see most people don't notice a .25 change. And actually the ANSI standards only require your glasses to be within .12 of the RX perscribed. About 95% of the population doesn't notice that .25. So don't be alarmed it's very common.

Answer 3

Your point 2 sums it up. The eye test shows what you saw as the right answer on that day. Things change with your blood pressure, salt levels, caffeine intake and all sorts of other things. 0.25 dioptre is a small change unless it takes you to the limit of focus of your eyes. Probably more important at distance vision

Answer 4

the change in your prescription is not that big and 0.25 is very normal not to find the different enjoy your new glasses. ;-)

Answer 5

no you will fail you may slip with 20/40 yet its no longer the top of the international they are going to ask you to return once you have glasses to end the try. i'm going to propose a much less costly pair of frames with anti glare coating plastic frames are terrific. after all no experience in getting a $4 hundred.00 set of frames once you going to get messy.. word they could additionally enable it flow altogether and you will get glasses in hassle-free.

Answer 6

sometimes the change is not significant enough to require a change in Rx. if you feel your sight is deteriorating though . go back and have it repeated. If you are diabetic, your Rx may change regularly depending on how well controlled your diabetes is