Is my new prescription correct?

Posted , 2 users are following.

Hey all,

I recently went to a new eye specialist for a new prescription and upon returning home and comparing my new prescription to my previous one (3 years older,)I noticed that they varied quite a bit. Is the new prescription valid? since the new optician took the reading at 90deg, does it justify the drastic difference in spherical readings? Thanks for your help!

Old Prescription (Optometrist):

Right Eye:- SPH (-3.75), CYL (+1.25), AXIS (180)

Left Eye:-  SPH (-4.00), CYL (+1.25), AXIS (175)


New Prescription (ophthalmologist):

Right Eye:- SPH (-2.50), CYL (-1.50), AXIS (90)

Left Eye:-  SPH (-3.25), CYL (-1.50), AXIS (90)

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4 Replies

  • Posted

    Joe, not your doctor. Your pharmicist will likely answer your questions, the one who sells you your precriptions. They do it for free.
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    • Posted

      Unfortunately where I live there are no pharmacists involved in getting an eye test & prescription. These tests are only performed by respective profesionals and the person at the front desk is just a 'receptionist'.
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  • Posted


    The prescription seems to be correct. The reason why the new prescription is at axis 90 and the old one is at axis 180 and 170 is because they are written in different forms.

    When translating the old prescription into the minus cyl form (as your new prescription), it is:

    Right Eye: -2.50/-1.25 x 90

    Left Eye: -2.75/-1.25 x 85

    Comparing to the new prescription:

    Right Eye: -2.50/-1.50 x 90

    Left Eye: -3.25/-1.50 x 90

    You can see that there is a small change in your prescription over the last 3 years, which is normal. There is a very small increase in the cyl component (astigmatism) in your right eye, and there is a small increase in the sph (spherical) component and cyl in your left eye.

    As with any new glasses, especially if the cyl component has changed (even very slightly in some individuals!), your brain will need a bit of time to adapt to it. The adaptation period usually will take about 1-2 weeks of full time wear. Everyone is different and takes different amount of time to adapt to new glasses and some feels the effects of new glasses more.

    I hope this helps.


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Thanks for your help!

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