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Contact Lense - Overcorrection

  • 12-11-2022 11:33pm
    Registered Users Posts: 212 ✭✭ TheGlossy

    Hi all,

    Today, I had my eye appointment and I am completely confused by my new prescription. My gut is telling me something is off about this.

    My eye sight test came out as follows:

    -5.25 Right eye

    -5.75 Left eye

    Yet, my contact lense prescription is -5.50 for both. One eye is always under corrected to give both eyes the same contact lense power which is fine (my contact lense prescription has always been this way). Yet, one eye is now overcorrected by 0.25 which I don’t understand.

    Normally, one eye is adequately corrected and the other is under corrected to have both match lenses wise but this time the lense prescription is under correction on one eye and over correction on the other.

    My previous eye test was -5.00 right and 5.25 left, so the contact lense specialist prescribed -5.00 for both eyes for contact lenses.

    I’m completely confused by this new prescription which does not seem right to me at all.

    Should I ring the contact lense specialist? Is an overcorrection of 0.25 bad?


  • Registered Users Posts: 232 ✭✭ mct1

    Having worn contact lenses for decades I've long noticed that CL prescriptions don't always correspond exactly to your sight test prescription. Mine are usually slightly different, the CL strength being chosen according to different criteria to spectacle lenses. This was once explained to me but I've forgotten the details..

    As long as your vision is satisfactory with the CLs and there's no obvious eyestrain eg headaches from computer work, they should be fine. But if you're concerned then to put your mind at rest you can just ring or email your CL optician to check.