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How accurate is ORA?

Posted , 5 users are following.

soks
soks

How accurate is ORA?  Is ORA accurate, including for astigmatism?

When do they determine what power lens you need?

0 likes, 5 replies

5 Replies

  • lin59
    lin59 soks

    Posted

    I don't know but I got a lot of links when I did a search for ORA accuracy astigmatism. Also, I had cataract surgery after having had LASIK and they often use ORA for that, but I didn't have ORA and mine turned out fine.

  • lin59
    lin59 soks

    Posted

    Or just search for ORA eye accuracy.
  • soks
    soks

    Posted

    Without ORA, how do they determine the IOL that you need?
    • Night-Hawk
      Night-Hawk soks

      Posted

      ORA only helps confirm the IOL realtime refraction results during surgery, it can help fine tune the axis angle for example for a toric IOL.

      The surgeon prior to surgery based on the biometric measurements they do on your cornea a week or so before surgery can calculate the power and cylinder + axis your eye should require.  But it can never be exact, since the IOLs typically come in 0.5D steps. Also how the cornea ends up after it heals can cause some uncertainty too especially with regards to residual astigmatism. Based on the calculations, the surgeon orders the IOL with the closest power a few days before the surgery.

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