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    Analyzing corneal asphericity, OCT angiography, and balance control issues in glaucoma patients

    Cataract surgery: corneal asphericity affects refractive outcome

    When using third-generation IOL power formulas, be sure to take anterior surface corneal asphericity into consideration because it can influence the refractive outcome, according to researchers from Italy and the United States.

    More in this issue: Metrics help explain balance issues in glaucoma patients

    Reporting in the Journal of Cataract and Refractive Surgery, the researchers conducted a retrospective comparative case series of 115 eyes in 115 consecutive patients, all of which were implanted with the same type of intraocular lens (Acrysof SA60AT, Alcon).

    The researchers calculated intraocular lens power using the Haigis, Hoffer Q, Holladay 1, and SRK/T formulas. Asphericity (Q-value) was measured by three different methods: a Placido-disk corneal topographer, a rotating Scheimpflug camera, and a rotating Scheimpflug camera combined with Placido-disk corneal topography All measurements were conducted at 8.0 mm.

    By linear regression, the relationship between the error in refraction prediction (as measured 1 month post-surgery) and the Q-value was assessed.

    The researchers found that with all of the formulas and devices, there was a statistically significant relationship between the error in refraction prediction and the Q-value with all formulas: A more negative Q-value (prolate cornea) was associated with a myopic outcome in all cases, whereas a more positive Q-value (oblate cornea) was associated with a hyperopic outcome.

    To read the abstract of the study, click here.

    Next: OCT angiography useful in patients with diabetic retinopathy

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