PROJECT HYPEROPIC POWER PREDICTION II: THE EFFECTS OF SECOND EYE REFINEMENT METHODS ON PREDICTION ERROR IN HYPEROPIC EYES

Evaluating the accuracy of second eye refinement methods in a patient cohort with short axial eye length to assess the performance of IOL power calculation schemes in highly hyperopes.

Augen- und Laserklinik, Castrop-Rauxel, Germany

Single center, single surgeon retrospective consecutive case series. Inclusion of patients after uneventful bilateral cataract surgery implanting either spherical (SA60AT) or aspheric (ZCB00) IOLs. Inclusion criteria were axial eye length ≤21.5 mm and/or emmetropizing IOL power >28.5. Outcome measures were: mean absolute prediction error (MAE), median absolute prediction error, mean prediction error with standard deviation and median prediction error, as well as percentage of eyes with a MAE within 0.25 dpt, 0.5 dpt, 0.75 dpt and 1.0 dpt.

A total of 55 patients were assessed. Refined Kane and refined Okulix provided a smaller MAE compared to other methods. A statistically significant reduction in MAE after second eye refinement was observed for Castrop, Haigis, Hoffer Q, Holladay II, Okulix, Pearl and SRK/T formulae.

In our patient cohort with short axial eye length, second eye refinement led to a lower MAE in almost all formulae. The use of refinement in Kane, Okulix, PEARL-DGS, or Castrop formulae showed the lowest MAE.