T. Olsen et H. Gimbel, PHACOEMULSIFICATION, CAPSULORHEXIS, AND INTRAOCULAR-LENS POWER PREDICTION ACCURACY, Journal of cataract and refractive surgery, 19(6), 1993, pp. 695-699
Phacoemulsification with capsulorhexis reduces the surgical variabilit
y and may result in a more predictable refractive outcome. To evaluate
the prediction accuracy with current lOL power prediction formulas, w
e reviewed a retrospective series of 628 phacoemulsification cases, in
cluding 148 short (<22 mm) and 80 long (>25 mm) eyes. Using the Binkho
rst II formula and the manufacturer's recommended anterior chamber dep
th (ACD) values, the mean absolute refractive prediction error was 0.5
6 diopters (D). This error could be reduced to 0.51 D by retrospective
ly optimizing the ACD values for each lens type. Under similar least e
rror conditions, the mean error was 0.51 D with the SRK/T formula and
0.47 D with the Olsen formula (P <.01). The Binkhorst formula overesti
mated the refraction in short eyes and underestimated the refraction i
n long eyes. The SRK/T and the Olsen formula were unbiased with the ax
ial length. We hypothesize that the high prediction accuracy may be pa
rtially explained by a more predictable pseudophakic ACD with the curr
ent surgical technique.