Abstract
PurposeThe aim of this study was to assess the impact of cataract progression using the Haigis formula-calculated intraocular lens (IOL) power and investigate the accuracy of IOL power measured at different time points.MethodsThis prospective study was performed on 75 eyes of 75 patients who underwent uneventful cataract surgery. Preoperative ocular parameters including axial length (AL), keratometry (K), anterior chamber depth (ACD), corneal astigmatism, corrected distance visual acuity (CDVA) and uncorrected distance visual acuity (UDVA) examined at the two time points, more than 3 months preoperatively and preoperative 1 day were compared. The ocular parameters measured in the two time points were used to calculate the predicted implanted IOL power and the actual IOL power was chosen on the basis of parameters measured earlier before surgery using the Haigis formula. The mean numerical error (MNE) and mean absolute error (MAE) predicted by the two time points were also compared.ResultsThere were significant differences in the ACD, IOL power, UDVA and CDVA (P<0.01), but no statistical differences in AL, mean K and corneal astigmatism (P>0.05) during the average of 5.6 months before surgery. No statistically significant difference was detected in MNE (P>0.05), while the MAE had a significant difference in the two time points (P<0.05).ConclusionThe IOL power measured earlier before surgery might result in a higher accuracy and the postoperative refractive outcome tended towards emmetropia.
Highlights
Phacoemulsification is considered to be an effective surgery to cure cataracts, which has evolved to become a refractive procedure [1]
No statistically significant difference was detected in mean numerical error (MNE) (P>0.05), while the mean absolute error (MAE) had a significant difference in the two time points (P
The Intraocular lens (IOL) power measured earlier before surgery might result in a higher accuracy and the postoperative refractive outcome tended towards emmetropia
Summary
Phacoemulsification is considered to be an effective surgery to cure cataracts, which has evolved to become a refractive procedure [1]. The ocular biometry measurement and calculation formulas have been improved, refractive errors still exist with a mean absolute error (MAE) of 0.6 diopters (D) [2,3,4]. It was estimated that 35% of the IOL power calculation error was caused by an effective lens position (ELP) prediction error [4]. Among the existing calculation formulas, the third-generation formulas such as SRK-T, Holladay and Hoffer-Q only measure the axial length (AL) and mean keratometry (K), whereas recent formulas estimate ELP combined with the preoperative ACD measurement, which are more accurate in predicting the postoperative ELP and are more effective in cataract eyes with normal and long AL [6]. Measurement on ocular biometry was not repeated within 3 or 6 months, difference in IOL power was observed at different times before surgery. The purpose of this study was to investigate the impact of cataract progression on accuracy of IOL power measurement
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