J Korean Ophthalmol Soc.  2013 Feb;54(2):257-264. 10.3341/jkos.2013.54.2.257.

Effects of Axial Length and Vitrectomy on Refractive Error after Cataract Surgery Using SRK/T Formula

• Lee MK
• Hwang KY
• Kim MS

• KMID: 2216661
• DOI: http://doi.org/10.3341/jkos.2013.54.2.257

Abstract

PURPOSE
To investigate the error tendency between preoperative target diopter and postoperative manifest refraction in cataract surgery cases and the effect of axial length and vitrectomy on refractive error (RE).
METHODS
We retrospectively studied 90 eyes of 90 patients who underwent cataract surgery. The power of intraocular lens (IOL) was calculated by SRK/T formula. Patients were devided into four groups based on axial length (AXL) and the past history of vitrectomy.
RESULTS
The mean of RE showed no significant difference between groups. But an increasing AXL was associated with increased myopic shift with normal range AXL (< or =24.4 mm) (r = -0.502, p = 0.005) and increased hyperopic shift with long AXL (>24.4 mm) (r = 0.718, p < 0.001). In vitrectomized eyes, it showed no significant refractive shift with both normal range and long AXL.
CONCLUSIONS
When determining IOL power using SRK/T formula in nonvitrectomized eyes, postoperative refractive shift based on axial length should be considered.

Keyword

Axial length; Cataract surgery; Effective lens position; Refractive error; Vitrectomy

MeSH Terms

Cataract
Eye
Humans
Lenses, Intraocular
Reference Values
Refractive Errors
Retrospective Studies
Vitrectomy

Figure

• 

  Figure 1. Correlation between axial length and refractive error after cataract surgery. Correlation is more significant at 2 month than 1 month after surgery in nonvitrectomized patient (A, B). Vitrectomized patient showed no significant correlation in both normal range (C) and long axial length (D). Refractive error = (Postoperative spherical equivalent) - (Target diopter); r = Pearson correlation coefficient in A and B; r = Spearman rho in C and D.

Reference

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