Actual and intended refraction after cataract surgery

J Cataract Refract Surg. 2003 Nov;29(11):2189-94. doi: 10.1016/s0886-3350(03)00418-8.


Purpose: To demonstrate an analytical method to compare the actual and intended refraction after cataract surgery that allows incorporation of refractive surgical effects.

Setting: Corneal and External Eye Disease Service, Royal Liverpool University Hospital, Liverpool, United Kingdom.

Methods: The actual postoperative refraction was compared to the intended postoperative refraction before and after removal of surgically induced changes in keratometry; that is, the keratometric surgical effect. Application of hypothesis testing is demonstrated using a standardized method of analyzing refractive data; that is, refractive data transformed into the refractive power matrix with calculation of the mean and variance-covariance of the data.

Results: The method of analysis demonstrated how surgically induced changes in refractive components can be incorporated into hypothesis testing when comparing intended and actual postoperative refractions.

Conclusion: Application of the standardized method of analyzing refractive data allows a more accurate evaluation of methods or formulas used to calculate intraocular lens power in cataract surgery.

Publication types

  • Comparative Study

MeSH terms

  • Biometry
  • Cataract Extraction*
  • Cornea / physiology*
  • Corneal Topography
  • Humans
  • Lens Implantation, Intraocular*
  • Lenses, Intraocular
  • Models, Theoretical
  • Postoperative Period
  • Pseudophakia / physiopathology*
  • Refraction, Ocular / physiology*