A New Posterior Chamber Intraocular Lens Formula for Axial Myopes

John T. Thompson, A. Edward Maumenee, C. C. Baker

Research output: Contribution to journalArticlepeer-review


The accuracy of prediction of postoperative refractive error was evaluated in 175 patients with extracapsular cataract extraction and a Shearingstyle posterior chamber intraocular lens. The Binkhorst, Colenbrander-Hoffer and SRK formulas were all less accurate in patients with an axial length greater than or equal to 24.5 mm. The standard error of the estimates of the Binkhorst formula was 1.2 diopters, the Colenbrander-Hoffer formula 1.18 diopters and the SRK formula 0.90 diopters. A new intraocular-lens formula for axial myopes was derived by polynomial regression analysis with a standard error of the estimate of 0.85 diopters. This new formula was accurate within 1 diopter in 79% of axial myopes compared to 71 % for the SRK, 66% for the ColenbranderHoffer and 64% for the Binkhorst formulas. Regression analysis of a surgeon's own patient data can further improve the accuracy of prediction of the postoperative refraction.

Original languageEnglish (US)
Pages (from-to)484-488
Number of pages5
Issue number5
StatePublished - Jan 1 1984


  • cataract
  • intraocular lens
  • intraocular lens formula
  • myopia
  • postoperative refraction
  • regression analysis

ASJC Scopus subject areas

  • Ophthalmology


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