title: Comparison of age-derived lens thickness to optically measured lens thickness in IOL power calculation: a clinical study.
abstract: OBJECTIVE
  To assess whether lens thickness derived from age should be used in intraocular lens (IOL) power calculation.
  
  
  METHODS
  Ninety-three eyes underwent optical low coherence reflectometry (OLCR) prior to cataract surgery. Lens thickness (LT) by OLCR was used to calculate the IOL power. The mean absolute refractive error (MAE) and mean refractive error (ME) were calculated. Regression analysis between age and LT was performed. The expected IOL power, MAE, and ME were calculated with two age-derived lens thickness formulae: LT=4+(age/100) and LT=3.81+(0.0119×age).
  
  
  RESULTS
  Lens thickness by OLCR was not significantly different from that by age, but the IOL power was different. Refractive outcome was better with OLCR-based LT. Correlation between age and LT was not as linear as implied by the formulae.
  
  
  CONCLUSIONS
  In its current form, age-derived LT should not be used in IOL power calculation.
authors.affiliation: DuPage Ophthalmology, Lombard, Illinois 60148, USA. sheridanlam@live.com
authors.forename: Sheridan
authors.initials: S
authors.lastname: Lam
mesh_terms: D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D000375:Aging / Q000502:physiology*; D001699:Biometry / Q000379:methods; D005260:Female; D006801:Humans; D007368:Interferometry; D019654:Lens Implantation, Intraocular; D007908:Lens, Crystalline / Q000473:pathology*; D007910:Lenses, Intraocular; D008027:Light; D008297:Male; D008875:Middle Aged; D055095:Optics and Photonics; D018918:Phacoemulsification; D014792:Visual Acuity / Q000502:physiology