title: Clinically relevant biometry.
abstract: OBJECTIVE
  Obtaining precise postoperative target refraction is of utmost importance in today's modern cataract and refractive surgery. Given the growing number of patients undergoing premium intraocular lens (IOL) implantations, patient expectation continues to rise. In order to meet heightened patient expectations, it is crucial to pay utmost attention to patient selection, accurate keratometry and biometry readings, as well as to the application of correct IOL power formula with optimized lens constants. This article reviews recent advances in the field of clinical biometry and IOL power calculations.
  
  
  RESULTS
  Recently developed low-coherence reflectometry optical biometry is comparable to older ultrasonic biometric and keratometric techniques. In addition, the new IOLMaster software upgrade has improved reproducibility and enhanced signal acquisition. Further, the modern lens power formulas currently determine the effective lens position and the shape of the intraocular lens power prediction curve more accurately.
  
  
  CONCLUSIONS
  In order to reach target refraction, precise biometric measurements are imperative. Understanding the strengths and limitations of the currently available biometry devices allows prevention of high variability and inaccuracy, ultimately determining the refractive outcomes.
authors.affiliation: Ocular Surface Imaging Center, Cornea & Refractive Surgery Service, Massachusetts Eye & Ear Infirmary, and Department of Ophthalmology, Harvard Medical School, Boston, Massachusetts 02114, USA.
authors.forename: Afsun
authors.initials: A
authors.lastname: Sahin
authors.forename: Pedram
authors.initials: P
authors.lastname: Hamrah
mesh_terms: D001699:Biometry / Q000379:methods*; D003315:Cornea / Q000473:pathology*; D006801:Humans; D007910:Lenses, Intraocular / Q000592:standards
references.citation: J Cataract Refract Surg. 2010 Sep;36(9):1466-73
references.pmid: 20692556
references.citation: J Refract Surg. 2011 Sep;27(9):665-71
references.pmid: 21323302
references.citation: Ophthalmology. 2010 Feb;117(2):400-1; author reply 401
references.pmid: 20141858
references.citation: J Refract Surg. 2009 Oct;25(10):862-8
references.pmid: 19835326
references.citation: Optometry. 2010 Jan;81(1):35-9
references.pmid: 20004876
references.citation: Ophthalmology. 2011 May;118(5):940-4
references.pmid: 21131054
references.citation: J Refract Surg. 2010 May;26(5):341-7
references.pmid: 20506991
references.citation: J Refract Surg. 2009 Mar;25(3):285-9
references.pmid: 19370824
references.citation: Curr Opin Ophthalmol. 2008 Jan;19(1):13-7
references.pmid: 18090891
references.citation: J Cataract Refract Surg. 2009 Dec;35(12):2176-7; author reply 2177-8
references.pmid: 19969238
references.citation: J Cataract Refract Surg. 2010 Apr;36(4):644-8
references.pmid: 20362858
references.citation: J Cataract Refract Surg. 2010 Sep;36(9):1455-65
references.pmid: 20692555
references.citation: Am J Ophthalmol. 1998 Oct;126(4):524-34
references.pmid: 9780097
references.citation: J Cataract Refract Surg. 2009 Apr;35(4):650-62
references.pmid: 19304085
references.citation: Acta Ophthalmol Scand. 2007 Aug;85(5):472-85
references.pmid: 17403024
references.citation: Invest Ophthalmol Vis Sci. 2011 Jun 23;52(7):4525-33
references.pmid: 21436280
references.citation: J Cataract Refract Surg. 2008 Mar;34(3):368-76
references.pmid: 18299059
references.citation: J Cataract Refract Surg. 2010 May;36(5):790-8
references.pmid: 20457371
references.citation: J Refract Surg. 2009 Dec;25(12):1061-74
references.pmid: 20000287
references.citation: Optom Vis Sci. 2011 Aug;88(8):912-9
references.pmid: 21552178
references.citation: J Cataract Refract Surg. 2011 Jan;37(1):63-71
references.pmid: 21183100
references.citation: Br J Ophthalmol. 2010 May;94(5):666-7
references.pmid: 20447976
references.citation: J Cataract Refract Surg. 2011 Mar;37(3):513-7
references.pmid: 21244866
references.citation: Ophthalmology. 2010 Apr;117(4):711-6
references.pmid: 20097425
references.citation: J Refract Surg. 2010 Jun;26(6):430-7
references.pmid: 20677729
references.citation: J Cataract Refract Surg. 2010 Jul;36(7):1081-9
references.pmid: 20610083
references.citation: Acta Ophthalmol Scand. 2007 Feb;85(1):84-7
references.pmid: 17244216
references.citation: Arch Ophthalmol. 2004 Feb;122(2):159-66
references.pmid: 14769590
references.citation: Br J Ophthalmol. 2009 Jun;93(6):807-10
references.pmid: 19289385
references.citation: Ophthalmology. 2009 Nov;116(11):2087-92
references.pmid: 19744720
references.citation: J Cataract Refract Surg. 2010 Sep;36(9):1474-8
references.pmid: 20692557
references.citation: Br J Ophthalmol. 2009 Jul;93(7):949-53
references.pmid: 19380310
references.citation: J Cataract Refract Surg. 2011 Jan;37(1):45-9
references.pmid: 21071170
references.citation: J Cataract Refract Surg. 2010 Feb;36(2):230-4
references.pmid: 20152602
references.citation: Eye (Lond). 2011 Jun;25(6):717-24
references.pmid: 21394115
references.citation: J Cataract Refract Surg. 2009 Jul;35(7):1198-203
references.pmid: 19545808
references.citation: J Cataract Refract Surg. 2010 Nov;36(11):1829-34
references.pmid: 21029888
references.citation: J Cataract Refract Surg. 2010 Jan;36(1):87-96
references.pmid: 20117710
references.citation: J Cataract Refract Surg. 2005 Mar;31(3):562-70
references.pmid: 15811746
references.citation: Optometry. 2011 Mar;82(3):140-7
references.pmid: 20933477