title: Interchangeability between Pentacam and IOLMaster in phakic intraocular lens calculation.
abstract: OBJECTIVE
  To evaluate the agreement and interchangeability between IOLMaster and Pentacam in phakic intraocular lens (IOL) calculations.
  
  
  METHODS
  This was a prospective study involving measurement of the anterior segment parameters anterior chamber depth (ACD), white to white (WTW) line, and average anterior corneal curvature (K-reading) on 108 healthy eyes of 56 consecutive patients. Interdevice agreement and interchangeability in phakic IOL calculations was evaluated.
  
  
  RESULTS
  Pentacam measured significantly longer ACD measurements (3.54 ± 0.35 mm) than the IOLMaster (3.40 ± 0.37 mm) (p&lt;0.0001); on the other hand, it measured significantly shorter WTW line measurements (11.61 ± 0.44 mm) than the IOLMaster (11.66 ± 0.42 mm) (p = 0.016). No difference was found regarding the average K-readings. For biometry and phakic IOL power calculation, there was no clinically significant difference between the devices, but for phakic IOL diameter calculation the difference was clinically significant.
  
  
  CONCLUSIONS
  There is a good agreement in ACD and K-readings between Pentacam and IOLMaster, making them interchangeable in biometry and phakic IOL power calculation, but they are not interchangeable regarding WTW line measurement; the difference will affect the phakic IOL diameter, which would affect lens safety.
authors.affiliation: Department of Ophthalmology, Sohag Faculty of Medicine, Sohag University, Sohag - Egypt.
authors.forename: Khulood M
authors.initials: KM
authors.lastname: Sayed
authors.forename: Alahmady H
authors.initials: AH
authors.lastname: Alsamman
mesh_terms: D000328:Adult; D000867:Anterior Chamber / Q000473:pathology*; D058452:Axial Length, Eye / Q000473:pathology*; D003315:Cornea / Q000473:pathology*; D063171:Corneal Pachymetry; D019781:Corneal Topography; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged; D055095:Optics and Photonics; D054120:Phakic Intraocular Lenses; D010781:Photography / Q000295:instrumentation*; D011446:Prospective Studies; D055815:Young Adult