title: Comparison of immersion ultrasound, partial coherence interferometry, and low coherence reflectometry for ocular biometry in cataract patients.
abstract: OBJECTIVE
  To compare ocular biometry parameters measured with immersion ultrasound, partial coherence interferometry, and low coherence reflectometry in cataract patients.
  
  
  METHODS
  Measurements of axial length and anterior chamber depth were analyzed and compared using immersion ultrasound, partial coherence interferometry, and low coherence reflectometry. Keratometry (K), flattest axis, and white-to-white measurements were compared between partial coherence interferometry and low coherence reflectometry. Seventy-eight cataract (LOCS II range: 1 to 3) eyes of 45 patients aged between 42 and 90 years were evaluated. A subanalysis as a function of cataract degree was done for axial length and anterior chamber depth between techniques.
  
  
  RESULTS
  No statistically significant differences were noted for the study cohort or within each cataract degree among the three techniques for axial length and anterior chamber depth (P>.05, ANOVA test). Measurements between techniques were highly correlated for axial length (R=0.99) and anterior chamber depth (R=0.90 to 0.96) for all methods. Keratometry, flattest axis, and white-to-white measurements were comparable (paired t test, P>.1) and correlated well between partial coherence interferometry and low coherence reflectometry (K1 [R=0.95), K2 [R=0.97], flattest axis [R=0.95], and white-to-white [R=0.92]).
  
  
  CONCLUSIONS
  Immersion ultrasound, partial coherence interferometry, and low coherence reflectometry provided comparable ocular biometry measurements in cataractous eyes.
authors.affiliation: Department of Optics, University of Valencia, Valencia, Spain. robert.montes@uv.es
authors.forename: Robert
authors.initials: R
authors.lastname: Montés-Micó
authors.forename: Francesco
authors.initials: F
authors.lastname: Carones
authors.forename: Antonietta
authors.initials: A
authors.lastname: Buttacchio
authors.forename: Teresa
authors.initials: T
authors.lastname: Ferrer-Blasco
authors.forename: David
authors.initials: D
authors.lastname: Madrid-Costa
mesh_terms: D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D000867:Anterior Chamber / Q000473:pathology*; D058452:Axial Length, Eye / Q000473:pathology*; D001699:Biometry / Q000379:methods*; D001837:Body Weights and Measures; D002386:Cataract / Q000473:pathology*; D003941:Diagnostic Techniques, Ophthalmological / Q000295:instrumentation*; D005260:Female; D006801:Humans; D007368:Interferometry; D008297:Male; D008875:Middle Aged; D014463:Ultrasonography