title: Lenstar versus ultrasound for ocular biometry in a pediatric population.
abstract: OBJECTIVE
  To compare the central corneal thickness (CCT), axial length (AL), anterior chamber depth (ACD), and lens thickness (LT) measured with Lenstar with those obtained with ultrasound pachymetry and A-scan contact ultrasound (ASU) in children.
  
  
  METHODS
  ODs of 565 school children were included. All measurements were obtained 30 min after instilling 1% tropicamide. For each instrument, three consecutive measurements per each child were performed. Initially, examiner 1 performed measurements with Lenstar to obtain CCT, AL, ACD, and LT. Later, examiner 2 performed measurements with corneal pachymetry to obtain CCT. Finally, ASU was used by examiner 2 to obtain AL, ACD, and LT. Four parameters obtained with Lenstar were compared with those obtained with pachymetry and ASU using Pearson correlation coefficients (r) and Bland-Altman analyses.
  
  
  RESULTS
  Lenstar measurements were obtained in 557 of 565 subjects(mean age; 10.48 ± 2.11 years, mean spherical equivalent of the ODs; +0.47 ± 1.18 diopters) whereas ASU and pachymetry could be performed in 530 of 565. Four hundred seventy-nine subjects were statistically assessed after 41 subjects were extracted as outliers from 530 subjects in whom all instruments could be performed. Mean difference between pachymetry and Lenstar was 13.20 ± 13.13 μm [95% confidence interval (CI): 12.01 to 14.37]. Mean difference between ASU and Lenstar was -0.72 ± 0.35 mm (95% CI: -0.75 to -0.69) for AL, -0.27 ± 0.32 mm (95% CI: -0.30 to -0.24) for ACD, and 0.24 ± 0.28 mm (95% CI: 0.22 to 0.27) for LT. R values were 0.912 (p < 0.001), 0.904 (p < 0.001), 0.487 (p < 0.001), 0.369 (p < 0.001) for CCT, AL, ACD, and LT respectively.
  
  
  CONCLUSIONS
  AL and ACD were found to be greater with Lenstar, whereas CCT and LT measures were smaller. It is concluded that there was agreement between instruments for CCT and ACD, because the small differences between measures were clinically insignificant. AL and LT values cannot be used interchangeably. If these differences are considered, Lenstar can replace ASU and pachymetry for the majority of children.
authors.affiliation: Department of Ophthalmology, Eskişehir Osmangazi University Medical Faculty, Eskişehir, Turkey. hhgursoy@hotmail.com
authors.forename: Huseyin
authors.initials: H
authors.lastname: Gursoy
authors.forename: Afsun
authors.initials: A
authors.lastname: Sahin
authors.forename: Hikmet
authors.initials: H
authors.lastname: Basmak
authors.forename: Ahmet
authors.initials: A
authors.lastname: Ozer
authors.forename: Nilgun
authors.initials: N
authors.lastname: Yildirim
authors.forename: Ertugrul
authors.initials: E
authors.lastname: Colak
mesh_terms: D000293:Adolescent; D000867:Anterior Chamber / Q000000981:diagnostic imaging*; D001699:Biometry / Q000295:instrumentation*; D002648:Child; D003315:Cornea / Q000000981:diagnostic imaging*; D004867:Equipment Design; D005260:Female; D005500:Follow-Up Studies; D006801:Humans; D015994:Incidence; D007908:Lens, Crystalline / Q000000981:diagnostic imaging*; D008297:Male; D033401:Microscopy, Acoustic / Q000295:instrumentation*; D012030:Refractive Errors / Q000175:diagnosis / Q000453:epidemiology; D015203:Reproducibility of Results; D041623:Tomography, Optical Coherence / Q000295:instrumentation; D014421:Turkey / Q000453:epidemiology; D015351:Vision Screening / Q000379:methods