title: The accuracy of axial length measurements in cases of macula-off retinal detachment.
abstract: OBJECTIVE
  To assess the accuracy of axial length measurements in cases of macula-off retinal detachment using different methods (optical biometry, A-scan ultrasound, and combined applanation vector-A/B-scan biometry).
  
  
  METHODS
  This prospective clinical study included 100 eyes of 100 patients who underwent vitrectomy alone or phacovitrectomy for macula-off retinal detachment. All patients included signed an informed consent. Preoperative examination of the patients included recording the axial length measurements using optical biometry, A-scan ultrasound, and combined applanation vector-A/B-scan biometry.
  
  
  RESULTS
  The mean postoperative IOLMaster axial length after macular reattachment was 26.11 ± 2.91 mm. The mean preoperative IOLMaster axial length with macula-off was 25.32 ± 2.72 mm. The mean preoperative A-scan axial length with macula-off was 25.29 ± 2.80 mm. The mean preoperative vector-A/B-scan axial length with macula-off was 26.03 ± 2.90 mm. The preoperative vector-A/B-scan mean absolute error was 0.59 ± 0.48 D (range, 0.10-2.25 D).
  
  
  CONCLUSIONS
  Regular methods (optical biometry and A-scan biometry) of measuring the axial length in cases with a detached macula proved to be variable and less accurate. The vector-A/B-scan offered good measurements of the actual axial length in the patients. This was reflected on more accurate postoperative refractive outcome.
authors.affiliation: Ophthalmology Department, Faculty of Medicine, Alexandria University, Alexandria, Egypt.
authors.forename: Mohsen
authors.initials: M
authors.lastname: Abou-Shousha
authors.affiliation: Ophthalmology Department, Faculty of Medicine, Alexandria University, Alexandria, Egypt. Electronic address: hany209209@yahoo.com.
authors.forename: Hany Ahmed
authors.initials: HA
authors.lastname: Helaly
authors.affiliation: Ophthalmology Department, Faculty of Medicine, Alexandria University, Alexandria, Egypt.
authors.forename: Ihab Mohamed
authors.initials: IM
authors.lastname: Osman
mesh_terms: D000328:Adult; D000368:Aged; D058452:Axial Length, Eye; D001699:Biometry / Q000379:methods*; D003941:Diagnostic Techniques, Ophthalmological; D005260:Female; D006801:Humans; D008266:Macula Lutea; D008297:Male; D008875:Middle Aged; D018918:Phacoemulsification; D011446:Prospective Studies; D015203:Reproducibility of Results; D012163:Retinal Detachment / Q000150:complications* / Q000601:surgery; D014792:Visual Acuity; D014821:Vitrectomy; D055815:Young Adult