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Br J Ophthalmol 2009;93:502-505 doi:10.1136/bjo.2008.147868
  • Clinical science
    • Original Article

Comparison of A-scan and MRI for the measurement of axial length in silicone oil-filled eyes

  1. G Bencic1,
  2. Z Vatavuk1,
  3. M Marotti2,
  4. V L Loncar1,
  5. I Petric1,
  6. B Andrijevic-Derk1,
  7. J Skunca1,
  8. Z Mandic1
  1. 1
    University Department of Ophthalmology, University Hospital “Sestre milosrdnice”, Zagreb, Croatia
  2. 2
    University Department of Radiology, University Hospital “Sestre milosrdnice”, Zagreb, Croatia
  1. Dr G Bencic, University Department of Ophthalmology, University Hospital “Sestre milosrdnice”, Vinogradska 29, Zagreb, Croatia; goranbencic{at}hotmail.com
  • Accepted 9 November 2008
  • Published Online First 15 December 2008

Abstract

Aims: The aim of the study was to compare the accuracy of A-scan biometry and MRI for the measurement of axial length in silicone oil-filled eyes.

Methods: This was a prospective randomised study of 70 patients. Biometry was performed using MRI in 33 patients (MRI group) and A-scan echography in 37 patients (A-scan group). The difference between predicted and final refraction was measured and evaluated statistically.

Results: In patients with axial length ≥26 mm, the mean deviation of the final from predicted refraction was −1.23 (SD 0.67) D in the MRI group and −2.3 (SD 2.02) D in the A-scan group. The difference between these two groups was statistically significant (p = 0.02). In patients with axial length <26 mm, the mean deviation of the final from predicted refraction was −0.12 (SD 1.29) D in the MRI group and −0.33 (SD 1.39) D in the A-scan group. There was no statistical significance between the two groups (p = 0.629).

Conclusion: For highly myopic patients MRI biometry was a more accurate measurement of axial length in silicone oil-filled eyes. A-scan and MRI biometry were comparably accurate in measuring axial length in patients with axial length <26 mm.

Footnotes

  • Funding: None.

  • Competing interests: None.

  • Ethics approval: Obtained.

  • Patient consent: Obtained.

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