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

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.

[1]  M. Blumenkranz,et al.  Silicone oil for the treatment of severe proliferative diabetic retinopathy. , 1989, Ophthalmology.

[2]  H. Hashemi,et al.  REFRACTIVE OUTCOME OF SILICONE OIL REMOVAL AND INTRAOCULAR LENS IMPLANTATION USING LASER INTERFEROMETRY , 2005, Retina.

[3]  J. Stafiej,et al.  Changes in axial length after retinal detachment surgery. , 1999, European journal of ophthalmology.

[4]  C K Hitzenberger,et al.  Measurement of the axial length of cataract eyes by laser Doppler interferometry. , 1993, Investigative ophthalmology & visual science.

[5]  B. Lege,et al.  Comparison of immersion ultrasound biometry and partial coherence interferometry for intraocular lens calculation according to Haigis , 2000, Graefe's Archive for Clinical and Experimental Ophthalmology.

[6]  C. Flaxel,et al.  Phacoemulsification and silicone oil removal through a single corneal incision. , 1998, Ophthalmology.

[7]  S. deBustros,et al.  Refractive changes after scleral buckling surgery. , 1989, A M A Archives of Ophthalmology.

[8]  C. Bunce,et al.  Combined phacoemulsification and transpupillary drainage of silicone oil: results and complications , 2001, The British journal of ophthalmology.

[9]  O. Çekiç,et al.  Severe ocular trauma managed with primary pars plana vitrectomy and silicone oil. , 1998, Retina.

[10]  O. Durrani,et al.  Biometry of the silicone oil-filled eye: II , 1999, Eye.

[11]  Douglas G. Altman,et al.  Practical statistics for medical research , 1990 .

[12]  M. Rajan,et al.  Partial coherence laser interferometry vs conventional ultrasound biometry in intraocular lens power calculations , 2002, Eye.

[13]  K. M. Rashad,et al.  Intraoperative Biometry for Intraocular Lens (IOL) Power Calculation at Silicone Oil Removal , 2003, European journal of ophthalmology.

[14]  H. Ghoraba,et al.  THE PROBLEMS OF BIOMETRY IN COMBINED SILICONE OIL REMOVAL AND CATARACT EXTRACTION: A Clinical Trial , 2002, Retina.

[15]  G. Malukiewicz-Wiśniewska,et al.  Changes in Axial Length after Retinal Detachment Surgery , 1999, European journal of ophthalmology.

[16]  C. Flaxel,et al.  Phacoemulsification combined with silicone oil removal through posterior capsulorhexis , 2000, The British journal of ophthalmology.

[17]  M. Gonvers.  Temporary silicone oil tamponade in the treatment of complicated diabetic retinal detachments , 2004, Graefe's Archive for Clinical and Experimental Ophthalmology.

[18]  M. Benson,et al.  Biometry of the silicone oil-filled eye , 1999, Eye.

[19]  Wolfgang Drexler,et al.  Optical biometry in cataract surgery. , 2002, Developments in ophthalmology.

[20]  Y. Sekine,et al.  Measurement of axial length of eyes with incomplete filling of silicone oil in the vitreous cavity using x ray computed tomography , 2002, The British journal of ophthalmology.

[21]  P. Leaver,et al.  Cataract extraction following vitrectomy and silicone oil tamponade , 1995, Eye.

[22]  R. Gray,et al.  Cataract extraction following vitrectomy and silicone oil tamponade. , 1996, Eye.

[23]  G. Hanselmayer,et al.  Biometry and refractive outcome of eyes filled with silicone oil by standardized echography and partial coherence interferometry , 2005, Graefe's Archive for Clinical and Experimental Ophthalmology.

[24]  B. Becker,et al.  The use of liquid silicone in retinal detachment surgery. , 1962, Archives of ophthalmology.