May 2008
Volume 49, Issue 13
Free
ARVO Annual Meeting Abstract  |   May 2008
Correlation of Optic Disc Parameters Measured by Digital Retinal Photographs and Optical Coherence Tomography
Author Affiliations & Notes
  • C. Samarawickrama
    Centre for Vision Research, Department of Ophthalmology and Westmead Millennium Institute, University of Sydney, Sydney, Australia
  • S. C. Huynh
    Centre for Vision Research, Department of Ophthalmology and Westmead Millennium Institute, University of Sydney, Sydney, Australia
  • G. Burlutsky
    Centre for Vision Research, Department of Ophthalmology and Westmead Millennium Institute, University of Sydney, Sydney, Australia
  • J. B. Jonas
    Department of Ophthalmology, Faculty of Medicine Mannheim, University of Heidelburg, Mannheim, Germany
  • P. Mitchell
    Centre for Vision Research, Department of Ophthalmology and Westmead Millennium Institute, University of Sydney, Sydney, Australia
  • Sydney Childhood Eye Study
    Centre for Vision Research, Department of Ophthalmology and Westmead Millennium Institute, University of Sydney, Sydney, Australia
  • Sydney Myopia Study
    Centre for Vision Research, Department of Ophthalmology and Westmead Millennium Institute, University of Sydney, Sydney, Australia
  • Footnotes
    Commercial Relationships  C. Samarawickrama, None; S.C. Huynh, None; G. Burlutsky, None; J.B. Jonas, None; P. Mitchell, None.
  • Footnotes
    Support  Australian NHMRC Grant 253732
Investigative Ophthalmology & Visual Science May 2008, Vol.49, 636. doi:https://doi.org/
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      C. Samarawickrama, S. C. Huynh, G. Burlutsky, J. B. Jonas, P. Mitchell, Sydney Childhood Eye Study, Sydney Myopia Study; Correlation of Optic Disc Parameters Measured by Digital Retinal Photographs and Optical Coherence Tomography. Invest. Ophthalmol. Vis. Sci. 2008;49(13):636. doi: https://doi.org/.

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      © ARVO (1962-2015); The Authors (2016-present)

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Abstract

Purpose: : To compare measurements of optic disc parameters assessed from digital photographic images and from optical coherence tomography (OCT) in normal children.

Methods: : The Sydney Childhood Eye Study assessed 1740 6-year old children from 34 randomly selected primary schools during 2003-5. Digital retinal images were acquired using a Canon fundus camera (CF-60Uvi)/ EOS 10D. Optic disc parameters were measured from these digital images using the Image J program. Optic disc parameters were acquired from OCT3 (Stratus) images using the "fast" optic disc protocol. To date, retinal images of 320 children have been graded by both methods and are included in the analyses. Optic disc and cup area, vertical and horizontal disc and cup diameters as well as cup/disc ratios were calculated using both modalities. The magnification by the optic media was corrected using appropriate formulae.

Results: : The mean vertical and horizontal disc and cup diameters and the mean disc and cup areas as measured by OCT (1.76, 1.50, 0.71 and 0.68mm and 2.15 and 0.47mm2, respectively) were significantly (P<0.0001) lower than those measured by digital fundus photography (1.89, 1.70, 0.77 and 0.76mm and 2.51 and 0.53mm2, respectively). The vertical and horizontal cup/disc diameter ratios and the cup/disc area ratio did not vary significantly (P>0.05) between the 2 methods (0.41, 0.45 and 0.22 versus 0.41, 0.44 and 0.21, respectively). All parameters were strongly correlated for both modalities (r≥0.50, p<0.0001) with the exception of vertical disc diameter, which was least correlated (r=0.20, p=0.0003) followed by horizontal disc diameter (r=0.38, p<0.0001).

Conclusions: : Linear optic disc measurements of children are about 10% smaller when measured using OCT than by planimetry of fundus photographs, depending on the methods used for correcting the magnification of fundus images by the optic media. Since the ratios of measurements such as the cup/disc ratio did not differ between both methods, the differences in primary measurements between them may be mainly due to differences in correction of the magnification rather than differences in the definition and outlining of the disc structures.

Keywords: optic disc • imaging/image analysis: clinical • clinical (human) or epidemiologic studies: systems/equipment/techniques 
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