May 2004
Volume 45, Issue 13
ARVO Annual Meeting Abstract  |   May 2004
Determination of true optic disc area using a fundus camera technique: correlation with HRT measurements
Author Affiliations & Notes
  • M.G. Quigley
    Department of Ophthalmology, McGill Univ/Univ of Montreal, Montreal, PQ, Canada
  • V.R. Patel
    Department of Ophthalmology, McGill Univ, Montreal, PQ, Canada
  • P. Harasymowycz
    Department of Ophthalmology, Univ of Montreal, Montreal, PQ, Canada
  • Footnotes
    Commercial Relationships  M.G. Quigley, None; V.R. Patel, None; P. Harasymowycz, None.
  • Footnotes
    Support  none
Investigative Ophthalmology & Visual Science May 2004, Vol.45, 3344. doi:
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      M.G. Quigley, V.R. Patel, P. Harasymowycz; Determination of true optic disc area using a fundus camera technique: correlation with HRT measurements . Invest. Ophthalmol. Vis. Sci. 2004;45(13):3344.

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

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Abstract: : Purpose: To compare disc areas as measured with Heidelberg Retinal Tomography (HRT) to those obtained with a fundus camera technique. Methods: Forty six subjects ( 88 eyes) who were participating in a glaucoma screening program were enrolled in the study. Disc areas from fundus photographs taken with a Nidek non–mydriatic camera were measured in pixels (Adobe photoshop 7.0). A magnification factor was determined using a previously described technique which uses the position of the focusing knob on the camera to account for the refractive error (Arch Ophthalmol. 2003;121:707–709). The resulting calculated disc areas were then compared with HRT measurements of the same discs. Results: A regression analysis revealed a strong correlation ( r=0.83) between disc areas as measured with HRT and those calculated using the fundus camera technique referred to above. Conclusions: Disc areas can be accurately determined using this simple fundus photographic technique. This may have significant implications for population–based mass glaucoma screening programs.

Keywords: imaging/image analysis: clinical • optic disc 

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