May 2008
Volume 49, Issue 13
Free
ARVO Annual Meeting Abstract  |   May 2008
Is It Necessary to Have Optic Disc Photos to Measure Optic Disc Parameters From the Heidelberg Retinal Tomograph?
Author Affiliations & Notes
  • S. Loon
    Ophthalmology, National University Hospital, Singapore, Singapore
    Ophthalmology, Westmead Public Eye Hospital, Sydney, Australia
  • L. Tong
    Ophthalmology, Singapore National Eye Centre, Singapore, Singapore
  • G. Gazzard
    Ophthalmology, Moorfields Eye Hospital, London, United Kingdom
  • Y. Chan
    Ophthalmology, National University of Singapore, Singapore, Singapore
  • E. L. Sim
    Ophthalmology, National University of Singapore, Singapore, Singapore
  • T. Aung
    Ophthalmology, Singapore National Eye Centre, Singapore, Singapore
  • D. H. Tan
    Ophthalmology, Singapore National Eye Centre, Singapore, Singapore
    Singapore Eye Research Institute, Singapore, Singapore
  • P. R. Healey
    Ophthalmology, Westmead Public Eye Hospital, Sydney, Australia
  • T. Y. Wong
    Singapore Eye Research Institute, Singapore, Singapore
    Ophthalmology, Centre for Eye Research Australia, University of Melbourne, Australia
  • S. M. Saw
    Singapore Eye Research Institute, Singapore, Singapore
    Department of Community, Occupational and Family Medicine, National University Hospital, Yong Loo Lin School of Medicine, Singapore
  • Footnotes
    Commercial Relationships  S. Loon, None; L. Tong, None; G. Gazzard, None; Y. Chan, None; E.L. Sim, None; T. Aung, None; D.H. Tan, None; P.R. Healey, None; T.Y. Wong, None; S.M. Saw, None.
  • Footnotes
    Support  NMRC/0695/2002
Investigative Ophthalmology & Visual Science May 2008, Vol.49, 3597. doi:https://doi.org/
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      S. Loon, L. Tong, G. Gazzard, Y. Chan, E. L. Sim, T. Aung, D. H. Tan, P. R. Healey, T. Y. Wong, S. M. Saw; Is It Necessary to Have Optic Disc Photos to Measure Optic Disc Parameters From the Heidelberg Retinal Tomograph?. Invest. Ophthalmol. Vis. Sci. 2008;49(13):3597. doi: https://doi.org/.

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

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Abstract

Purpose: : We aim to evaluate the measurement of optic disc morphology using the Heidelberg Retinal Tomography (HRT) with and without the aid of optic disc photos.

Methods: : 103 children (aged 11 and 12 years, 52 boys) were selected randomly from the Singapore Cohort study of Risk Factors for Myopia (SCORM). Optic nerve head topography and retinal nerve fiber layer (RNFL) thickness measurements were assessed using the HRT-II (Heidelberg, Germany) scanning laser ophthalmoscope with correction for refractive errors. All contour lines were drawn by the same researcher on two occasions. The first drawing was done without the aid of optics disc photographs. The second drawing, done two days later, was made with the aid of the 3-dimensional rotation assessment and digital monoscopic optic disc photographs.

Results: : There was a high correlation between measurements made without and with optic disc photographs. For global disc area readings, difference between the mean readings was 0.67 mm2 and the intraclass correlation (ICC) was 0.81 (95% CI 0.73 to 0.86). The mean difference in readings for global cup to disc ratio was 0.03 and ICC was 0.86 (95% CI 0.80 to 0.90). The ICCs were high across almost all of the readings except rim volume, where the ICC was 0.57 (95% CI 0.43 to 0.69).

Conclusions: : This study shows minimal differences in HRT measured optic disc parameters when optic disc photos are used to aid in the definition of the scleral ring. Omitting the use of disc photographs in measuring HRT outputs may translate into significant savings in time and logistics in simultaneously obtaining HRT and optic disc photographs in large population based studies.

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