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Linear discriminant score for differentiating early primary open angle glaucoma from glaucoma suspects.

Gunjan A Deshpande1, Prashant K Bawankule2, Dhananjay V Raje3

  • 1Department of Glaucoma, Sarakshi Netralaya, Nagpur, Maharashtra, India.

Indian Journal of Ophthalmology
|December 22, 2018
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Summary

A new linear discriminant function (LDF) accurately differentiates early primary open-angle glaucoma (POAG) from glaucoma suspects. This diagnostic tool, using macular ganglion cell complex (GCC) and optic nerve head (ONH) and retinal nerve fibre layer (RNFL) data, shows high accuracy.

Keywords:
Early glaucomaganglion cell complexlinear discriminant functionretinal nerve fibre layer

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Area of Science:

  • Ophthalmology
  • Medical Diagnostics
  • Glaucoma Research

Background:

  • Early detection of primary open-angle glaucoma (POAG) is crucial for preventing vision loss.
  • Glaucoma suspects require accurate differentiation from early POAG to guide management.
  • Macular ganglion cell complex (GCC), optic nerve head (ONH), and retinal nerve fibre layer (RNFL) are key indicators in glaucoma assessment.

Purpose of the Study:

  • To evaluate the diagnostic accuracy of a linear discriminant function (LDF) for distinguishing early POAG from glaucoma suspects.
  • To assess the LDF's performance using GCC, ONH, and RNFL parameters.
  • To compare the LDF's accuracy against individual parameter diagnostic capabilities.

Main Methods:

  • A cross-sectional study analyzed data from 127 glaucoma suspects and 74 early POAG eyes.
  • Ocular examination, standard automated perimetry, GCC, ONH, and RNFL analyses were performed.
  • Linear discriminant function (LDF) was calculated after statistical adjustments and multiple testing correction, with diagnostic accuracy evaluated on a separate test set.

Main Results:

  • Inferotemporal GCC parameters showed strong discriminating power.
  • Average RNFL thickness and vertical cup-to-disc ratio (CDR) were significant ONH and RNFL parameters.
  • The combined LDF achieved an area under the receiver operating characteristic curve (AUROC) of 0.924, with 84.31% accuracy in the test set.

Conclusions:

  • The developed LDF demonstrates superior diagnostic accuracy compared to individual GCC and ONH/RNFL parameters.
  • The LDF is a valuable tool for the accurate diagnosis of early glaucoma.
  • This approach aids in differentiating glaucoma suspects from those with early-stage POAG.