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Glaucoma is an eye condition characterized by increased intraocular pressure that damages the retina and optic nerve, leading to irreversible blindness if left untreated. The human eye has various components, including the cornea, iris, pupil, lens, and optic nerve. Aqueous humor is secreted by the epithelium of the ciliary body in the posterior chamber and flows through the trabecular meshwork and canal of Schlemm, maintaining normal intraocular pressure. The trabecular meshwork and the canal...
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Decoding glaucoma module premium edition.

Prasanna Venkatesh Ramesh1, Sathyan Parthasarathi2, Shruthy Vaishali Ramesh1

  • 1Mahathma Eye Hospital Private Limited, Trichy, Tamil Nadu, India.

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|June 1, 2022
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Summary
This summary is machine-generated.

Bruch's Membrane Opening-Minimum Rim Width (BMO-MRW) offers a more precise method for glaucoma evaluation than traditional BMO-HRW. This new parameter, used with Spectralis OCT

Keywords:
Anatomic Positioning SystemBMO-HRWBMO-MRWGMPEOCTSpectralis

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Area of Science:

  • Ophthalmology
  • Medical Imaging
  • Glaucoma Research

Background:

  • Traditional neuroretinal rim width measurement in SD-OCT uses Bruch's Membrane Opening-Horizontal Rim Width (BMO-HRW), referencing the BMO to a horizontal plane.
  • BMO-HRW measures the distance between the BMO and ILM along the horizontal plane.
  • Spectralis OCT's Glaucoma Module Premium Edition (GMPE) introduces Bruch's Membrane Opening-Minimum Rim Width (BMO-MRW), measuring the minimum distance between BMO and ILM.

Purpose of the Study:

  • To explain the anatomy of the optic nerve head (ONH) and GMPE from a novice perspective.
  • To elucidate why BMO-MRW is more critical than BMO-HRW for accurate glaucoma assessment.

Main Methods:

  • Utilizing 2D & 3D animations to depict GMPE concepts, including ONH anatomy, Bruch's Membrane (BM), and BMO.
  • Comparing BMO-MRW with BMO-HRW, and illustrating ONH zones (Alpha, Beta, Gamma) in OCT.
  • Demonstrating the Anatomic Positioning System (APS) and its impact on the Fovea-BMO-Center (FoBMOC) axis.

Main Results:

  • The APS enables scan alignment to the individual's FoBMOC axis for precise follow-up.
  • Accurate detection of minute changes (as small as 1 micron) in BMO-MRW is achievable.
  • This precision in BMO-MRW measurement signifies a new era in glaucoma diagnosis and progression monitoring.

Conclusions:

  • BMO-MRW provides a more objective and sensitive measure for glaucoma evaluation compared to BMO-HRW.
  • The integration of APS with GMPE enhances the precision of detecting glaucomatous changes.
  • This advancement facilitates earlier and more accurate diagnosis and management of glaucoma.