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Glaucoma: Overview

Glaucoma: Overview

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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Updated: May 13, 2025

Full-Circle Cauterization of Limbal Vascular Plexus for Surgically Induced Glaucoma in Rodents

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Association Between Cup-to-Disc Ratio and Structural and Functional Damage Parameters in Glaucoma: Insights From

Aliah McCalla^1,2, Mengyu Wang¹, Mohammad Eslami¹

¹Schepens Eye Research Institute of Mass Eye and Ear, Harvard Medical School, Boston, Massachusetts, USA.

Translational Vision Science & Technology

|April 16, 2025

Summary

The vertical cup-to-disc ratio (CDR) shows ceiling effects for glaucoma outcomes, limiting its ability to detect early damage. Interpret CDR values cautiously, especially in glaucoma screening settings.

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Area of Science:

Ophthalmology
Glaucoma Diagnostics
Medical Imaging

Background:

The vertical cup-to-disc ratio (CDR) is a key metric in glaucoma assessment.
Understanding the limitations of CDR in diagnosing glaucoma is crucial for accurate patient management.

Purpose of the Study:

To model the association between vertical cup-to-disc ratio (CDR) and clinically relevant glaucomatous outcomes.
To investigate the ceiling effects of CDR in glaucoma diagnostics.

Main Methods:

Sigmoidal regression models were developed using clinician-estimated CDR and optical coherence tomography (OCT)-derived CDR.
Data included circumpapillary retinal nerve layer thickness, optic disc diameter, and visual field parameters (mean deviation, glaucoma hemifield test, visual field index).
Model comparisons utilized logarithms of Bayes factors (logBF) to assess evidence for sigmoidal versus linear regression and identify floor/ceiling effects.

Main Results:

Sigmoidal regression provided strong evidence over linear regression for all outcomes (logBF > 650).
CDR exhibited plateauing toward 0 and ceiling effects for functional outcomes, indicating limitations in detecting early glaucomatous damage.
Clinician-estimated CDR showed a stronger association with functional outcomes, while OCT-derived CDR correlated better with retinal nerve fiber layer thickness.

Conclusions:

The vertical cup-to-disc ratio (CDR) is subject to ceiling effects, limiting its sensitivity for early glaucoma detection.
CDR values require careful interpretation, particularly in screening scenarios, due to these limitations.
Nonlinear modeling enhances understanding of CDR's impact and constraints in glaucoma diagnostics.