Neuro-Ophthalmological Optic Nerve Cupping: An Overview

Area of Science:

• Ophthalmology
• Neuro-ophthalmology

Background:

• Optic nerve cupping (enlarged cup-to-disc ratio) is a hallmark of glaucoma.
• However, similar optic nerve appearance can result from various non-glaucomatous optic neuropathies.
• Distinguishing between glaucomatous and non-glaucomatous cupping is clinically challenging.

Purpose of the Study:

• To review known non-glaucomatous causes of optic nerve cupping.
• To outline a systematic approach for evaluating patients presenting with an enlarged cup-to-disc ratio.

Main Methods:

• Literature review of non-glaucomatous optic neuropathies causing cupping.
• Discussion of clinical examination findings and ancillary tests.

Main Results:

• Non-glaucomatous cupping can arise from compressive, ischemic, hereditary, and inflammatory optic neuropathies.
• Cupping involves prelaminar (retinal ganglion cell loss) and laminar (lamina cribrosa damage) components.
• Key differentiating features include neuroretinal rim pallor, but a holistic patient assessment is crucial.

Conclusions:

• Accurate diagnosis requires integrating patient history, visual function, ocular examination, and ancillary tests like OCT.
• A structured diagnostic approach aids in differentiating glaucomatous from non-glaucomatous causes of optic disc cupping.