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A Surgical Approach for Optic Nerve Crush in a Rabbit Model

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Published on: July 8, 2025

Pathologic changes in chronic intraorbital optic nerve damage in rabbits.

Jiping Cai¹, Jinwei Cheng, Xiao Huang

¹Department of Ophthalmology, Shanghai Changzheng Hospital, Second Military Medical University, Shanghai 200003, PR China.

|February 24, 2009

Summary

This study successfully modeled chronic intraorbital optic nerve compression in rabbits, revealing progressive retinal ganglion cell loss and optic nerve damage with extended compression. Biomarker expressions like CNTF and GAP-43 increased, indicating a response to injury.

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Area of Science:

Ophthalmology
Neuroscience
Pathology

Background:

Chronic compression of the intraorbital optic nerve can lead to significant visual impairment.
Understanding the pathological changes is crucial for developing therapeutic strategies.

Purpose of the Study:

To establish a rabbit model of chronic intraorbital optic nerve compression.
To investigate the resulting pathological changes in the retina and optic nerve.

Main Methods:

A chronic compression model was created using a balloon implanted in the rabbit orbit.
Evaluations included funduscopy, visual electrophysiology (FVEP), histopathology, and immunohistochemistry.
Changes in retinal ganglion cells (RGCs), neuroglial cells, CNTF, and GAP-43 were assessed at 2, 4, and 8 weeks.

Main Results:

Compression led to optic disk congestion, edema, and paleness over time.
Flash visual evoked potential (FVEP) showed prolonged latency and reduced amplitude with increasing compression.
Histopathology revealed RGC loss, optic nerve fiber derangement, and increased neuroglial cells, alongside elevated GFAP expression.
Apoptosis in RGCs increased with compression duration, and CNTF/GAP-43 expression significantly upregulated.

Conclusions:

The rabbit model effectively replicates chronic intraorbital optic nerve compression.
Progressive RGC loss and optic nerve structural damage occur with sustained compression.
Neuroglial cell numbers initially decrease then increase, while CNTF and GAP-43 expression rises post-injury.