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Unilateral optic disc edema following trabeculectomy
1Midwest Eye Institute, Clarian Hospitals of Indiana, Indianapolis, USA.
Summary
Two cases of optic disc edema occurred after successful trabeculectomy surgery. This benign condition may result from altered pressure dynamics at the lamina cribrosa.
Area of Science:
- Ophthalmology
- Neurosurgery
Background:
- Trabeculectomy is a common surgical procedure to reduce intraocular pressure (IOP) in glaucoma patients.
- Optic disc edema, swelling of the optic nerve head, can have various causes, including elevated intracranial pressure (ICP) or hypotony.
Observation:
- Two patients developed optic disc edema 2-4 weeks post-trabeculectomy.
- This edema was benign, with no associated visual acuity or visual field loss.
- Neither patient had hypotony or pseudotumor cerebri; however, both exhibited high-normal intracranial pressure.
Findings:
- The optic disc edema was not caused by typical hypotony or elevated intracranial pressure.
- A decrease in IOP post-trabeculectomy may have shifted the ICP:IOP ratio.
- This altered pressure ratio at the lamina cribrosa is hypothesized to be the cause of the optic disc edema.
Implications:
- This suggests a novel mechanism for optic disc edema following glaucoma surgery.
- Clinicians should consider the ICP:IOP ratio in the differential diagnosis of optic disc edema post-trabeculectomy.
- Further research is needed to confirm this pressure-related etiology.