Spontaneous filtering bleb with subsequent secondary glaucoma June consultation #1

Area of Science:

• Ophthalmology
• Glaucoma Research
• Ocular Physiology

Background:

• A previously healthy 32-year-old woman presented with new-onset hypotony in her right eye.
• Her history included myopia and left eye idiopathic Horner syndrome, with 6 months of fluctuating vision loss in the affected eye.
• Initial examination revealed low intraocular pressure (IOP) of 4 mm Hg, scleral thinning, optic disc edema, and chorioretinal folds.

Purpose of the Study:

• To describe the clinical course and management challenges of a rare case of hypotony progressing to intractable ocular hypertension.
• To discuss the differential diagnosis of spontaneous perilimbal filtration blebs and associated scleral thinning.
• To evaluate potential systemic workups for unexplained scleral thinning and surgical strategies for secondary glaucoma.

Main Methods:

• Case report detailing clinical presentation, diagnostic workup including optical coherence tomography (OCT) and ultrasound biomicroscopy.
• Documentation of disease progression, including development of peripheral anterior synechiae (PAS) and subsequent IOP elevation.
• Review of management strategies, including medical therapy and consideration of surgical intervention.

Main Results:

• The patient's hypotony evolved into significantly elevated IOP (up to 55 mm Hg) due to PAS formation at the site of scleral thinning.
• Maximal medical therapy failed to control the IOP, leading to optic neuropathy and visual field defects.
• The case highlights the complex interplay between spontaneous filtration blebs, scleral abnormalities, and secondary glaucoma.

Conclusions:

• Spontaneous perilimbal filtration blebs can lead to hypotony and subsequent complications like PAS and intractable ocular hypertension.
• A thorough differential diagnosis for scleral thinning and a systematic approach to managing secondary glaucoma are crucial.
• Further investigation into the etiology of spontaneous scleral thinning may be warranted in select cases.