UGH syndrome, standing for uveitis-glaucoma-hyphema syndrome, is a delayed complication of intraocular lens implantation in which mechanical irritation from a malpositioned or poorly sited lens produces the triad the name describes.
It is a classic teaching example of how a mechanical problem, chronic contact between an implant and adjacent uveal tissue, can produce a combination of inflammatory, hemorrhagic, and pressure findings that might otherwise be investigated as three separate, unrelated problems.
Recognizing the triad as a single mechanical process, rather than chasing uveitis, glaucoma, and hyphema independently, is what actually leads to the correct diagnosis and treatment.
UGH syndrome has become less common as lens design and surgical technique have improved, but it has not disappeared entirely, and the underlying principle applies just as directly to any modern lens that ends up malpositioned.
Mechanism
Chronic mechanical chafing occurs when an intraocular lens, most classically an anterior chamber lens or a posterior chamber lens with a haptic malpositioned in the sulcus, repeatedly contacts the iris, ciliary body, or angle structures with eye movement and pupillary changes.
This repetitive contact causes low-grade inflammation, presenting as anterior chamber cell and flare, along with intermittent microhemorrhage from irritated iris or ciliary body vessels, seen clinically as recurrent or persistent hyphema or microhyphema.
Elevated intraocular pressure follows from a combination of inflammatory debris, red blood cells, and pigment obstructing trabecular outflow, compounding the direct mechanical component in some cases where the lens is also physically crowding the angle.
Risk Factors
- Anterior chamber intraocular lenses, historically more associated with UGH syndrome than posterior chamber lenses, given their direct proximity to angle structures
- Sulcus-placed posterior chamber lenses not specifically designed for sulcus fixation, where a haptic can erode against the posterior iris surface over time
- Lens malposition or decentration from any cause, increasing focal contact with adjacent uveal tissue at a specific point
- A history of complicated cataract surgery, including capsular rupture, which increases the likelihood of lens malposition in the first place
A single-piece acrylic lens placed inadvertently in the sulcus, rather than the specific three-piece designs meant for sulcus fixation, is a particularly well-recognized modern-era cause, since the stiffer, flatter haptics of single-piece designs are more prone to chronic posterior iris chafing.
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From Choroida — the team behind this siteClinical Presentation
Symptoms and findings typically develop months to years after the original cataract or lens implantation surgery, distinguishing UGH syndrome from the more immediate postoperative inflammation and pressure elevation that can occur in the early recovery period.
Patients may report intermittent blurred vision, floaters from recurrent microhemorrhage, or eye pain, sometimes accompanied by visibly recurrent hyphema noticeable even without a slit lamp.
Exam findings include anterior chamber cell and flare, transillumination defects in the iris corresponding to points of chronic lens contact, and elevated intraocular pressure that can range from mild to severe depending on how much outflow obstruction has accumulated.
Diagnostic Evaluation
Careful slit-lamp examination with retroillumination is often the most useful single step, since it can reveal iris transillumination defects that directly localize the point of chronic mechanical contact with the lens.
Gonioscopy assesses the lens position relative to the angle and can reveal a malpositioned haptic directly, while ultrasound biomicroscopy offers a more detailed view of the ciliary sulcus and lens-iris relationship when the diagnosis remains uncertain on exam alone.
Careful review of the original operative report, when available, can clarify what type of lens was implanted and whether any intraoperative complication might explain a subsequently malpositioned implant.
Management
Medical management with topical corticosteroids for inflammation and aqueous suppressants for pressure control can control symptoms temporarily, but it does not address the underlying mechanical cause and recurrence is common once therapy is tapered.
Definitive treatment usually requires surgical repositioning, exchange, or removal of the offending lens, addressing the mechanical irritation at its actual source rather than continuing to treat its downstream inflammatory and hemorrhagic consequences indefinitely.
Careful preoperative planning for the lens exchange, including anticipating capsular support and choosing an appropriate replacement lens type and fixation method, matters considerably for preventing recurrence of the same problem with a new implant.
Because the diagnosis is easy to overlook years after the original surgery, when the patient may no longer connect their new symptoms to an old cataract operation, taking a lens implant history seriously in any unexplained recurrent hyphema or glaucoma is well worth the effort.
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From Choroida — the team behind this siteReferences
- Ellingson FT. The uveitis-glaucoma-hyphema syndrome associated with the Mark VIII anterior chamber lens implant. Journal of the American Intra-Ocular Implant Society.
- American Academy of Ophthalmology. Basic and Clinical Science Course, Section 11: Lens and Cataract.
- Piette S, Canlas OA, Tran HV, et al. Ultrasound biomicroscopy in uveitis-glaucoma-hyphema syndrome. American Journal of Ophthalmology.
