Iridocorneal Endothelial Syndrome is a disease in which the cornea’s innermost cells forget their boundaries.
The corneal endothelium proliferates and creeps across the angle and onto the iris, dragging it out of shape and sealing the drainage angle shut.
The result is a strikingly distorted iris, a swollen cornea, and a stubborn secondary glaucoma, almost always in one eye of a middle-aged woman.
For clinicians, recognizing Iridocorneal Endothelial Syndrome (ICE) matters because it is a unilateral, progressive cause of glaucoma and corneal decompensation that behaves quite differently from ordinary open-angle disease.
An asymmetric iris, a hammered-silver endothelium, and a high pressure in one eye are the clues that bring it to mind.
What Is Iridocorneal Endothelial Syndrome?
ICE syndrome is a spectrum of disorders in which an abnormal corneal endothelium migrates across the anterior chamber angle and iris surface.
It is traditionally divided into three overlapping variants:
- Chandler syndrome — dominated by a beaten-metal endothelium and corneal oedema
- Essential (progressive) iris atrophy — dominated by iris thinning, holes, and displacement
- Cogan-Reese syndrome — dominated by pigmented pedunculated iris nodules
All three share the same underlying problem: a membrane of abnormal endothelial cells that contracts over the angle and iris.
Epidemiology and Cause
The demographic pattern is fairly consistent.
- Typically affects middle-aged adults, more often women
- Almost always unilateral and non-familial
- A viral trigger, particularly herpes simplex, has been implicated in the abnormal endothelium
The unilateral, sporadic nature helps separate ICE from the inherited endothelial dystrophies.
Clinical Presentation
Symptoms
- Blurred vision from corneal oedema, often worse in the morning
- A change in the appearance of the pupil or iris, sometimes noticed by the patient
- Symptoms of raised pressure when glaucoma is advanced
Examination Findings
- A beaten-bronze or hammered-silver endothelium on the affected cornea
- Corneal oedema, especially in the Chandler variant
- Iris changes — corectopia, polycoria, atrophy, and pedunculated nodules
- Broad peripheral anterior synechiae that close the angle on gonioscopy
A distorted, off-centre pupil with peripheral anterior synechiae in one eye is highly suggestive of ICE.
Diagnostic Evaluation
Endothelial imaging and gonioscopy confirm the diagnosis.
- Specular or confocal microscopy shows characteristic abnormal endothelial cells, the so-called ICE cells
- Gonioscopy demonstrates peripheral anterior synechiae and angle closure
- Slit-lamp examination documents the corneal and iris changes
- Intraocular pressure and optic nerve assessment stage the glaucoma
The abnormal endothelium seen on specular microscopy is the finding that anchors the diagnosis.
Differential Diagnosis
A few conditions produce overlapping features:
- Posterior polymorphous corneal dystrophy — bilateral and inherited
- Fuchs endothelial dystrophy — bilateral, without iris distortion or synechiae
- Axenfeld-Rieger syndrome — bilateral, congenital, and often familial
- Posterior polymorphous and iridocorneal overlap can be resolved with laterality and specular microscopy
Unilaterality, acquired onset, and the ICE cells distinguish it from these bilateral, inherited conditions.
Management
Treatment targets the two threats: pressure and cornea.
- Glaucoma is managed medically first, but often progresses to surgery; glaucoma drainage devices tend to outperform trabeculectomy because the membrane can occlude a trabeculectomy
- Corneal decompensation may require endothelial or penetrating keratoplasty
- Laser trabeculoplasty is generally ineffective because the angle is covered by membrane
Because the abnormal endothelium keeps advancing, management is about controlling its consequences rather than curing it.
Prognosis
The course is slowly progressive.
- Glaucoma can be difficult to control and is the main threat to vision
- Corneal decompensation may develop over time
- Early, structured management preserves useful vision in most eyes
In practice, the value of recognising ICE is anticipating its glaucoma and corneal complications rather than being surprised by them.
Would you like to document corneal and iris findings with your smartphone?
Smartphone slit-lamp photography makes it easy to capture the hammered endothelium, iris distortion, and pupil changes and to track their progression using a simple slit-lamp adaptor.
SLIT-LAMP SMARTPHONE PHOTOGRAPHY
References
- Shields MB. “Progressive Essential Iris Atrophy, Chandler’s Syndrome, and the Iris Nevus (Cogan-Reese) Syndrome: A Spectrum of Disease.” Survey of Ophthalmology. 1979;24(1):3–20.
- Sacchetti M, Mantelli F, Marenco M, et al. “Diagnosis and Management of Iridocorneal Endothelial Syndrome.” BioMed Research International. 2015;2015:763093.
- Alvarado JA, Underwood JL, Green WR, et al. “Detection of Herpes Simplex Viral DNA in the Iridocorneal Endothelial Syndrome.” Archives of Ophthalmology. 1994;112(12):1601–1609.
- American Academy of Ophthalmology. “Iridocorneal Endothelial Syndrome.” EyeWiki.
