Painful, Red Eye
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A patient with previously diagnosed diabetes presents to the ophthalmologist’s office with eye pain and red eye.
Diagnosis
This patient has rubeosis and neovascular glaucoma (NVG) resulting from diabetes and ocular ischemic syndrome (90% stenosis on carotid ultrasound). The photo on the back cover shows extensive rubeosis, ectropion uveae along the temporal pupillary border and broad peripheral anterior synechia nasally.
Early iris and angle neovascularization is often associated with a normal IOP. Once a fibrovascular membrane forms ectropion uveae, anterior synechia and angle closure can develop with a rapid rise in IOP. The membrane can be difficult to visualize; in early stages, the IOP can be elevated with an angle that appears to be open.
Management
Treatment of underlying systemic conditions, such as carotid occlusive disease; panretinal photocoagulation (PRP) for retinal ischemia; aqueous suppressants to control IOP; topical steroids for any inflammatory component; and surgery, preferably filtering surgery or aqueous shunts before cyclodestructive procedures, if useful vision is possible.
A. Limbus: closed angle and anterior synechiae.
B. Mid-peripheral iris: partial synechiae and rubeosis.
Source: Odette Callender, MD
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Vascular endothelial growth factor (VEGF) has been implicated as an important factor in the pathogenesis of intraocular neovascularization. Intravitreal anti-VEGF agents may temporarily suppress iris and angle neovascularization allowing PRP to be performed and to take effect.
Caveat: NVG can occur without retinal or disc neovascularization. Frequent monitoring, including gonioscopy, is warranted for those at risk.
References
- Hayreh SS. Neovascular Glaucoma. Prog Retin Eye Res. 2007;26: 470–485.
- Neovascular Glaucoma. American Academy of Ophthalmology Web site. http://eyewiki.aao.org/Neovascular_Glaucoma#Signs. Accessed July 21, 2011.