Tip of the Month
Publishing date: December 2016
Tip Editors: John Salmon and Gordana Sunaric Mégevand
Tip reviewer: Roger Hitchings
The Science behind the Tip
Most patients with neovascular glaucoma have retinal ischaemia secondary to either proliferative diabetic retinopathy, ischaemic central retinal vein occlusion or carotid vessel disease. The life expectancy of patients undergoing implantation surgery for this condition has been reported to be approximately 6.5 years (52%) less than expected life span Good presenting visual acuity appears to be a significant predictor of increased life expectancy (1). In those with a preoperative visual acuity of better than 6/48, 2.4 years of life expectancy is lost, compared to 10.8 years in those with an acuity less than 6/60 (1). Other studies have revealed a mortality rate of 15% -22% at 2 years after tube insertion (2,3).
By managing these patients in conjunction with a general physician and by controlling systemic disease, the risk to the fellow eye can be reduced and life expectancy should be increased.
Contributor: J F Salmon MD Consultant Ophthalmologist - Oxford Eye Hospital (UK)
1) Life expectancy of patients with neovascular glaucoma drained by Molteno implants. Blanc JP, Molteno ACB, Fuller JR et al Clin Exp Ophthamol 2004; 32: 360-3
2) Molteno tube implantation for neovascular glaucoma. Mermoud A, Salmon JF, Alexander PA, et al., A ophthalmology 1993; 100- 897-902.
3) Filtering valve surgery for neovascular glaucoma. Krupin T, Kaufman P, Mandell A et al Am J Ophthalmol 1980: 89:338-43