Ahmed and Baerveldt tube shunts are devices used to treat difficult glaucoma by diverting fluid to a plate on the eye surface. Understanding their differences helps when discussing surgery.
Design and early pressure control
Both implants include a fine tube into the eye and a plate where fluid collects. Their valve features influence how pressure behaves after surgery.
- Ahmed valves contain a built-in mechanism to limit early over-drainage
- Baerveldt implants are non-valved and usually tied off initially
- Pressure may fall more gradually with Baerveldt once the ligature dissolves
- Choice considers target pressure and risk of pressure dropping too low
Long-term outcomes and considerations
Both devices can control pressure when other options have failed. The best choice varies between individuals.
- Baerveldt shunts may achieve lower final pressures in some studies
- Ahmed valves can be helpful in eyes at higher risk of complications
- Regular follow-up manages bleb health, tube position, and drop use
- Discuss lifestyle, other eye diseases, and previous surgeries with your surgeon
