Digital Ocular Compressions Reduce Intraocular Pressure in Eyes With Tube Shunts

Area of Science:

• Ophthalmology
• Glaucoma Management
• Surgical Interventions

Background:

• Digital ocular compressions (DOCs) are used to reduce intraocular pressure (IOP) postoperatively.
• Limited data exists on DOC efficacy in eyes with existing glaucoma tube shunts.

Purpose of the Study:

• To investigate the effects of DOC on IOP in eyes with long-established, functional glaucoma tube shunts.
• To compare IOP reduction magnitude and duration between tube shunt eyes and their non-surgical fellow eyes.

Main Methods:

• Prospective, masked study involving adult primary open-angle glaucoma patients with a single Ahmed tube shunt.
• Standardized transpalpebral DOC applied to each eye; IOP measured at intervals up to 240 minutes.
• Fellow eye served as a control; IOP reduction analyzed using Kaplan-Meier analysis.

Main Results:

• DOC resulted in a mean initial IOP reduction of 5.36 mm Hg in tube shunt eyes versus 2.55 mm Hg in control eyes (P=0.014).
• Log-rank analysis indicated a significantly longer duration of IOP reduction in the tube shunt group (P=0.049).
• No significant difference in applied impulse between the two groups (P=0.6).

Conclusions:

• Digital ocular compressions (DOCs) provide an effective, transient IOP reduction in eyes with established tube shunts.
• The IOP-lowering effect in tube shunt eyes is significantly greater in magnitude and duration compared to non-surgical eyes.
• Scheduled DOCs may be necessary to maintain the IOP-lowering effect over time.