The first 10 subjects in Phase 1 will all be treated with single-fiber catheters, but with one of two different vacuum levels (intermittent at -50 mmHg or constant at -150 mmHg). After the first 10 subjects have completed the study, fluid removal results will be analyzed. If results demonstrate that fluid in the anterior compartment is being withdrawn at a rate of ≥ 0.5 mls/24 hours, the second group of 10 subjects will continue using the same single fiber catheters. If the results of the first 10 subjects demonstrate fluid is being withdrawn in the anterior compartment at < 0.5 mls/24 hours, the next 10 subjects will instead receive treatment with two multi-fiber FC catheters plus the same PMFC catheter.