- Sitting IOP (see details below) Eligible patients will be required to stop taking (wash-out) their glaucoma eye-drops medications in both eyes until their IOP level is increased by at least 3 mmHg from start of washout in both eyes Visit 2: Screening & EXP-LP plug insertion in one eye and Xalatan © eye-drops in the second eye, (2 weeks or 4 weeks after beginning washout, visit 2a or 2b accordingly) The below mentioned 3 mmHg increase (inclusion criteria #4) is examined at visit 2a (two weeks after first screening visit) for safety reasons, to ensure the patient "untreated IOP" will be monitored (<31 mmHg for glaucoma patients or < 33 mmHg for ocular hypertension patients).