![]() Patients in both groups experienced a significant improvement in McMonnies Dry Eye Questionnaire score (P=<0.0001). Results: Patients who switched to BAK-free preparations reported a significant fall in the use of lubricants (P=<0.001). Main Outcome Measures: Intraocular pressure, tear-film breakup time, McMonnies Dry Eye Questionnaire score and reported lubricant use. Data were collected via an online survey completed by the ophthalmologist during three appointments over a 16- to 30-week period for all patients. At the ophthalmologist's discretion, some patients were switched to BAK-free anti-glaucoma products. Methods: Patients were screened for inclusion during a routine consultation. The cohort was predominantly female (68%) with an average age of 71 years. Participants: There were 375 patients enrolled, with a completion rate of 64%. Design: Prospective clinical audit from March 2012 to April 2013, open to ophthalmologists practising in Australia. The OBSERVE clinical audit was designed to track the impact of intraocular pressure lowering medications in patients with evidence of OSD to test the hypothesis that BAK-free anti-glaucoma preparations offer clinical advantages over BAK-containing products. OSD symptoms could be linked to prolonged exposure to preservatives in anti-glaucoma medications, especially benzalkonium chloride (BAK). Background: Ocular surface disease (OSD) is relatively common in glaucoma patients. ![]()
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