The primary aim of the study is to investigate whether optical coherence tomography (OCT) may be a useful tool for investigating the in-vivo histology of ocular structures in patients with tear film pathology. In epiphora the investigators will image the proximal lacrimal system. In dry eye syndrome the investigators will image the lacrimal gland and also the buccal mucosa. The secondary aim of the study is to investigate the appearance of the normal cornea and conjunctiva under OCT imaging.
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Qualitative difference in OCT appearance of lacrimal and buccal glands measured at a single time-point, between dry eye patients and asymptomatic patients
Timeframe: Baseline, at the time of listing for surgery
Comparison of punctual diameter, canalicular diameter and canalicular depth between asymptomatic patients and patients with epiphora pre-operatively and post-operatively, and correlation with Lac-Q questionnaire score
Timeframe: 26 weeks