View clinical trials related to Tear Film Insufficiency.
Filter by:2017 International Dry Eye Workshop (DEWS) defines dry eye as a multifactorial ocular surface disease characterized by tear film instability with disturbed visual function. As a smooth transparent structure and the outmost layer of the whole ocular refractive system, tear film plays an important role. In dry eye, the instability of tear film caused by a lack of tear volume or high evaporation makes it more vulnerable to break up during blinking intervals, exposing the rough epithelium of the corneal surface and introducing extra aberrations and scatter. This would affect image sharpness on the retina and lower the optical quality. Also, it had been observed that the dynamic tear film scattering was reduced and the objective optical quality was improved transiently after artificial tears instillation. Though these findings supported the fact of visual quality impairment in dry eye. It remains unclear how does the tear film instability affect the visual quality in specific. Whether it lowers the optical quality of the whole ocular or just affects the tear-film associated part alone and whether there is a correlation with the tear film function are still unknown and to be answered. So we wondered whether there is a correlation between the tear film function and the related optical quality in dry eye. Though it had been inspected that the invasive tear break up time by fluorescein staining was positively correlated with the related scattering of tear film. To the newest dry eye diagnosis criteria of 2017 DEWS, the non-invasive tear break-up time has been amended to the first line instead of the invasive methods, e.g. fluorescein staining, which was thought to be less accurate and less credible. What's more, the invasive method of tear film evaluation might introduce confounding factors to the successive optical quality assessment. So we need a more accurate investigation to the relationships of the tear film function and the optical quality in dry eye. This study was intended to measure the non-invasive tear break-up time and the objective optical quality in normal people and dry eye patients to illustrate this question. In addition, we will investigate the relation of evolution trends of NIKBUT and objective optical quality under artificial tears for a better illustration.
The DRy eye Outcome and Prescription Study (DROPS) is a large observational multicentre study exploring the 'real world' effectiveness of artificial tears in dry eye disease and determinants of efficacy. The aim is to include at least 635 symptomatic dry eye patients who are prescribed artificial tears. All trainees and fellows in London are invited to become collaborators: collaborators are asked to consent patients, assess signs at baseline, and give patients questionnaires at baseline and 4 weeks (for home completion). In tandem, we are conducting a qualitative review of ophthalmologists' prescribing behaviours for dry eye disease.