Point of Care Testing of Inflammatory Markers in Tears

To evaluate the use of a point of care device to measure markers of inflammation in various eye conditions. In particular, matrix metalloproteinase-9 (MMP-9) will be measured. MMP-9 is an enzyme that plays a role in inflammation. The value obtained with the point of care device will be correlated with values obtained using gel electrophoresis to measure MMP-9 from the same sample. These data will be compared to clinical exam findings and questionnaires to help the investigators better understand the role of this marker of inflammation in eye diseases and possibly improve diagnostic abilities.