MMP-2 and MMP-9 activity in tears.

Activity of proMMP-2, proMMP-9 and MMP-9 in tears from wounded and procedural control eyes at different phases of epithelial healing. 1Optical Density (OD) multiplied by the number of gel pixels. *significantly greater MMP activity when compared to before wounding/procedure (p<0.001). †significantly greater proMMP-9 activity in wounded eyes as compared to procedural control eyes (p<0.04).