Tear fluid small molecular antioxidants profiling shows lowered glutathione in keratoconus.

Keratoconus (KC) is a non-inflammatory disease of the cornea involving structural changes. Oxidative stress is reported to be parts of its pathology, yet the tear antioxidant status contributed by smaller molecule antioxidants can be indicative of the disease. Therefore this study is an attempt to present the status of small molecule antioxidants in KC condition as well as the influence of contact lens wear (CLW) in KC as evaluated in the tear specimen.

Tear ascorbic acid levels and the total antioxidant status in contact lens wearers: a pilot study.

Aims: The tear ascorbate owing to its high concentration, functions as an effective antioxidant against the oxidative damage of cornea. Contact lens wearers (CLW) are prone to oxidative stress due to the lens-induced hypoxic conditions. A pilot study was done to compare the tear ascorbic acid level and the total antioxidant capacity give as in normal and CLW.