Effect of humidity variations in a controlled environment chamber on tear evaporation after dry eye therapy.

Purpose: Many dry eye (DE) patients are sensitive to adverse environments where tear evaporation rate (TER) increases. Pilot study-A controlled environment chamber was used to determine the time of exposure required for TER to reach steady state equilibrium at 40% relative humidity (RH). Study 1-To assess the difference between normal and DE subjects in their tear physiology response.

Effectiveness of dry eye therapy under conditions of environmental stress.

Purpose: Dry eye is often characterized by increased tear evaporation due to poor tear film quality, especially of the lipid component of the tear film. Using an environmental chamber to induce environmental stress, this study compared the effect of three lubricant eye drops on various aspects of tear physiology in a crossover design (evaporation was the principal outcome measure).

Methods: Three eye drop formulas were tested: 0.