The LASIK industry & the FDA have conspired since LASIK's inception to purposely withhold information vital to the public in making a truly informed LASIK decision. With, The hope is to show you what the industry and FDA would not and did not even think of doing until LASIK casualties started speaking out, and yet, they still did NOTHING.
Correlations in a change in aqueous tear evaporation with a change in relative humidity & the impact PDF Print E-mail
Friday, 14 April 2006 15:21

Am J Ophthalmol. 2006 Apr;141(4):758-60.

McCulley JP, Aronowicz JD, Uchiyama E, Shine WE, Butovich IA.  Department of Ophthalmology, The University of Texas Southwestern Medical Center at Dallas, Dallas, Texas.

PURPOSE: To establish scientific relationship between relative humidity (RH) and aqueous tear evaporation to elucidate possible significance of this relationship in normals and aqueous tear deficiency patients.

DESIGN: Prospective experimental laboratory study.

METHODS: Ocular surface evaporation was determined using evaporometry and calculated for two ranges of RH, 25% to 35%, and 35% to 45% in a randomized clinical patient population.

RESULTS: Average evaporative rate in the higher humidity range was between 0.029 +/- 0.009 through 0.043 +/- 0.016 mul/cm(2)/min. At lower humidity, range was between 0.044 +/- 0.013 through 0.058 +/- 0.018 mul/cm(2)/min. Differences in the corresponding evaporative rates were statistically significant (between P < .003 through P < .043) for each analysis.

CONCLUSIONS: A decrease of 10% RH resulted in an average difference of between 28.33% to 59.42% increase in evaporation. The increase in evaporation at lower humidity has significant clinical implications for patients with aqueous deficient dry eyes, and possibly those undergoing laser-assisted in situ keratomileusis (LASIK).