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In the article "The Oils of the Meibomian Glands," by Brown and Dervichian (82:537, 1969), the statement that the minimal thickness "was about 0.2μ, which is much greater than the wave length of light," should have read "The minimal film thickness was about 0.2μ which is less than the visible wave length of light."
CORRECTION. Arch Ophthalmol. 1970;83(3):383. doi:10.1001/archopht.1970.00990030383023