In the past 15 years, the use of corneal contact lenses has gained great popularity. Consequently, much has been written about fitting techniques, the optics involved, and the pathophysiology associated with wear. However, the question of what holds the lens to the eye has received very little critical attention. The brief analyses found in the literature credit adherence of the lens to the cornea as due to either capillarity,1 or a type of surface tension which holds moist glass plates together.2 Both of these explanations fail to take notice of the thin tear film which bathes the anterior surface of the lens. This prelens tear film has the effect of immersing the aforementioned glass plates into a solution which encourages their separation. The presence of the film can be simply verified by applying fluorescein to an eye with a corneal contact lens in place and making an
MILLER D. An Analysis of the Physical Forces Applied to a Corneal Contact Lens. Arch Ophthalmol. 1963;70(6):823–829. doi:10.1001/archopht.1963.00960050825018
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