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The corneal contact lens is a new type of lens consisting of a small shell. 11 to 12 mm. in diameter, which is applied directly to the cornea. The lens was developed, in part, by the department of ophthalmology of the College of Medical Evangelists, Los Angeles.
The lens is applied to the eye without any solution, and there is only a capillary layer of tears between the lens and the cornea. The inner surface of the lens is made on a slightly longer radius than the radius of the outer surface of the cornea, so that the tears which fill the space between lens and cornea form a concave meniscus lens. The power of this "lacrimal" lens is given by the makers of the contact lens as about — 1.50 D. This does not seem correct, as can be seen by a simple calculation. (The discussion here presented has
PASCAL JI. POWER OF THE LACRIMAL LAYER IN THE CORNEAL CONTACT LENS. AMA Arch Ophthalmol. 1951;45(2):194. doi:10.1001/archopht.1951.01700010199008