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The insertion of contact lenses having a uniform scleral curvature with a round corneal section set in the middle is fairly easy. The lens is placed on the rubber sucker without being oriented one way or the other, and the sucker, likewise without being oriented one way or the other, is approached to the eye and the lens inserted. But when the contact lens has different scleral curvatures in different directions and/or an oval corneal section centered or decentered in the scleral circumference, the process of insertion becomes considerably more difficult ; for it is essential that such a lens be inserted so as to have its parts definitely related to parts of the eye. All lenses made to order from individual molds, as well as the newly introduced contact lenses with toric scleras, have to be placed on the eye in a definite position. There is an upper, lower, nasal
Pascal JI. AN AID TOWARD CORRECTLY INSERTING CONTACT LENSES. Arch Ophthalmol. 1939;21(3):513–514. doi:10.1001/archopht.1939.00860030121014
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