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August 1966


Author Affiliations

Massachusetts Eye and Ear Infirmary 243 Charles St Boston 02114

Arch Ophthalmol. 1966;76(2):309. doi:10.1001/archopht.1966.03850010311030

To the Editor:  From Ridley's work1 it was learned that nonoptical flush fitting scleral lenses are tolerated better than conventional optical scleral lenses. Although both lenses are made from moldings of the eye, the nonoptical lens deviates from the eye's contour when the corneal and limbal portions are ground into a single spherical optical surface. The fact that deviation from the corneal contour leads to a decrease in lens tolerance has also been developed into an important principle in corneal contact lens fitting.2 Attempting to bring these facts to a logical conclusion, our group has developed a lens which closely follows the anterior surface of the eye, yet incorporates a posterior optical surface.The innovation in our method of manufacture is the replacement of the central 6 mm core in the plaster mold of the eye with a metal rod. One end of the rod has a finely

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