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The fitting of contact lenses can be expedited by a saving of time and trouble in the determination of the visual curve. The usual procedure requires measurement of the radius of curvature of the anterior corneal surface with the ophthalmometer and determination of the apparent axial refraction of the eye by neutralization of the patient's spectacle lens. Whenever astigmatism is present the radius of either one of the principal corneal meridians as well as the axial refraction of the eye in that same meridian must be measured. Application of these two measurements to either the graph or the scale supplied by the Zeiss Company will give the approximate required curve for the inner surface of the corneal segment of the contact lens. An afocal contact lens with this corneal radius is then placed over the eye. Finally, additional spherical lenses are placed before the eye in a trial frame until
EGGERS H. AIDS IN THE FITTING OF CONTACT LENSES. Arch Ophthalmol. 1939;21(4):647–649. doi:10.1001/archopht.1939.00860040085008
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