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It may fairly be stated that the stock ground contact lenses with spherical scleral shapes cannot be worn successfully by over 90 per cent of all persons. This means comfortable wear, without irritation, for a period of four hours or longer.
One reason for this failure is the fact that the contour of the anterior sclera usually is paraboloid and not spherical. The spherical scleral band of the contact lens almost never conforms to the shape of the eye. Only a very narrow, almost linear band of contact, usually the edge of the lens, exists between the sclera and the lens. The entire pressure from the lids is transmitted along this narrow rim of contact and results in an impression of the sclera and discomfort. The whole width of the scleral portion of a lens need not be in apposition to the eye, but the band of contact should be
EGGERS H. SUGGESTIONS FOR A NEW DESIGN OF STOCK CONTACT LENSES. Arch Ophthalmol. 1939;22(3):403–405. doi:https://doi.org/10.1001/archopht.1939.00860090069008
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