| spherical a. |
zonal aberration in relation to an axial point; see spherical a., negative, and spherical a., positive. Called also dioptric a.
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| spherical a., negative |
unequal refraction of light rays by a lens, the peripheral rays being focused farther from the lens than the paraxial rays.
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| spherical a., positive |
unequal refraction of light rays by a lens, the peripheral rays being focused closer to the lens than the paraxial rays.
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| spherical f. of occlusion |
see under occlusion.
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| spherical form of o. |
an arrangement of teeth that places their occlusal surfaces on the surface of an imaginary sphere, about 8 inches in diameter, with its center above the level of the teeth; see also Monson curve, under curve.
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