OPHTHALMIC LENS
摘要:
An ophthalmic lens has a cross-sectional shape in an arbitrary meridian direction on a lens surface of the ophthalmic lens. The cross-sectional shape is expressed by the following formula (1), Z = c ⁢ r 2 1 + [ 1 - c 2 ⁢ r 2 ⁡ ( k + 1 ) ] 1 / 2 + A ⁡ ( θ ) ⁢ r 2 + B ⁡ ( θ ) ⁢ r 4 . In the formula, c is a paraxial curvature of the ophthalmic lens, r is a distance from a lens center of the ophthalmic lens, k is a conic constant of a surface which is in rotation symmetry with respect to an optical axis of the lens in the ophthalmic lens. The variables c, r and k are used in common in the meridian direction on the lens surface, and A(θ) and B(θ) are parameters expressed by functions depending on an angle in the meridian direction.
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