Ophthalmic lens
AssigneeSola International Holdings Ltd.
InventorsAnthony Dennis Miller, Saulius Raymond Varnas
Life of this patent
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Abstract
An ophthalmic lens element having a first surface and an atoroidal or generally aspheric second surface. The second surface is described by a symmetric polynomial whose coefficients have been chosen to minimize a merit function constructed of the sum of a particular optical aberration over substantially the entire surface thereof.
Claims22
An ophthalmic lens element having a first surface and an atoroidal or generally aspheric second surface, the second surface being described by a symmetric polynomial whose coefficients have been chosen to minimize a merit function constructed of the sum of a particular optical aberration over substantially the entire surface thereof.
An ophthalmic lens element including a first surface wafer having a first lens surface, and a second surface wafer having a second lens surface, the second surface having an atoroidal or generally aspheric shape and being described by a symmetric polynomial whose coefficients have been chosen to minimize a merit function constructed of the sum of a particular optical aberration over substantially the entire surface thereof.
An ophthalmic lens element including a second surface wafer for use with a first surface wafer, the second surface wafer having a front surface and a back surface, the front surface of the second surface wafer having an atoroidal or generally aspheric shape and being described by a symmetric polynomial whose coefficients have been chosen to minimize a merit function constructed of the sum of a particular optical aberration over substantially the entire surface thereof, the back surface of the second surface wafer being suitable for combination with the first surface wafer.
A method of designing an ophthalmic lens element having a first surface and an atoroidal or generally aspheric second surface, the method including selecting a symmetric polynomial for the second surface, selecting a merit function relating to at least one optical aberration, minimizing the merit function over the substantially entire surface thereof to generate a modified surface function, and shaping the second surface to the modified surface function.
A method of designing an ophthalmic lens element having a first surface and an atoroidal or generally aspheric second surface, the method including the steps of;
- selecting a base surface function for the second lens surface in the form of an nth order symmetric polynomial of the form z = ∑ k = 0 , 2 , ... n ∑ j = 0 , 2 , ... k C k - j , j x k - j y j ;
- selecting a merit function relating to at least one optical aberration characteristic of the lens that needs to be minimized;
- computing the coefficients of the symmetric polynomial surface Ck-j,j that minimise the merit function over the substantially entire surface of the ophthalmic lens element to generate a modified surface function;
- and
- fabricating an ophthalmic lens element having a second lens surface shaped according to the modified surface function.
Dependencies are inferred from the claim text.