초록

A diffractive, multifocal ophthalmic lens including an apodization zone with echelettes having a smoothly reduced step height to shift the energy balance from the near image to the distant image and thus reduce the glare perceived when viewing a discrete, distant light source.

대표청구항 ▼

A method of reducing the glare associated with a diffractive, multifocal ophthalmic lens producing a distant image and a near image, the diffractive, multifocal ophthalmic lens having a plurality of echelettes located at a radius ri from an optical axis of the lens, each of the echelettes having a s

A method of reducing the glare associated with a diffractive, multifocal ophthalmic lens producing a distant image and a near image, the diffractive, multifocal ophthalmic lens having a plurality of echelettes located at a radius ri from an optical axis of the lens, each of the echelettes having a step height, the method comprising the steps of: a) selecting a base curve; b) calculating the position, ri, of each echelette with respect to the base curve; c) choosing the step height for each echelette; and d) progressively reducing the step height of each echelette by an apodization factor �apodize in a selected apodization zone, the reduction in the step height increasing for each echelette in the apodization zone as the distance of each echelette from the optical axis increases; whereby the glare associated with a diffractive, multifocal ophthalmic lens is reduced by shifting the energy balance between the near image and the distant image by smoothly reducing the step height of each echelette in the apodization zone.