Abstract:
PURPOSE: To provide a multifocal point lens in which a light to each focal point, that is, light intensity to each diffraction sequence can be arbitrarily controlled uniformly or non-uniformly. CONSTITUTION: In a three focal point diffraction lens 20 which receives an incident light having a central wavelength λ, and limits three focal points, plural optical high positions and optical low positions are provided on the diffraction surface. Then, a difference between the highest optical high position and the lowest optical low position is substantially different from λ/2, and at least 20% of the incident light of the lens 20 can reach each focal point.
Abstract:
A monofocal contact lens (10) having an anterior surface (34) and a posterior surface is provided. The monofocal contact lens (10) includes an optic zone (30) providing monofocal optical properties located substantially in the center of the contact lens (10) and a peripheral zone (32) surrounding the optic zone (30). The peripheral zone (32) includes a three-dimensional pattern (35) placed on the posterior surface of the contact lens (10). The three-dimensional pattern (35) includes portions not in contact with the surface (33) of the eye (31).
Abstract:
There is disclosed a diffractive optical element (11) and a method to produce same wherein the element comprises a base (13) and at least one phase zone (14) comprising an arbitrary multiplicity M of steps (22) of generally identical step height, wherein M is not a power of 2. The method includes the steps of defining a basic depth unit equivalent to a zone height divided by M, defining a depth sequence of N depths wherein N is the smallest integer greater than log2M such that each of the M steps can be produced by at least one linear combination of the N depths, defining N masks wherein each mask enables the optical element to be processed to one of the N depths and wherein for each mask, the steps to be processed are those which have the one of the N depths in its linear combination and serially utilizing each of the N masks for processing of the optical element.
Abstract:
A diffractive optical element (11) and a method to produce same is disclosed. The optical element (11) comprises a base (13) and at least first and second phase zones (14) wherein the first phase zone (14) comprises a first multiplicity of steps (22) and the second phase zone comprises a second multiplicity of steps (22) and wherein a distance from an ith step of said first phase zone (14) to said base (13) is different than a distance of an ith step of said second phase (14) zone to said base (13), for at least one value of i. The method to produce the diffractive optical element (11) of the present invention includes the step of defining a collection of masks for creating stepped phase zones (14) wherein at least one of the collection of masks completely masks out at least one step (22) of at least one phase zone (14) such that the at least one step (22) of the at least one phase zone (14) will not be etched.
Abstract:
In a secure imaging system for securing documents or encrypting images, an image comprises an array of printed positions formed using a group of inks each having a predetermined spectrum. The positions are selected to form a predetermined image, either real or virtual, when the image is viewed through an optical processor. An image formed using inks having the same colors as experienced by the human eye, but not sharing exactly the same spectra, will fail to form the correct predetermined image.
Abstract:
A tri-focal diffractive lens defining three foci, for viewing a band of light having a representative wavelength of λ, including a diffractive surface having a number of optical heights, h o , wherein the difference between the highest and the lowest optical heights is, modulo λ, substantially different from λ/2, wherein each of the foci receives at least 20% of light incident on the lens.
Abstract:
A simultaneous multifocal contact lens (10) for correcting vision acuity of an individual is disclosed. The contact lens comprises a central region (25) radially surrounded by at least one far vision focal region (30) and at least one near vision focal region (26), wherein a near vision additional correction of the at least one near vision focal region (26) is ovecorrected by at least 10 % with respect to the near vision additional correction prescribed for the individual according to the standard prescription for lens radius design.
Abstract:
A progressive multifocal lens for eyeglasses formed along a principle meridian curve, with a farsighted vision zone (1) having an optical power corresponding to that required for viewing distant objects, a nearsighted vision zone (3) having an optical power corresponding to that required for viewing near objects, and an intermediate vision zone (2) between and progressively connecting the farsighted vision zone and the nearsighted vision zone, includes a transparent, non-rotationally-symmetrical, microrelief structure in one or more of these vision zones.
Abstract:
A monofocal contact lens (10) having an anterior surface (34) and a posterior surface is provided. The monofocal contact lens (10) includes an optic zone (30) providing monofocal optical properties located substantially in the center of the contact lens (10) and a peripheral zone (32) surrounding the optic zone (30). The peripheral zone (32) includes a three-dimensional pattern (35) placed on the posterior surface of the contact lens (10). The three-dimensional pattern (35) includes portions not in contact with the surface (33) of the eye (31).
Abstract:
A simultaneous multifocal contact lens (10) for correcting vision acuity of an individual is disclosed. The contact lens comprises a central region (25) radially surrounded by at least one far vision focal region (30) and at least one near vision focal region (26), wherein a near vision additional correction of the at least one near vision focal region (26) is ovecorrected by at least 10 % with respect to the near vision additional correction prescribed for the individual according to the standard prescription for lens radius design.