摘要:
Ophthalmic lens comprising: a primary zone on a first face; a secondary zone on the first face between said primary zone and the peripheral edge of the lens; first and second regions forming a partition of the secondary zone, which are contiguous and alternate with a pitch. A spectacle eyeglass obtained from said lens produces a first ophthalmic correction in the primary zone and in the first regions, and a second ophthalmic correction in the second regions different from said first ophthalmic correction. An active system of vision comprises an occultation device comprising: a selection device for selecting the wearer's viewing state; an optical occultation system to occult alternatively a first group and a second group according to the wearer's viewing state selected by the selection device, the first group comprising at least the primary zone and the first regions, and the second group comprising at least the second regions.
摘要:
A predictive calculation method for calculating the shape of a cross-section of an engagement ridge of an ophthalmic lens obtained by beveling the lens with a beveling grindwheel driven in accordance with an initial path setting. The method includes the following steps: acquiring the initial path setting for the beveling grindwheel relative to the lens; determining at least two approximations (Sii, Sij) of the shape of the cross-section under consideration of the engagement ridge, the approximations being deduced from the intersection between the beveling grindwheel and the ophthalmic lens when the beveling grindwheel is situated at two distinct positions of the initial path setting; determining the intersection between these two approximations; and deducing therefrom the shape (Si) of the cross-section under consideration of the engagement ridge.
摘要:
A transparent, non elastomeric, high refractive index, impact resistant poly(thio)urethane/urea material comprising the reaction product of: a) at least one (α, ω)-diiso(thio)cyanate cycloaliphatic or aromatic polysulfide prepolymer, and b) at least one aromatic primary diamine, in an equivalent molar ratio amine function/iso(thio)cyanate function ranging from 0.5 to 2, wherein, said prepolymer and diamine are free from disulfide (—S—S—) linkage and wherein the (α, ω)-diiso(thio)cyanate polysulfide prepolymer is the reaction product of at least one cycloaliphatic or aromatic diiso(thio)cyanate and at least one (α, ω)-diol prepolymer.
摘要:
The invention provides an adjustment method for adjusting a binocular display, the display comprising for each eye of the wearer, an optical imager for shaping light beams corresponding to an image emitted by a beam generator device and for directing them towards each of the wearer's eyes so as to enable information content contained in a virtual image to be viewed, the display being associated with a pair of eyeglasses having two lenses supported by a frame. According to the invention, the method consists in moving at least one said lens (10A, 10B) relative to said frame (11) with three degrees of freedom, in order to obtain superposition of the two virtual images, each said imager being contained in said lens (10A, 10B) of said pair of eyeglasses.
摘要:
A spectacle eyeglass of progressive addition type has been designed for myopic children. To this purpose, an ergorama has been constructed, taking into account vision conditions encountered by the children in their everyday life. In particular, the eyeglass has a limited optical power increase between two reference eye directions (D1, D2), a start (D0) of the optical power increase which is located quite low in the eyeglass, and an offset value (OS) for a meridian line (ML) which is higher than that of eyeglasses designed for adults.
摘要:
A lens (1) includes a plurality of optical surfaces (S1, S2) each of which is made up of an alternation of active zones (ZA1, ZA2) and separation zones (ZS1, ZS2). The active zones of one of the surfaces are situated beside the separation zones of the other surface. The shape of one at least of the optical surfaces is then adapted into the separation zones in order to augment the acute angles that are situated at the convergence of active zones and separation zones. The lens can thus be made with improved accuracy with respect to a target optical function.
摘要:
Optical patches are assigned to prescriptions so as to reduce the total number of patch surfaces which are involved. The prescriptions are produced by varying at least one of a front patch surface (S1) and rear patch surface (S2) which are combined to form an optical patch, in accordance with prescription segments. The front patch surfaces (S1) are pseudo-spherical and the rear patch surfaces (S2) include a Fresnel structure superimposed on a pseudo-spherical base shape.
摘要:
An optical wavefront correction plate incorporates a unique, three-dimensional spatial retardation distribution utilizing the index of refraction change of resin mixture in its cured state. The optical wave plate comprises a pair of transparent plates, containing a layer of a monomers and polymerization initiators, such as resin mixture. This resin mixture exhibits a variable index of refraction as a function of the extent of its curing. Curing of the resin mixture may be made by exposure to light, such as ultraviolet light, and may be varied across and through the surface of the resin mixture to create a particular and unique three-dimensional wavefront retardation profile. The optical wave plate provides improved performance in large area mirrors, lenses, telescopes, microscopes, and ophthalmic diagnostic systems.
摘要:
A method and a computer system and its components for providing spectacles adapted to a future wearer. The method comprises the steps of: inputting in a computer system a first set of data (F1) related to the wearer, comprising at least a prescription of the wearer, inputting in the computer system a second set of data (F2) related to a spectacle frame chosen by the wearer. The computer system is provided with processing means for outputting, on the basis of the first and second sets of data, at least one set of data (S1, S2, . . . , SN) characterizing a pair of ophthalmic lenses adapted to the wearer and the chosen frame.
摘要:
A method of determining binocular performance of a pair of spectacle lenses comprises: a eyes characteristics providing step, a pair of spectacle lenses providing step, a environment providing step, a cyclopean eye positioning step, a binocular performance criteria defining step, and a binocular performance criteria determining step, wherein the cyclopean eye position is customized.