The invention relates to method for designing and machining an ophthalmic lens, a method for producing a bevel-edged lens, and the corresponding lenses. More specifically, the invention relates to a method for designing an ophthalmic lens, comprising steps of: defining a central zone (5) with a central periphery (3) matching the periphery of a frame; defining a temporal line (11) that divides the central zone into a nasal zone, with a useful periphery (15), and temporal zone; and determining a prescription for a user. The temporal line is outside a cone (7) with an opening angle of 30º, the apex of which is at the centre of rotation of the user's eye and the axis of which is the optical axis. The thickness of the lens is optimised according to the thickness of the periphery of the nasal zone. Subsequently, a transition zone (21) is defined, which extends between the useful periphery and the outer periphery (27) of the lens.
Lens comprising a polymeric substrate, a hardening layer and a metallic layer. Lens comprising a substrate of polymeric material (P), and which is coated with a hardening layer (E) and a metallic layer (M) that is between 1 and 20 nm thick. The coating also has an anti-humidity layer (AH) made of a material from the group made up of ZrO2, Nb2O3, Ta2O5, CeO2, HfO2, La2O3, TiO2, Pr2O3, Sc2O3, WO3, Y2O3, ZnS and the combinations thereof, that is between 35 nm and 55 nm thick, where between the anti-humidity layer (AH) and the hardening layer (E) there is no other sandwiched layer that is thicker than or equivalent to the anti-humidity layer (AH). Over the metallic layer (M) there is a first high refraction index layer (A1 ), and a first low refraction index layer (B1 ).
The invention relates to a method for designing and manufacturing a monofocal ophthalmic lens and corresponding lens. In the method for designing a surface of a monofocal ophthalmic lens, the surface is defined by an analytical function such as: Formula (I) where a5 is other than 0 and at least one of the coefficients a6, a7 and a8 is other than 0, such that it includes a hyperbolic component and an exponential component. The coefficients can be calculated by means of an iterative calculation and a merit function such as: Formula (II) where mi, is the value of said optical property at a specific viewing angle β with respect to the optical axis of the lens, and αi is a weighting value. The optical properties can be calculated using, for example, ray tracing.
Finished ophthalmic lens and corresponding methods. Finished ophthalmic lens that has a concave face and a convex face and an external perimeter (1) and that furthermore has: a thickness within a pre-established range; a central working area (3) that complies with a specific pre-established ophthalmic prescription, defined by a machined surface, and which has a working perimeter (5) that coincides with the perimeter of a specific pre-established frame; and an outer, transition area that connects the working perimeter (5) of the central working area (3) to the outer perimeter (1). The transition area (7) comprises a transition surface that extends as a continuation of the machined surface and extends as far as the outer perimeter (1) and is continuous, and the derivative thereof is continuous at all the points thereof, including the line connecting between the transition surface and the machined surface.
B24B 13/06 - Machines or devices designed for grinding or polishing optical surfaces on lenses or surfaces of similar shape on other workAccessories therefor grinding of lenses, the tool or work being controlled by information carrying means, e.g. patterns, punched tapes, magnetic tapes
B24B 49/00 - Measuring or gauging equipment for controlling the feed movement of the grinding tool or workArrangements of indicating or measuring equipment, e.g. for indicating the start of the grinding operation
B24B 9/14 - Machines or devices designed for grinding edges or bevels on work or for removing burrsAccessories therefor characterised by a special design with respect to properties of materials specific to articles to be ground of non-metallic inorganic material, e.g. stone, ceramics, porcelain of glass of optical work, e.g. lenses, prisms
5.
POLYMER LENS COMPRISING A HARDENING LAYER, AN ABSORBENT LAYER, AND AN INTERFERENTIAL MULTILAYER, AND CORRESPONDING PRODUCTION METHOD
The invention relates to a polymer lens comprising a hardening layer, an absorbent layer, and an interferential multilayer, and to a corresponding production method. Said polymer lens comprises a hardening layer (L), an interferential multilayer (I), and an absorbent layer (A) therebetween. The absorbent layer (A) is formed from a metal, a metal oxide or a metal nitride that can produce a transparent layer by means of sputtering deposition, and also comprises cations of a colouring metal of the group formed by the transition elements that, in an oxidised form, have a cation that absorbs electromagnetic radiation in the visible spectrum. Between 10 atom % and 70 atom % of the cations, in relation to the predominant metallic cation in said absorbent layer (A), are said colouring metal cations.
The invention relates to a tool (10) for polishing optical surfaces (21), which tool comprises a rigid base (11) that has a spherical surface (14) that bears an elastic cushion (12), which has a polishing face (16), characterised in that the diameter of the rigid base (11) is between 50 and 65 mm, the radius of curvature of the spherical surface (14) is between 54 and 60 mm, the thickness of the elastic cushion (12) is between 13 and 16 mm and the compression strength of the elastic cushion (12) is substantially between 0.08 and 0.15 bar at 10% compression and substantially between 0.55 and 0.8 bar at 70% compression. The invention also relates to the use of said tool to polish an optical surface, in particular an ophthalmologic lens and, more specifically, a free-form lens.
B24B 13/02 - Machines or devices designed for grinding or polishing optical surfaces on lenses or surfaces of similar shape on other workAccessories therefor by means of tools with abrading surfaces corresponding in shape with the lenses to be made
7.
POLYMERIC BASED LENS COMPRISING A HARDENING LAYER, AN INTERFERENTIAL MULTI- LAYER AND A HARD LAYER SANDWICHED BETWEEN BOTH, AND CORRESPONDING MANUFACTURING METHOD
Polymeric based lens comprising a hardening layer (L), an interferential multi-layer (I) and a hard layer (D) sandwiched between both, and corresponding manufacturing method. Polymeric based lens comprising a hardening layer (L), over 500 nm thick, and an interferential multi-layer (I) made up of a plurality of sub layers each of which is less than 250 nm thick. The lens comprises, in addition, a hard layer (D) sandwiched between the hardening layer (L) and the interferential multi-layer (I), where the hard layer (D) is over 300 nm thick. The lens can also have a flexible layer (F), obtained by polymerizing organometallic monomers by means of PECVD and/or sputtering, arranged between the hardening layer (L) and the hard layer (D). The manufacturing method comprises a high vacuum activation phase of the hardening layer (L) surface, before the hard layer (D) formation stage.
Optical device that comprises a spatial light modulator and a spectral filter that normally comprise various parts, such that each part of the filter (V; R; A; L) corresponds to at least one part of the modulator. The spectral filter is superposed on the spatial light modulator such that the transmittance of each part of the filter is coordinated with the phase offset introduced by the corresponding part of the modulator. In one embodiment, the spatial light modulator is a programmable liquid-crystal device. The invention presents various ways in which to coordinate the transmittance of each part of the spectral filter with the programmed time variation of the phase offset introduced by each part of the spatial light modulator, such that each part of the latter receives light at a spectrally filtered wavelength and focuses it in the same plane.
G02F 1/01 - Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulatingNon-linear optics for the control of the intensity, phase, polarisation or colour
