Abstract: Photochromic diaryl-2H-naphthopyran structures, which dye photochromically well at room temperature, lighten up quickly when incorporated into ophthalmic lenses, possess longevity, and due to their special structure, have a reduced tendency of the molecules to migrate in plastics.

Abstract: Disclosed is a process for the production of a photochromic object, composed of a polymer and containing at least one spirooxazin compound, having the following process steps: an acrylate monomer or a methacrylate monomer, respectively a mixture of a multiple thereof is utilized as the polymerizable monomer, the photochromic dyes as well as a polymerization initiator are mixed in the polymerizable monomer, the mixture yielded thereby is placed in a casting mold, polymerized and hardened. The present invention is distinguished by, in order to obtain a neutral gray, neutral brown or green photochromic tint of the polymerizable mixture, several photochromic dyes being added of which at least one is not a spirooxazin, and by the concentration of the spirooxazin compound(s) amounting to no more than 0.045 weight percent relative to the mass of the utilized monomer, and that of the polymerization initiator(s) amounting to more than 1 weight percent relative to the mass of the utilized monomer.

Abstract: What is described here are photochromic naphthopyrane dyes with different substituents whose properties can be set by controlled selection of the substituents. In this manner it is possible to take an influence on the migration characteristics, the absorption characteristics and the brightening rate and kinetics. The inventive compounds display good darkening and brightening properties at a very good service life.The invention excels itself by the fact that a method is made available which is substantially improved over prior art, in addition to the surprising influence on specific properties of the inventive compounds. The described compounds are suitable for application in synthetic materials of any kind.A photochromic object is also the subject matter of the invention, which comprises one or several photochromic naphthopyrane dyes as well as at least one polymer material, with the photochromic object being producible by mass-dyeing or superficial dyeing.

Abstract: A template (1) intended for the lens of a pair of glasses (4), in which the template includes holes (14) for determining a drilling position for applying marks. The template (1) can be connected to a blocking member (10, 11) provided on the lens of the glasses (4) so that the template cannot be displaced and remains rotationally fixed relative to the blocking member (10, 11). The hole or the mark thus remains in a fixed position relative to the glasses lens.

Abstract: Disclosed is an object made of plastic material, in particular a plastic ophthalmic lens, colored with at least one photochromic substance which is also excited by light in the UV range of the spectrum and has a higher absorption in the excited state, judged by the spectral light sensitivity of the human eye, than in the not excited state and to which, in addition, at least one UV absorbing material is added in such a concentration that darkening of the photochromic substance(s) is independent of the UV fraction of the excitation light.But rather the intensity of the darkening depends on brightness, i.e. the intensity integrated over the spectral light sensitivity of the human eye V.sub.2.

Abstract: Disclosed is a scanning system havinga light source,a collimator lens,a scanning unit anda scanning objective. The present invention is distinguished by that for the correction of the chromatic aberration over a large wavelength range, only the transverse chromatic aberration of the scanning objective is corrected, and that the intersection lengths of the light rays having wavelengths in the wavelength range over which the scanning system is to be corrected chromatically is dimensioned after the collimator lens in such a manner that the longitudinal chromatic aberration of the scanning system is compensated as well.

Abstract: Photochromic diaryl-2H-naphthopyran structures, which dye photochromically well at room temperature, lighten up quickly when incorporated into ophthalmic lenses, possess longevity, and due to their spacial structures, have a reduced tendency of the molecules to migrate in plastics.

Abstract: Disclosed is an ophthalmic lens having a progressive optic power, this lens being provided with at least one surface having a surface power which changes in such a manner that, starting from at least one region, in which the optic power of the ophthalmic lens is practically constant, the optic power of the ophthalmic lens changes along at least one line (hereinafter referred to as the main line) which may lie in a plane or be sinuous and on which there is a prescribed astigmatism which is not identical with zero diopter. The surface astigmatism on the main line not only being a specific amount but also having a usually not constant axial position along the main line in such a manner that the resulting overall astigmatism of the bundle, allowing for oblique astigmatism, being practically constant along the main line after the surface of the lens facing the eye or being variable with regard to both said amount and said axial position according to physiological requirements.

Abstract: Disclosed is a photochromic compound having a diaryl-3H-napthopyran structure, which has at the 8-position a nitrogen atom-linked hetercyclus, in which the heterocylcus can also have a HALS compound as a substituent or the heterocyclus itself can be formed as a HALS compound.Furthermore a photochromic compound is described having a diaryl-3H-naphtopyran structure which has at the 8-position an N-atom linked and an alkyl-bridge linked HALS compound.

Abstract: Optical glasses or lenses are described having a refractive index that varies as a function of at least one coordinate, which is made from a starting material with a constant refractive index by ion exchange. Greater index gradients than with the prior art are achieved by special compositions and ion exchange baths intended therefor. In addition, the stability of the glasses is increased.

Abstract: The description concerns a photochromicsubstance, with a diaryl-2H-naphthopyrane having a link in the form Y--Ar, Z--Ar, Y--Ar--Y, Y--Ar--Y', Y--Ar--Z, Z--Ar--Z or Z--Ar--Z', in which Y, Y', Z and Z' are pyranes. The photochromic substance is also distinguished in that it has an aryl substituent which reduces the migration of the molecules in plastics.

Abstract: An ophthalmic lens in which one surface is provided with at least one region, in which the refracting power is practically constant except for aspherical corrections, and at least one transition region which is adjacent to the region having practically constant surface refracting power, and in which the surface refracting power increases or decreases continuously, and the other surface is provided with an astigmatic effect. The orientation of the surface having an astigmatic effect relative to the surface having continuous refracting power change is dependent on the position of the axis of the astigmatism of the eye. The surface having an astigmatic effect deviates from the toric shape and is independent of the orientation of the surface relative to the surface having continuous refracting power change which is a surface optimized for the axial position of 0.degree..

Abstract: A series of progressive ophthalmic lenses, each having a varying surface power in a distance part and/or a varying increase in surface power from a distance part to a near part, includes a front surface having a continuously varying surface power and an eye-facing surface, principal sections of which have varying powers and at least one of which deviates from a circular form. The lenses have astigmatic power and are distinguished by a deviation (dz) between an apex circle and a sagitta of each principal section, as given by the equation:dz=a.sub.j *r.sup.2 +b.sub.j *r.sup.4with coefficients.vertline.a.sub.j .vertline..ltoreq.2*10.sup.-4 mm.sup.-1.vertline.b.sub.j .vertline..ltoreq.1*10.sup.-6 mm.sup.-3and where coefficients a.sub.j2 and b.sub.j2 are yielded by the following functionals:a.sub.j =f.sub.j1 (sph,zyl)=a.sub.j1 (sph)+b.sub.j1 (sph)*zylb.sub.j =f.sub.j2 (sph,zyl)=a.sub.j2 (sph)+b.sub.j2 (sph)*zylwith coefficients a.sub.j2 and b.sub.j2 being a function of a second order.

Abstract: The present description refers to a series of progressive lenses, wherein the lenses present a different surface power in the distance-vision part and/or a different increase of the surface power from the distance-vision part towards the near-vision part (termed addition Add hereinafter), and whereof eachcomprises a front surface having a continuously varying surface power which increases from the respective value BK ?dpt!, which is suitable for distance vision, at the point having the coordinates x=0 mm, y=8 mm in the lower region of the distance-vision part along a wound line (primary line), which coincides approximately with the primary line of view, with eyes dropped, towards a value suitable for near vision in the upper region of the near-vision part, which value is greater than the value of the surface power BK in the lower region of the distance-vision part by the value ADD ?dpt! of the addition, andhaving a surface, in particular the surface on the concave side, which has a spherical shape or an asphe

Abstract: Disclosed are photochromic oxazine compounds, yielded by means of condensation of an aldehyde bearing in the .alpha.-position to the aldehyde group a halogen or hydroxy group (reacting agent 1), with (substituted) ortho-aminohydroxy aromatic compounds (reacting agent 2).

Abstract: The invention relates to a hinge connection between an eyeglass temple and a frame for eyeglass lenses. The eyeglass temple possesses at its end to be connected to the frame a joint element (1) which can be directly coupled to the frame without any snapping effect with a corresponding mounting element (7). The joint element (1) possesses a prolongation, which is connected to the eyeglass frame, with a pin (4) where the ends (5,6) of the pin (4) protrude beyond the prolongation on opposite sides of it. The mounting element (7) possesses two spaced arms (8,) which each surround one of the ends (5,6) of the pin (4) protruding beyond the prolongation of the joint element (1). At least one of the arms (9) surrounds the pin end (5) only partially while forming an introduction aperture (12). When inserting the pin (4) in the pin mounting apertures by pushing the pin (4) in the direction of its longitudinal axis, the prolongation is guided through the introduction aperture (12).

Abstract: A progressive spectacle lens is described which has a convex aspherical front surface 1 and a concave aspherical back surface 2, of which at least one surface contributes to the power increase from the distance portion 3 over the progression corridor 4 to the reading portion 5. The progressive spectacle lens in accordance with the present invention is characterized by the fact that the surface 1 or the surfaces contributing to the power increase are designed in such a way that the main portion of astigmatism is transposed into an area 3 in which the power practically does not increase and by the fact that the surface astigmatism of the two surfaces 1 and 2 substantially cancel each other out in these areas 3 or 6. (See FIG. 1).

Abstract: Photochromic compounds with a 3H-naphthopyran structure having at least one pyrene moiety in the 3-position, a method for preparing such compounds, and the use of such compounds for producing photochromic articles from an organic synthetic material.

Abstract: A photochromic compound, in particular, for tinting optical elements made of a plastic material has reduced mobility in plastic material. The photochromic compound is a photochromic 2H-pyran and is distinguished by the aromatic residues being chemically rigidly attached in the 2-position to a spiropyran.