Abstract: Polychromatic compounds of pyrans having a substituted adamantane or a polycyclic ring system, with the exception of adamantane, in the 2-position of the pyran ring, having the structure ##STR1## whereby the residues R.sub.1 -R.sub.4 are independently substituents selected from the series H, alkyl, substituted phenyl, phenyl, naphthyl, OH, alkoxy (C.sub.1 -C.sub.4), halogen, alkylamino, dialkylamino, cyan, trifluormethyl, or, R.sub.1 and R.sub.2 or R.sub.3 and R.sub.4 or R.sub.2 and R.sub.3 are constituents of at least one condensed aromatic, heteroaromatic or an alkane ring, wherein said heteroaromatic ring is selected from the group consisting of pyridine, pyrimidine, pyridazine, quinoline, isoquinoline, naphthyridine, quinazoline, quinoxaline, phthalazine, pteridine, phenazine, and benzoquinoline which are substituted by the same residues as R.sub.1 -R.sub.

Abstract: Disclosed are adamantaneospiroheteroaromaticpyrans and adamantanospiro (1.3)oxazines of the general formula ##STR1## whereby R.sub.0 is a substituent from the series H, halogen, O-alkyl, N-alkyl,R.sub.1 -R.sub.4 : is a substituent from the series H, alkyl, aryl, subst. phenyl, naphthyl, heteroaryl, OH, alkoxy (C.sub.1 -C.sub.4), halogen, alkylamino, dialkylamino, cyan and trifluormethyl, orR.sub.1 and R.sub.2 or R.sub.3 and R.sub.4 or R.sub.2 and R.sub.3 are constituents of a condensed aromatic or heteroaromatic ring or an alkane ring with 4-8 C-atoms.

Abstract: An optically transparent photochromic plastic material is described which is comprised of materials with a sulphur content and which via polymerization processes contains photochromic organic compounds as solid ingredients, which possess at least two ring systems linked via carbon atom and whose photochromic tint is based on a reversible bond rupture to the spiro-C atom.

Abstract: A compound is described with the general formula ##STR1## where R.sup.1 is one to four substituted groups from the series --Z, --OZ, --NZ.sub.2, --NHZ, NH.sub.2, CN, CF.sub.3 with Z: C.sub.1 -C.sub.5 alkyl, phenyl, pyridyl, benzylR.sub.2 =--H, --Z, --CH.sub.2 Z,R.sub.3,R.sub.4,R.sub.5 =--NH.sub.2, --NHZ, --NZ.sub.2, --OZ, --Z, --HR.sub.6 =--H, --Z, --OZ, --CN, --NO.sub.2HAr=heteroaromatic substances with two or three cores and with 1 or 2N atoms in accordance with one of the following structural formulae: ##STR2## The compounds in accordance with this invention have the advantage that their migration in plastic materials usually used for spectacle lenses is lower so that no softening agent effect occurs which would be of a disadvantage for the coating of such lenses with, for example, anti-reflection coating layers.

Abstract: An optical system for imaging the light from light sources having varying astigmatic differences of focus in different planes, having an optical element with an astigmatic effect and having an imaging lens system, the optical element having an astigmatic effect being provided with two lens components, the distance of which in the direction of the optical axis can be adjusted in order to correct astigmatic differences of focus varying from light source to light source and/or changing astigmatic differences of focus due to aging.

Abstract: Disclosed is a progressive ophthamic lens having positive distance portion power, in which at least one surface is designed as a progressive area, and a distance portion (FT) intended for distant vision having practically constant distance portion power and a near portion (NT) intended for hear vision having practically constant near portion power including a progression zone (PZ), in which the surface refractive power increases from the surface refractive power (D.sub.F) present at the distant reference point (B.sub.F) along a curved of plane main meridian (HM) to the surface refractive power (D.sub.N) present at a near reference point (B.sub.N).

Abstract: An ophthalmic lens having a front and an eye-facing boundary surface and a varying refractive index, which contributes to the correction of aberrations. The ophthalmic lens is distinguished by having at least one system of surfaces at given level (n(x,y,z)=const.) with a constant refractive index, which are spaced the same distance at all points in the direction of their surface normals (parallel surfaces), and which, respectively their extension, intersect the axis connecting the lens apexes of the front surface and the eye-facing surface.

Abstract: An ophthalmic lens for use in the correction of astigmation, wherein in order to reduce the critical thickness and/or the variation of the edge thickness along the circumference of the lens, the refractive index changes at least along the critical main section in such a manner that at least part of the cylindrical correction is attained by the refractive index variation.

Abstract: A progressive ophthalmic lens comprising a distance portion, the refractive power of which being designed for distance vision, a reading portion, the refractive power of which being designed for near vision, and an intermediate portion, in which the refractive power along the main line of vision at least partially increases continuously from the refractive power of the distance portion to the reading portion. A refractive index of the lens material varies along the main line of vision at least in the intermediate portion so as to at least partially contribute to the increase in refractive power and correction of aberrations.

Abstract: Disclosed is a photochrome compound having a spirooxazine structure in a, as such known manner.In accordance with the present invention conjugated diazole-napthoxazine or oxazole-, thiazole, benzoxazole-or benzthiazole systems are added to the basic structure.Improved absorption in the wavelength range .alpha. than 350 nm as well as improved migration properties are yielded by this means.

Abstract: A multifocal lens is described with a main lens designed for distance vision and a segment designed for near vision.The lens in accordance with the present invention is characterized by the fact that one surface of the segment consists of the progression area and the reading portion of a progressive surface.In an advantageous further development the progressive surface whose progression area and reading portion form one surface of the segment is designed in such a way that its surface astigmatism is concentrated essentially in the distance portion.

Abstract: A motion regulator for a hinge such as, for example, a tripartite eyeglass hinge, with at least two hinge tabs and a hinge screw, a sleeve surrounding the hinge screw disposed in a hinge eye of the hinge tab. The sleeve projects beyond the hinge tab and rests against a neighboring hinge tab or tabs. In order to obtain an objective that a braking torque, determining the motion characteristics of the hinge, is substantially constant and independent of the tightening torque of the hinge screw, a spring-elastic element is arranged at least between the hinge tab wherein the sleeve is located and the hinge tab movable with respect to this hinge tab. The spring-elastic element, resilient in the axial direction with respect to the hinge screw axis, is in contact under a pretensioning with a contact surface of at least one hinge tab, which surface is rotationally symmetrical with respect to the hinge screw axis.

Abstract: A progressive power ophthalmic lens having a convex front surface and a concave inner surface, of which at least one surface contributes to an increase in refractive power from a portion suited for distant vision via a progression zone to a portion suited for near vision along a plane or curved main meridian, along which the overall astigmatism is .ltoreq.0.5 dpt.The invented opthalmic lens is distinguished in that in order to form further channels of vision, the at least one surface contributing to increasing the refractive power is provided with at least one additional line which does not intersect the main meridian and runs from the distant portion to the bottom edge of the ophthalmic lens and on which the surface astigmatism has a minimum local value.

Abstract: A progressive power ophthalmic lens having at least one surface contributing to an increase in power from a distant portion via a progressive zone to a reading portion, radii of curvature of horizontal section curves of the at least one surface contributing to an increase in power and having horizontal planes as a function of the distance from the main meridian decrease in a front surface in the region of the main meridian in the distant portion and increase in the rear surface in the distant portion and decrease in the reading portion, and the course of change of the curvature .DELTA.rh-rh(x,y)-rh (0,y) reverses with increasing distance x from the main meridian.

Abstract: An anti-reflection film for a clearly transparent optical element consisting of an organic material, for example an ophthalmic spectacle lens, is described. The anti-reflection film comprises a number of layers of which at least one consists of a metallic oxide. In one version of this invention, at least one layer consists of erbium oxide, terbium oxide, dysprosium oxide or holmium oxide. In another version of this invention, one layer consisting of samarium oxide, europium oxide, neodymium oxide or ytterbium oxide with a thickness of lambda/10 to lambda/20 is provided. In a third version of this invention, one layer consisting of yttrium oxide is deposited by evaporation on a layer of silicon dioxide, where the latter is deposited directly on the optical element consisting of an organic material.

Abstract: A mount for optical lens elements or the like, with a retaining ring arranged in a mount body and holding a lens element in the mount. To obtain uniform contact pressure in the lens element and avoid exertion of a torque during mounting of the retaining ring in the mount body, openings are provided along an outer peripheral zone of the retaining ring, with the openings penetrating in the preferably cylindrical peripheral surface of the retaining ring. Setscrews oriented parallel to the element axis are located in the openings to be rotatable and held toward the lens element. The setscrews enter into the mount body with their thread zone projecting out of the peripheral surface of the retaining ring.

Abstract: A spectacle lens for half-eye spectacles is described which in accordance with the present invention has at least one aspherical surface whose surface focal power increased progressively from the upper rim area of the spectacle lens towards the lens bottom.In a preferred version example, the spectacle lens has a prismatic power of zero in the upper rim area.In a further preferred version example, the power of the spectacle lens increases progressively from a value other than zero in the upper rim towards the lens bottom.

Abstract: A device for deviating a bundle of light rays into a plane comprises a deflecting prism of constant deviation rotatable about an axis. The deflecting prism is a Wollaston type quadrangular prism having two prism faces forming a right angle therebeween and having an axis of rotation oriented substantially perpendicularly to one of the two prism faces having the right angle therebetween.

Abstract: A uniform strength ophthalmic lens having a gradient refractive index changing rotational-symmetrically about the optical axis in which the curvature course of at least one of the two surfaces of the ophthalmic lens is selected without consideration of correction of aberration so that the critical thickness of the ophthalmic lens does not exceed a specific value and that the gradient refractive index is change rotational-symmetrically about the optical axis so as to correct the aberration. In this manner, a significant reduction of the critical thickness of the opthalmic lens, i.e., the center thickness is a positive lens and peripheral thickness in a negative lens, is achieved while providing an ophthalmic lens having good image-forming properties.

Abstract: A mount for an optical element such as a lens element wherein the optical element has a cylindrical circumferential rim and at least three ribs formed of a material having a highly elastic property. The ribs have a predetermined length and are disposed at a predetermined distance from one another along the cylindrical circumferential rim of the optical element with each rib having an inner periphery in continuous contact with an outer periphery of the cylindrical circumferential rim of the optical element. The ribs are compressed on assembly of the optical element into the mount so that centration of an optical system, e.g., the lens, is substantially improved.