Abstract: Method and device for precision adjustment of the beam direction of the light source of a device for aligning two objects relative to one another, the beam direction being moved by a motor via input elements of the computer of the alignment device.

Abstract: Method and device for precision adjustment of the beam direction of the light source of a device for aligning two objects relative to one another, the beam direction being moved by a motor via input elements of the computer of the alignment device.

Abstract: A progressive ophthalmic lens including at least one distant vision zone in which the power is suitable for distant viewing, at least one near vision zone in which the power is suitable for near viewing, and at least one progression zone in which the power varies continuously from the power of the distant vision zone to the power of the near vision zone along a principal line, at least one surface of the ophthalmic lens contributing to the power variation. A surface astigmatism of the at least one of surface of the ophthalmic lens contributing to the power variation along at least one horizontal intersection, represented by an intersection of the ophthalmic lens and a horizontal plane where y=const, has a local maximum value located at a distance of not more than 4 mm from the principal line, and at least one local minimum value which does not lie on the principal line and is located at a greater distance from the principal line than the local maximum value.

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: 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: 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: 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 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: 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 spectacle lens with a high positive refracting power, whose front surface has an aspheric, rotationally symmetric effective part. The effective part is configured in accordance with the following equation: ##EQU1## where z is the sagitta, h is the distance from the optical axis, C is determined by the desired refracting power of the front surface at the vertex, and K and I.sub.i are aspheric coefficients. The aspheric coefficients K and I.sub.i are determined so that either the visual acuity V is a maximum or .vertline..DELTA.R.vertline.+.vertline..DELTA.S.vertline. is a minimum. The lens produces a pattern of aberration which allows complete utilization of the visual field for dynamic vision.

Abstract: In the disclosed lens, one lens surface is divided into an upper distance-vision portion FT, a lower near-vision portion NT, and a varying or transitional region PB between the two other portions. In the upper distance-vision portion, the surface contains a far reference point B.sub.F and exhibits predetermined average distance-vision surface refractive powers D.sub.F. The lower near-vision portion contains a near-vision reference point B.sub.N and has predetermined average near-vision surface refractive powers D.sub.N. The transitional region exhibits average surface refractive powers D.sub.P which effect a smooth transition from the distance-vision portion to the near-vision portion. The surface is divided into a temporal portion and a nasal portion by a principal meridian M which forms an umbilical line.

Abstract: An eyeglass lens (ophthalmic lens) has in its upper section (far sight field) surface refraction values relative to far sight, and has in its lower section (near sight field) surface refraction values relative to near sight, and is divided into left and right sections by a line (main meridian), the points of which at least approximate geometric umbilical points (points of the same surface refraction value in the two main curvatures) in which a transition region (progression zone) is provided between the upper section and the lower section, in which the surface refraction values of the upper section change gradually into the surface refraction values of the lower section and in which all the lines of equal average refraction values of the upper section intersect the main meridian in the upper section and all the lines of the lower section intersect the main meridian in the lower section and all are extended on both ends to the periphery of the eyeglass lens.