Abstract: The invention relates to a method for determining the location of the ocular pivot point (ADL) in an eye (10) of a test person. In the method, the mean curvature (KH) of the cornea (14) of the eye (10) is determined. The mean phase error (PF) of the eye (10) is determined as is the eye length (LA) from the mean curvature (KH) and the mean phase error (PF). The location of the ocular pivot point (ADL) is determined from the eye length (LA).

Abstract: The current invention is directed to a method for designing an ophthalmic lens element, the method comprising the steps of determining a wavefront aberration of an eye in a reference plane, wherein the wavefront aberration of the eye can be described by a first series of polynomials of ascending order up to a first specific order and corresponding first coefficients; and determining a first vision correction of a second specific order to obtain an adapted ophthalmic lens element; determining at least one specified point over an aperture of the adapted ophthalmic lens element; determining a high-order wavefront aberration in the reference plane for each specified point of the adapted ophthalmic lens element, wherein the high-order wavefront aberration can be described by a third series of polynomials of ascending order above the second specific order up to and including the first specific order and corresponding third coefficients; determining a second vision correction of the second specific order for each of

Abstract: An optical observation instrument, in particular a spectacle, a reading aid or a telescope, comprises an optical element, in particular a spectacle lens, adapted to be controllably adjustable in its refractive power, a sensor, and a control unit for adjusting the refractive power as a function of signals from the sensor. The sensor is a brightness sensor. In a method of controllably adjusting a refractive power of an optical element in an optical observation instrument an optical parameter is captured by means of a sensor and the refractive power is adjusted as a function of a signal from the sensor. By means of the sensor the brightness of the light impinging on the optical instrument is captured.

Abstract: A method and an apparatus serve for checking the centering of spectacles worn by a spectacle wearer. The method comprises the steps of: a) measuring spectacle lenses mounted in a frame of the spectacles, wherein a position of permanent markings on the spectacle lenses is acquired relative to a coordinate system defined by the frame by means of an image recognition system; b) determining positions of nominal centering points, prescribed in a file, of the spectacle lenses in dependence on data of the spectacle lenses containing the position of the permanent markings; c) measuring physiological data of a spectacle wearer wearing the spectacles and determining positions of actual centering points of the spectacle lenses from the physiological data by means of a video centering instrument; d) determining the difference between the positions of the nominal centering points and the actual centering points; and e) comparing the difference to a prescribed difference threshold.

Abstract: The invention is directed to a method for determining the individually required addition (Add) of a vision assist for an eye, the method having the following steps: a) a preliminary addition (Addpreliminary) is determined; b) the depth of field (T) of the eye is individually determined; and, c) the addition (Add) is computed according to the following equation: Add=Addpreliminary??T; wherein ? defines a real number which lies in the range 0<??1. The invention is further directed to a corresponding arrangement for carrying out the method as well as a computer program.

Abstract: The invention is directed to a method for determining the individually required addition (Add) of a vision assist for an eye, the method having the following steps: a) a preliminary addition (Addpreliminary) is determined; b) the depth of field (T) of the eye is individually determined; and, c) the addition (Add) is computed according to the following equation: Add=Addpreliminary??T; wherein ? defines a real number which lies in the range 0<s?1. The invention is further directed to a corresponding arrangement for carrying out the method as well as a computer program.

Abstract: Methods for dispensing eyeglasses are disclosed. The methods involve making a subjective refraction and an objective refraction and sending the information to a calculation computer to combine both refractions to calculate the person's prescription. The person's prescription is subsequently sent to a manufacturing location separate from the calculation computer for manufacture of the lenses.

Abstract: The disclosure relates to a method for determining an eyeglass prescription for a vision defect of an eye. In certain embodiments, the method includes optimizing a caustic in the area of the retina of the eye for a light ray passing through the eyeglass prescription and the eye. The disclosure further relates to an apparatus that is suitable for carrying out the method.

Abstract: An optical observation instrument, in particular a spectacle, a reading aid or a telescope, comprises an optical element, in particular a spectacle lens, adapted to be controllably adjustable in its refractive power, a sensor, and a control unit for adjusting the refractive power as a function of signals from the sensor. The sensor is a brightness sensor. In a method of controllably adjusting a refractive power of an optical element in an optical observation instrument an optical parameter is captured by means of a sensor and the refractive power is adjusted as a function of a signal from the sensor. By means of the sensor the brightness of the light impinging on the optical instrument is captured.

Abstract: A method and an apparatus for testing night vision are disclosed. At least one visual mark is presented to a test person having an open pupil from a distance of several meters. The visual mark is configured as a light point, and a visual impression of the test person is determined by means of the visual mark. The apparatus comprises means for opening a pupil of a test person, in particular a darkened room. An examination position for the test person and a presentation apparatus for visual marks arranged at a distance of several meters from the examination position are also provided. The presentation apparatus comprises at least one point-shaped light source. A light beam thereof is directed towards the examination position. Means are provided for determining a visual impression of the test person with the help of the visual marks.

Abstract: In general, in some embodiments, the disclosure provides a method that includes making a subjective refraction of a person to determine information about the person's vision, making a wavefront measurement of one or both of the person's eyes to determine information about the optical properties of one or both of the person's eyes (e.g., aberrations), calculating a prescription for the person based on the information about the person's vision and the information about the optical properties of one or both of the person's eyes, and outputting the prescription.