摘要:
The invention relates to a method for automatically measuring at least one refractive characteristic of both eyes (OD, OG) of a person, said method comprising the following steps: a) adjusting at least one position of the head of the person, as desired by said person, in a reference system (O, X, Y, Z) connected to an image capture apparatus (10) that is set up so as to convert each captured image into a signal representing said image; b) illuminating both eyes (OD, OG) by means of at least one light source (20), the position of which is known within said reference system (O, X, Y, Z) connected to the image capture apparatus (10); c) measuring at least one sight direction parameter (H) connected to the sight direction of the person within a reference system connected to the head thereof; d) capturing, by means of said image capture apparatus (10), at least one retinal reflection image (IROD1, IROG1, IROD2, IROG2) from said light source (20) onto the retina of both eyes (OD, OG) of the person; f) determining, from said at least one captured image in Step d), said refractive characteristic (D) of the eyes (OD, OG) of the person; and h) storing the sight direction parameter (H) connected to the sight direction of the person that is measured in relation to the predetermined refractive characteristic during the image capture in Step c).
摘要:
A system and method for updating a generic ophthalmic lens design is described. The method comprises the steps of selecting a generic ophthalmic lens design from a generic ophthalmic lens design database and receiving, over a data-communication network, lens order data associated with at least one individual lens wearer. The method also includes the steps of creating, using the generic ophthalmic lens design and the lens order data, at least one customized ophthalmic lens design being customized for the respective at least one individual lens wearer and updating the generic ophthalmic lens design in the generic ophthalmic lens design database using the at least one customized ophthalmic lens design.
摘要:
A method for producing an ophthalmic glass (1) intended for an identified wearer of spectacles comprises distribution of an optical power addition between an anterior face (SANT) and a posterior face (SPOST) of said glass. Said distribution of the addition is done in such a way as to modify an optical characteristic as a function of relative amplitudes of eye and head movements of the wearer. Superior comfort of the glass in use is thus obtained. The optical characteristic which is considered may be, in particular, a variation of magnification procured by the glass between far and near vision conditions. An improvement of the invention is to also modify a design of the progressive glass as a function of the amplitudes of the eye and head movements of the wearer, using only a single semifinished glass model of fixed design for each addition value of the anterior face.
摘要:
A method for determining personalized near addition value for non-presbyopes, including measuring fusional amplitudes and phoria with at least one addition value, on both eyes of a person at a working distance; finding a mathematical function that predicts the change of a pair of fusional amplitudes and phoria as a function of addition value based on the addition value and the measured fusional amplitudes and phoria; and determining the near addition value according to a suitable relationship between the pair of fusional amplitudes and phoria on the mathematical function.
摘要:
The invention concerns a method for determining a progressive ophthalmic lens for a given user for whom a near vision power addition has been prescribed, including the following steps: measuring the lowering of the user's eyes and a vertical horopter of the wearer on a near-vision target point; measuring the user's near-vision head elevation and/or eye elevation; determining a coefficient of the user's near-vision vertical head movement (Ptvvp); determining a user-specific progression length (LP) defined by the relationship LP= H (1- Ptvyp), the progression length being defined as the eye-lowering angle between the mounting cross and the meridian point for which the power achieves the power addition; determining the lens by optimizing in optical computation in use conditions, using as the target a power variation along the meridian with a progression length equal to said user-specific progression length.
摘要:
The invention concerns a method for determining a progressive ophthalmic lens for a given user for whom a near vision power addition has been prescribed, including the following steps: measuring the lowering of the user's eyes and a vertical horopter of the wearer on a near-vision target point; measuring the user's near-vision head elevation and/or eye elevation; determining a coefficient of the user's near-vision vertical head movement (Ptvvp); determining a user-specific progression length (LP) defined by the relationship LP= H (1- Ptvyp), the progression length being defined as the eye-lowering angle between the mounting cross and the meridian point for which the power achieves the power addition; determining the lens by optimizing in optical computation in use conditions, using as the target a power variation along the meridian with a progression length equal to said user-specific progression length.
摘要:
The invention relates to a method for determining at least one optical design parameter for a progressive ophthalmic lens intended to be fitted in a frame chosen by a wearer, depending on the visual behaviour of the latter, comprising the following steps: a) the wearer is placed in a situation in which he carries out a visual task at a first working distance; b) during this visual task, at least two gaze directions of the wearer at this first working distance are determined in a frame of reference of the head of the wearer; c) a relative position of a surface related to said frame or to an ophthalmic lens intended to be fitted in said frame is determined in this frame of reference of the head of the wearer; d) for each gaze direction at the first working distance determined in step b) the intersection between this gaze direction at the first working distance and said surface is determined so as to establish a map of these points of intersection on this surface; and e) said sought-after optical design parameter is deduced from this map.
摘要:
The invention concerns a method for determining by optimization a set of progressive ophthalmic lenses for a given user for whom a near vision power addition (Addn) has been prescribed, including the following steps: measuring the user's near vision individual physiological parameters; determining a field of vision associating, on each lens, a target point in each viewing direction in use conditions; determining a target power defect and a resulting target astigmatism for each viewing direction under use conditions, the target power defect and the resulting target astigmatism being determined from the user's measured physiological parameters; computing the power required for each lens for said field of vision by successive iterations to reach the target power defect and the target astigmatism for each viewing direction.