Abstract: Methods for optimizing postural prism to be added to a pair of ophthalmic multifocal lenses (lenses) adapted to a wearer and to slow down myopia progression are described. The method includes an initial pair of lenses in a providing step S1. In a postural prism adding step S2, a same postural prism is added to each lens. In a gazing step S3, the wearer gazes at a first distance target through the lenses with the added postural prism. A gazing direction determining step S4 determines the wearer's gazing direction during S3. Steps S2 to S4 may be repeated while changing the added postural prism, wherein the added postural prism is smaller than or equal to a maximum prism value. Steps S2 to S4 may be repeated to determine the smallest added postural prism for which the wearer's gazing direction in step S4 passes through the first vision zone.

Abstract: An optical system having a transmission pattern comprising at least a first zone Z1 extending from at or about 380 nm to a first limit L1 between Z1, and a second zone Z2. A third zone Z3 extends from a second limit L2 between Z2 and Z3 to about 780 nm. L1 may be greater than or equal to or about 436 nm. Second limit L2 may be greater than L1 and smaller than or equal to or about 487 nm. The average transmission values T1, T2, T3, in each zone Z1, Z2, Z3 may be: T2>5*(T1+T3)/2, with T1 the average transmission over Z1, T2 the average transmission over Z2, T3 the average transmission over Z3. T1 and T3 may be greater than or equal to or about 3% and smaller than or equal to or about 70%. T2 may be greater than or equal to or about 75%.

Abstract: The invention relates to a method for characterizing a perception of blur by a subject (10) in order to determine a dioptric blur value for an image (C) observed by the subject. The image has a blur generated by the low-pass filtering of the image components in accordance with the respective space frequencies of said image components. An indication of the perception thereof of blur in the image is provided by the subject and is associated with the dioptric blur value. Several images associated with different dioptric blur values are used for defining a dioptric blur threshold value for the subject that corresponds to a blur perception criterion. The invention can be used for adjusting the design of a progressive lens for the subject in accordance with the sensitivity to said visual blur of said object.

Abstract: 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 includes the following steps: measuring the user's near vision individual physiological parameters; determining an ergorama associating, on each lens, a target point in each look direction in worn conditions; determining a target power defect and a resulting target astigmatism for each direction of look under worn 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 ergorama by successive iterations to reach the target power defect and the target astigmatism for each look direction.

Abstract: A method for automatically measuring at least one refractive characteristic of both eyes of a person, includes: a) adjusting at least one position of a person's head, in a reference system connected to an image capture apparatus set up to convert each captured image into a signal representing the image; b) illuminating both eyes with at least one light source, whose position is known within the reference system; c) measuring at least one sight direction parameter connected to the sight direction of the person within a reference system connected to the head thereof; d) capturing at least one retinal reflection image from the light source onto the retina of both eyes; f) determining, from the captured image in Step d), the refractive characteristic of the eyes; and h) storing the sight direction parameter in relation to the predetermined refractive characteristic during the image capture in Step c).

Abstract: A method for producing an ophthalmic spectacle lens makes it possible to fit out a wearer of lenses in a manner which is customized as a function of a perception of blur by said wearer. The lens is selected so that the wearer has the impression of having a field of sharp vision which has a reference width. This reference width is determined on the basis of a first lens which complies with the wearer's ophthalmic prescription and a reference threshold value of the blur. It is thereafter associated within the lens which is provided for the wearer with a threshold value of the blur which is perceived by this wearer.

Abstract: The invention relates to the making of a progressive spectacle lens for customizing the lens based on the blur perception by a future lens wearer. Accordingly, a blur threshold value is determined for the wearer according to a blur perception criterion that varies based on an optical-power addition value prescribed for the wearer. The blur threshold value is associated with a reference sight direction for the lens provided to the wearer.

Abstract: A series of progressive ophthalmic lenses is proposed, which is indexed by optical power addition values of eyeglasses of spectacles to be made from these lenses. Each lens of the series determines a further gap between a value of the optical power for the near vision direction and a maximum value of the optical power which is obtained for a direction of gaze pointing below said near vision direction. The lenses of the series are adapted for postures of wearers that may vary as a function of the optical power addition values.

Abstract: A method for automatically measuring at least one refractive characteristic of both eyes of a person, includes: a) adjusting at least one position of a person's head, in a reference system connected to an image capture apparatus set up to convert each captured image into a signal representing the image; b) illuminating both eyes with at least one light source, whose position is known within the reference system; c) measuring at least one sight direction parameter connected to the sight direction of the person within a reference system connected to the head thereof; d) capturing at least one retinal reflection image from the light source onto the retina of both eyes; f) determining, from the captured image in Step d), the refractive characteristic of the eyes; and h) storing the sight direction parameter in relation to the predetermined refractive characteristic during the image capture in Step c).

Abstract: The invention relates to a method for producing a novel progressive glasses lens intended for a presbyopic wearer, which takes into account the postural habits of the wearer, acquired through prior conditions of ophthalmic correction. A design for the novel progressive lens is established by modifying a reference lens in compliance with an aptitude of the wearer to modify his/her postural habits. To this end, variations in a postural parameter are determined using measurements of said parameter, which are carried out on the wearer. The invention enables the reduction of a period of habituation by the wearer to the novel progressive glasses lens.

Abstract: The invention relates to a method for characterizing a perception of blur by a subject (10) in order to determine a dioptric blur value for an image (C) observed by the subject. The image has a blur generated by the low-pass filtering of the image components in accordance with the respective space frequencies of said image components. An indication of the perception thereof of blur in the image is provided by the subject and is associated with the dioptric blur value. Several images associated with different dioptric blur values are used for defining a dioptric blur threshold value for the subject that corresponds to a blur perception criterion. The invention can be used for adjusting the design of a progressive lens for the subject in accordance with the sensitivity to said visual blur of said object.

Abstract: A progressive ophthalmic lens for the correction of myopia, that comprises an upper area in which the correction is adapted for peripheral vision of the wearer. Such a lens reduces the risk of long term worsening of myopia for the lens wearer by reducing the defocalisation of an image formed on the retina outside the foveolar area. Also disclosed is a method for making such a lens. According to one improvement, the correction of myopia for the peripheral vision in the upper area of the lens is further adjusted based on a tendency of the wearer to turn the eyes or the head for watching an eccentric object.

Abstract: The invention relates to the making of a progressive spectacle lens for customizing the lens based on the blur perception by a future lens wearer. Accordingly, a blur threshold value is determined for the wearer according to a blur perception criterion that varies based on an optical-power addition value prescribed for the wearer. The blur threshold value is associated with a reference sight direction for the lens provided to the wearer.

Abstract: A multifocal ophthalmic eyeglass (1) corrects a wearer's vision for a first vision distance in a principal vision zone (10) of the eyeglass, and for at least two different second vision distances in a secondary vision zone (20) of said eyeglass. For this purpose, the secondary vision zone is divided into at least two series of alternating regions, each producing an ophthalmic correction suitable for one of the second vision distances. A presbyopic wearer provided with such an eyeglass can both read a book and view an obstacle on the ground equally well, for the same direction of his gaze through the secondary vision zone.

Abstract: 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.

Abstract: The invention relates to a method for making an ophthalmic member for correcting ametropia, that is adapted for correcting the central and peripheral vision of a wearer and takes into account the amplitudes of the movements of the wearer's eyes and head. A central area of the member, in which the central vision is corrected, is sized based on the amplitude of the eyes' movements in order to provide good visual comfort. The peripheral vision is corrected in a peripheral area of the ophthalmic member in order to prevent an increase of the wearer's ametropia in the long run.

Abstract: 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 includes the following steps: measuring the user's near vision individual physiological parameters; determining an ergorama associating, on each lens, a target point in each look direction in worn conditions; determining a target power defect and a resulting target astigmatism for each direction of look under worn 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 ergorama by successive iterations to reach the target power defect and the target astigmatism for each look direction.

Abstract: 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 includes the following steps: measuring the user's near vision individual physiological parameters; determining an ergorama associating, on each lens, a target point in each look direction in worn conditions; determining a target power defect and a resulting target astigmatism for each direction of look under worn 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 ergorama by successive iterations to reach the target power defect and the target astigmatism for each look direction.

Abstract: A series of progressive ophthalmic lenses is proposed, which is indexed by optical power addition values of eyeglasses of spectacles to be made from these lenses. Each lens of the series determines a further gap between a value of the optical power for the near vision direction and a maximum value of the optical power which is obtained for a direction of gaze pointing below said near vision direction. The lenses of the series are adapted for postures of wearers that may vary as a function of the optical power addition values.

Abstract: An ophthalmic eyeglass (1) is adapted for correcting both the foveal vision and the peripheral vision of a wearer. An image portion formed in the foveal zone of the wearer's retina is thus sharp, at the same time as another image portion is also sharp, which is formed on the retina away from the foveal zone, by light rays that are oblique to the line of sight of the wearer. To this purpose, the eyeglass comprises a central zone (10) and first (21) and second (22) regions that alternate in a peripheral zone (20) of said eyeglass. First parameters of the eyeglass in the central zone and in the first regions are adapted so as to correct the foveal vision of the wearer and second parameters of the eyeglass in the second regions are adapted for correcting the peripheral vision of said wearer.