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EP-3422086-B1 - METHOD FOR FILTER SELECTION

EP3422086B1EP 3422086 B1EP3422086 B1EP 3422086B1EP-3422086-B1

Inventors

  • DUBAIL, Marie
  • JOST, Sophie
  • CAUWERTS, Coralie

Dates

Publication Date
20260506
Application Date
20170630

Claims (12)

  1. A method implemented by computer means of selecting an optical filtration (110B, 401) of an ophthalmic device (100B, 400) for a wearer, wherein the ophthalmic device comprises a connection to a user interface and an electrically commanded cell, the method comprising: - obtaining wearer's preferences relatively to at least one predetermined type of visual environment defined by multispectral or hyper spectral data, through said computer means, wherein said wearer's preferences comprise data inputted by the wearer through said user interface when the wearer wears the ophthalmic device and is within a learning visual environment, and wherein said obtaining wearer's preferences comprises: - according to said learning visual environment, commanding the cell to apply a predetermined filter, - activating said user interface to receive from the wearer a choice input of keeping or adjusting the predetermined filter, - if said choice input is to keep said predetermined filter, then data of said predetermined filter are stored in association with data, comprising multispectral or hyper spectral data, acquired from the learning visual environment in a filter database assigned to said wearer, - if said choice input is to adjust said predetermined filter, said predetermined filter is modified according to the learning visual environment and the above operations are repeated with the thus adjusted filter as a new predetermined filter; - providing a filter database assigned to said wearer and storing data of prerecorded filters respectively associated with data, comprising multispectral or hyper spectral data, acquired from a plurality of learning visual environments, - selecting at least one filter through said computer means: * corresponding to said wearer's preferences relatively to said at least one predetermined type of visual environment, and * determined on the basis of said multispectral or hyper spectral data obtained from a visual environment of the wearer, wherein said selecting of at least one filter to be applied by the electrically commanded cell comprises: - comparing data, comprising multispectral or hyper spectral data, acquired from said least visual environment of the wearer successively to said data, comprising multispectral or hyper spectral data, acquired from the plurality of learning visual environments, - finding in the database the data acquired from a learning visual environment which is closest to said data acquired from said visual environment of the wearer, and - selecting from said database data of the prerecorded filter associated with said data of the learning visual environment which are the closest to said data acquired from said visual environment of the wearer; - commanding said electrically commanded cell to apply said selected filter through said computer means.
  2. The method according to claim 1, wherein said selecting of at least one filter takes into account the spectral sensitivity of the wearer.
  3. The method according to any of the precedent claims, wherein the method further comprises: - generating images representing said at least one predetermined type of visual environment of the wearer with said at least one filter applied; - receiving a wearer input to validate based on said generated images said at least one filter selected.
  4. The method according to claim 3, wherein said generated images are displayed on a RGB color display, and wherein said generated images are further based on spectral transmission of said at least one filter applied and on said multispectral or hyper spectral data.
  5. The method according to any of the precedent claims, wherein said multispectral or hyper spectral data is obtained by at least one sensor configured to sense environment light signal.
  6. The method according to claim 5, wherein said at least one sensor configured to sense environment light signal is embedded in an external device or in said ophthalmic device.
  7. The method according to claim 5, wherein said at least one sensor comprises a camera and said selecting of the at least one filter comprises a predetermined pattern recognition and a selection of an adapted filtration to be applied to images acquired by the camera comprising said predetermined pattern.
  8. The method according to any of the precedent claims, wherein said obtained wearer's preference are obtained in real time.
  9. The method according to any of the preceding claim, wherein said selecting of at least one filter is implemented by maximizing estimated performance parameters, and wherein said estimated performance parameters comprise at least one of color fidelity parameters and contrast parameters of said least one predetermined type of visual environment of the wearer.
  10. The method according to claim 5, wherein said at least one sensor comprising a camera to acquire at least one current image comprising a multiplicity of successive lines, light signal in each band of wavelength and in each line of said current image is measured to generate a matrix of spatial and spectral data corresponding to said multispectral and/or hyper spectral data.
  11. The method according to any one of the preceding claims, wherein said ophthalmic device comprises a wireless communication module arranged to communicate wirelessly with at least one wireless communication device.
  12. A system comprising an ophthalmic device (100B, 400) and computer means for selecting an optical filtration for a wearer, configured for implementing a method according to any one of the preceding claims.

Description

The present invention relates to optical filtration, and more specifically to a method of selecting an optical filtration of an ophthalmic device for a wearer in a visual environment, as well as to the system comprising an ophthalmic device and computer means for selecting the optical filtration. As a general rule, the choice to purchase an ophthalmic device such as spectacles for instance tends to be based on esthetic and fashion trend. Rarely wearers decide to invest in an ophthalmic device taking into account the color of a lens or any type of filter applied. In the case of an ophthalmic device comprising a solar lens, wearers would rather base their buying choices on the design of the frame of the ophthalmic device rather than the solar filter applied. Every wearer possesses different visual and physiological characteristics. Moreover, as every wearer is different, they may practice different activities. Such activity practice may vary in intensity and occurrence according to the wearer. For instance, on one hand, some wearer may spend most of their time indoor due to working constraint and on the other hand, some wearers may allocate their time to outdoor activities. As a consequence, such parameters as wearers' activities, preferences and characteristics may impact significantly the filter wearers may need and prefer. Furthermore, such parameters may also influence the evaluation of the benefits of the filter made by wearers. For instance, a wearer with an advanced age that may mostly work on a computer screen may require and appreciate a different filter from a young wearer practicing sports outdoor. Consequently, in order to provide a filter that may suits best a wearer, the knowledge regarding the wearer habits and preferences may be necessary. For this purpose, data relating to the environment of the wearer may provide excellent information to select a filter adapted to the wearer. Numerous ophthalmic devices comprising solar lens may be designed for dedicated activities. For instance, an ophthalmic device comprising a solar lens adapted to practice ski. However, such solar lens or filters applied are based on theoretical data. Document WO 2016/113506 A1 discloses a method for selecting an optical filtration of an ophthalmic device. Document WO 2014/174067 A1 discloses a computer-implemented method of selecting an optical filtration of an electronic ophthalmic device. Document WO 2016/077431 A1 discloses a method for determining the spectral properties of electrochromic filters for given environments. Therefore, such solutions have drawbacks. Indeed, as such ophthalmic device are based on theoretical data, they may not be adapted to wearer's activities, preferences and characteristics. Therefore there is a need to select a personalized filter, according to the habits, the environments, the preferences and the spectral sensitivity of the wearer. Such necessity may be express in a need for a method of selecting an optical filtration of an ophthalmic device for a wearer that takes into account wearer's preferences relatively to visual environments. The present invention aims to improve the situation. The invention relates to a method according to claim 1. Advantageous features are listed in dependent claims 2 to 11. The invention also relates to a system according to claim 12. The method is implemented by computer means of selecting an optical filtration of an ophthalmic device for a wearer, the method comprising: obtaining wearer's preferences relatively to at least one predetermined type of visual environment comprising multispectral or hyper spectral data;selecting at least one filter: * corresponding to said wearer's preferences relatively to said at least one predetermined type of visual environment, and* determined on the basis of said multispectral or hyper spectral data. It is meant by "multispectral or hyper spectral data" a set of data within specific wavelength ranges across the electromagnetic spectrum. It may be considered that multispectral data relates to at least three spectral bands up to fifteen spectral bands. Hyper spectral data may be considered to relate to hundreds of contiguous spectral bands. A "visual environment" designates any type of environment; examples may be a forest environment, an office environment, driving in day or night conditions. The visual environment may be indifferently designed here as a scene. The optical filtration method may result to any type of lens. For example, it may result to a solar lens or any other type of lens that are not necessarily solar lens. With such a method, the use of multispectral or hyper spectral data enables a quick acquisition of spectral information at each point of a visual environment. Such method relieves from constraints that relate to color gamut of the acquisition equipment. Obtaining multispectral data or hyper spectral data permits to take into account visual phenomena such as color constancy and metamerism. Spectral tra