Method and system for determining an adaptive parameter for a spectacle lens accommodated in a spectacle frame

Patent metadata

Field	Value
Publication number	US-2016357032-A1
Application number	US-201615212060-A
Country	US
Kind code	A1
Filing date	Jul 15, 2016
Priority date	Jan 15, 2014
Publication date	Dec 8, 2016
Grant date	—

Abstract

In a method for determining at least one fitting parameter for a spectacle lens received in a spectacle frame, an image, lying in an image plane, of at least one portion of a spectacle frame worn by a subject is acquired. When acquiring the image, the inclination of the image plane about a horizontal axis which is parallel to the image plane is established and, in the process, the at least one fitting parameter is established from the acquired image of the portion of the subject with the spectacle frame worn by the subject and the established inclination of the image.

First claim

What is claimed is:

1 . A method for determining an adaptative parameter for a spectacle lens accommodated in a spectacle frame, the method comprising the steps of:
providing a camera defining an optical axis and at least three front target marks spatially fixed relative to said spectacle frame and arranged on a measurement bracket defining a front side with a first one of said front target marks being spatially offset perpendicularly to said front side with respect to the second and third ones of said front target marks; with said camera, capturing an image lying in an image plane of a section of said spectacle frame worn by a patient together with said three front target marks; determining an inclination angle (y) of said image plane about a horizontal axis parallel to said image plane; determining the position of said front target marks in the captured image utilizing image analysis; determining a forward inclination angle of said spectacle frame from said position of said front target marks determined from said image analysis; correcting said forward inclination angle to a corrected forward inclination angle (α) in correspondence to said determined inclination angle (γ) of said image plane; determining a head rotation angle of the head of said patient with respect to said optical axis of said camera; correcting said head rotation angle to a corrected head rotation angle (β) corrected in correspondence to a horizontal alignment of said optical axis of said camera; and, with image analysis, determining at least one adaptive parameter from the captured image of the section of the spectacle frame worn by said patient and said corrected forward inclination angle (α) as well as said corrected head rotation angle.

2 . The method of claim 1 , wherein said image is captured with a digital camera incorporating an inclination sensor capturing the inclination of said image plane about a horizontal axis.

3 . The method of claim 1 , comprising the further step of: capturing said section of said spectacle frame worn by the patient when said measurement bracket is connected to said spectacle frame wherein said front side of said measurement bracket accommodates said three front target marks for a measurement of said forward inclination angle (α) of said spectacle frame to be measured wherein said first front target mark is arranged spatially offset perpendicular to said forward side of said measurement bracket relative to said second and third front target mark.

4 . The method of claim 1 , wherein said adaptive parameter is selected from the group comprising frame measure (l, h, AzG), pupillary distances (PD, z R , z L ), centerpoint spacing (x R , y R , x L , y L ), cornea vertex spacing (HSA), frame forward inclination, frame disc angle and required raw glass diameter.

5 . A system for determining an adaptive parameter for a spectacle lens accommodated in a spectacle frame, the system comprising:
a camera having an image plane; an inclination sensor detecting the inclination of said image plane of said camera about a horizontal axis; a computer unit incorporating a computer program for determining said adaptive parameter from an image of a section of said spectacle frame worn by a patient and the determined inclination of said image wherein said image is captured by said camera; and, said computer being configured to determine said adaptive parameter in accordance with a method including the steps of: providing a camera defining an optical axis and at least three front target marks spatially fixed relative to said spectacle frame and arranged on a measurement bracket defining a front side with a first one of said front target marks being spatially offset perpendicularly to said front side with respect to the second and third ones of said front target marks; with said camera, capturing an image lying in an image plane of a section of said spectacle frame worn by a patient together with said three front target marks; determining an inclination angle (y) of said image plane about a horizontal axis parallel to said image plane; determining the position of said front target marks in the captured image utilizing image analysis; determining a forward inclination angle of said spectacle frame from said position of said front target marks determined from said image analysis; correcting said forward inclination angle to a corrected forward inclination angle (α) in correspondence to said determined inclination angle (γ) of said image plane; determining a head rotation angle of the head of said patient with respect to said optical axis of said camera; correcting said head rotation angle to a corrected head rotation angle (β) corrected in correspondence to a horizontal alignment of said optical axis of said camera; and, with image analysis, determining at least one adaptive parameter from the captured image of the section of the spectacle frame worn by said patient and said corrected forward inclination angle (α) as well as said corrected head rotation angle.

6 . The system of claim 5 , wherein said camera is integrated into a tablet computer and/or is integrated into a mobile telephone and said computer unit is configured as a server connected to said tablet computer and/or said mobile telephone.

7 . The system of claim 6 , wherein said tablet computer and/or said mobile telephone communicate wirelessly with said server.

8 . A computer program having a program code configured for carrying out the method steps set forth in claim 1 when said computer program is carried out in the computer unit of the system configured in accordance with claim 5 .

Assignees

• Zeiss Carl Vision Int Gmbh

Inventors

• Cabeza-Guillen Jesus-Miguel
• Mani Subhashini
• Gamperling Michael

Classifications

• G02C13/005 Primary

  Measuring geometric parameters required to locate ophtalmic lenses in spectacles frames (apparatus for testing or instruments for examining the eyes per se A61B3/00; machines or devices and accessories for grinding the edges of lenses using spectacles as a template B24B9/144) · CPC title

• A61B3/0025

  characterised by electronic signal processing, e.g. eye models · CPC title

• A61B3/111

  for measuring interpupillary distance · CPC title