US 10,890,786 B2
Method and system for determining an adaptive parameter for a spectacle lens accommodated in a spectacle frame
Jesus-Miguel Cabeza-Guillen, Aalen (DE); Subhashini Mani, Aalen (DE); and Michael Gamperling, Leipheim (DE)
Assigned to Carl Zeiss Vision International GmbH, Aalen (DE)
Filed by Carl Zeiss Vision International GmbH, Aalen (DE)
Filed on Jul. 15, 2016, as Appl. No. 15/212,060.
Application 15/212,060 is a continuation of application No. PCT/EP2015/050554, filed on Jan. 14, 2015.
Claims priority of application No. 10 2014 200 637 (DE), filed on Jan. 15, 2014.
Prior Publication US 2016/0357032 A1, Dec. 8, 2016
Int. Cl. G02C 13/00 (2006.01); A61B 3/00 (2006.01); A61B 3/11 (2006.01)
CPC G02C 13/005 (2013.01) [A61B 3/0025 (2013.01); A61B 3/111 (2013.01)] 11 Claims
OG exemplary drawing
 
1. A method for determining an adaptive parameter for a spectacle lens accommodated in a spectacle frame with a system including a processor, program code stored on a non-transitory computer readable medium configured to perform method steps when executed by the processor, the system further including an inclination sensor, a handheld 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, the method comprising the steps of:
with said handheld 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 with the patient assuming a pose wherein the patient need not look into the camera;
determining an inclination angle (γ) of said image plane about a horizontal axis parallel to said image plane via said inclination sensor;
determining the position of said front target marks in the captured image utilizing image analysis performed by said program code when executed by the processor;
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 relation to a vertical direction in correspondence to said determined inclination angle (γ) of said image plane;
determining a head rotation angle (β) of the head of said patient with respect to said optical axis of said handheld camera with said head rotation angle (β) being conjointly defined by said optical axis and a plane running perpendicularly to a distance line between the pupils of the eyes of said patient;
correcting said head rotation angle (β) to a corrected head rotation angle corrected in correspondence to a horizontal alignment of said optical axis of said handheld camera; and,
determining at least one adaptive parameter for fitting the spectacle lens in the spectacle frame so as to cause an optical center of the spectacle lens to coincide with a visual axis of an eye of the patient 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 via image analysis performed by said program code when executed by the processor.