Method and device for measuring an optical lens for individual wearing situations by a user
A device for measuring the optical effect of an ophthalmic lens, in particular a spectacle lens, includes a display system, an image acquisition system, and a computer unit. During measurement, the lens is arranged in a measurement volume of the device. The display system displays a test structure and the image acquisition system acquires image data of the test structure from multiple viewpoints using imaging optical paths which pass through the lens. The computer unit determines the three-dimensional shape of the lens on the basis of the image data and calculates an optical effect of the lens on the basis of its three-dimensional shape. A corresponding method and computer program are also disclosed.
1. An apparatus for measuring an optical effect of a spectacle lens arranged in a measurement volume, the apparatus comprising:
a display device configured to display a test structure;
an image capturing device configured to capture image data of the test structure from a plurality of viewpoints along respective imaging beam paths passing through a spectacle lens; and
a computing unit configured to:
determine a three-dimensional shape of the spectacle lens on a basis of the image data; and
calculate an optical effect of the spectacle lens on a basis of the three-dimensional shape of the spectacle lens for a specified wearing position of a user, which differs from a measurement position in which the image data are captured.
2. The apparatus as claimed in claim 1 , wherein the image capturing device further comprises:
a first camera configured to capture first image data from a first viewpoint; and
a second camera configured to capture second image data from a second viewpoint,
wherein the computing unit is configured to determine the three-dimensional shape of the spectacle lens on the basis of the first image data and the second image data.
3. The apparatus as claimed in claim 1 , wherein the computing unit is configured to iteratively determine the three-dimensional shape of the spectacle lens with an integration method.
4. The apparatus as claimed in claim 1 , wherein the computing unit is configured to determine the three-dimensional shape of the spectacle lens on a basis of back tracing the respective imaging beam paths entering the image capturing device.
5. The apparatus as claimed in claim 1 , wherein the computing unit is configured to determine the three-dimensional shape of the spectacle lens by dividing at least one of a front surface or a back surface of the spectacle lens into surface elements and to determine an alignment of the surface elements.
6. The apparatus as claimed in claim 5 , wherein the computing unit is configured to determine a three-dimensional shape of the front surface and the back surface of the spectacle lens on the basis of the alignment of the surface elements.
7. The apparatus as claimed in claim 1 , wherein the computing unit is configured to determine the three-dimensional shape of the spectacle lens taking account of a boundary condition that a front surface or a back surface of the lens has a parameterizable area.
8. The apparatus as claimed in claim 7 , wherein the parameterizable area includes a sphere, a section of the sphere, a torus, or a section of the torus.
9. The apparatus as claimed in claim 1 , wherein the computing unit is further configured to determine the three-dimensional shape of the spectacle lens taking account of one or more known contact points of the spectacle lens.
10. The apparatus as claimed in claim 1 , wherein the computing unit is configured to determine the three-dimensional shape of the spectacle lens taking account of a boundary condition, wherein the boundary condition is determined by reading information about the spectacle lens to be measured.
11. The apparatus as claimed in claim 10 , wherein the boundary condition is determined by reading a code on the spectacle lens.
12. The apparatus as claimed in claim 1 , wherein the computing unit is configured to determine a spatial refractive index distribution of the spectacle lens to be measured.
13. The apparatus as claimed in claim 1 , further comprising:
a height adjustment device configured to vary a distance between the image capturing device and the display device,
wherein the computing unit is further configured to determine, on the basis of image data captured from different distances between the image capturing device and the display device, a beam direction of light beams captured by the image capturing device.
14. An apparatus for measuring an optical effect of a spectacle lens arranged in a measurement volume, the apparatus comprising:
a display device configured to display a test structure;
an image capturing device configured to capture image data of the test structure from a plurality of viewpoints along respective imaging beam paths passing through a spectacle lens; and
a computing unit configured to:
assign an expected value for a position of the spectacle lens in a measurement volume based on a position of one or more known contact points of the spectacle lens;
determine the three-dimensional shape of the spectacle lens; and
calculate an optical effect of the spectacle lens on the basis of the three-dimensional shape of the spectacle lens.
15. An apparatus for measuring an optical effect of a spectacle lens arranged in a measurement volume, the apparatus comprising:
a display device configured to display a test structure;
an image capturing device configured to capture image data of the test structure from a plurality of viewpoints along respective imaging beam paths passing through a spectacle lens; and
a computing unit configured to:
read a code on the spectacle lens containing information about a boundary condition;
determine a three-dimensional shape of the spectacle lens on a basis of the image data and the boundary condition; and
calculate an optical effect of the spectacle lens on the basis of the three-dimensional shape of the spectacle lens.
16. A method for measuring an optical effect of a spectacle lens arranged in a measurement volume, the method comprising:
providing a test structure for display on a display device;
capturing image data of the test structure from a plurality of viewpoints along respective imaging beam paths passing through a spectacle lens;
determining a three-dimensional shape of the spectacle lens on the basis of the image data; and
calculating an optical effect of the spectacle lens on the basis of the three-dimensional shape of the spectacle lens for a specified wearing position of a user, which differs from a measurement position in which the image data are captured.
17. A method for measuring an optical effect of a spectacle lens arranged in a measurement volume, the method comprising:
providing a test structure for display on a display device;
capturing image data of the test structure from a plurality of viewpoints along respective imaging beam paths passing through a spectacle lens;
assigning an expected value for a position of the spectacle lens in the measurement volume to an algorithm based on a position of one or more known contact points of the spectacle lens;
determining a three-dimensional shape of the spectacle lens on the basis of image data taking account of the one or more known contact points of the spectacle lens; and
calculating an optical effect of the spectacle lens on the basis of the three-dimensional shape of the spectacle lens.
18. A method for measuring an optical effect of a spectacle lens arranged in a measurement volume, the method comprising:
providing a test structure for display on a display device;
capturing image data of the test structure from a plurality of viewpoints along respective imaging beam paths passing through a spectacle lens;
reading a code on the spectacle lens containing information about a boundary condition;
determining a three-dimensional shape of the spectacle lens on a basis of the image data and the boundary condition; and
calculating an optical effect of the spectacle lens on a basis of the three-dimensional shape of the spectacle lens.