Apparatus for determining the distance between pupils
First Claim
1. An apparatus for determining the distance between the pupils for defining precisely the parameters relevant to grinding spectacle lenses for the alignment of optical lenses in a spectacle frame, as an integral component of a video centering system provided with a camera (2), a zooming device (3), a computer (4) with a monitor (5) and a calibration device (1) in which the size (OG) of the subject is presented by indicia (A;
- B) on the calibration device (1) disposed in the plane of the spectacle lens of the spectacle socket to be measured, the indicia (A;
B) being detected by the camera (2) and transmitted to the computer (4) for determining the actual value of the shooting distance (AE) which forms the basis for the value of the position (P) of the distance between the pupils.
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Accused Products
Abstract
An apparatus for determining the distance between the pupils to yield values representative of lenses properly aligned with the patient'"'"'s pupils when mounted in the sockets of a spectacle frame. The apparatus consists of a calibration device having spaced fixed marking for placement in the plane of lenses, a camera with a zooming arrangement for taking an image of the subject, and a computer for generating parametric values relevant to the lenses to be ground as a function of the distance between the camera and the subject, the position of the zooming device at the time the image is taken, and the size of the image on the focal plane of the camera.
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Citations
3 Claims
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1. An apparatus for determining the distance between the pupils for defining precisely the parameters relevant to grinding spectacle lenses for the alignment of optical lenses in a spectacle frame, as an integral component of a video centering system provided with a camera (2), a zooming device (3), a computer (4) with a monitor (5) and a calibration device (1) in which the size (OG) of the subject is presented by indicia (A;
- B) on the calibration device (1) disposed in the plane of the spectacle lens of the spectacle socket to be measured, the indicia (A;
B) being detected by the camera (2) and transmitted to the computer (4) for determining the actual value of the shooting distance (AE) which forms the basis for the value of the position (P) of the distance between the pupils. - View Dependent Claims (2, 3)
- B) on the calibration device (1) disposed in the plane of the spectacle lens of the spectacle socket to be measured, the indicia (A;
Specification