Automated lensometer
First Claim
Patent Images
1. A lensometer for measuring refractive power parameters of an eyeglass or contact lens including spherical refractive power, cylindrical refractive power, and prism power, comprising:
- means for holding the lens in a fixed position relative to an axis;
means for projecting a pattern of light sources generally along the axis through the lens from a first distance relative to the lens, and through the lens from a second distance relative to the lens;
means for capturing images of the pattern of lights projected from the first and second distances; and
means for analyzing the images and deriving the refractive parameters from a comparison of the images.
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Abstract
An automated lensometer including a mounting device to support and center a lens to be tested along an axis. First and second arrays of light source patterns are positioned at different optical distances from the mounted lens and are projected along the axis through the lens. The images of the projected patterns are captured and stored in a camera imaging device located along the axis. A comparison of the patterns by a processor allows derivation of refractive power of the lens.
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Citations
26 Claims
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1. A lensometer for measuring refractive power parameters of an eyeglass or contact lens including spherical refractive power, cylindrical refractive power, and prism power, comprising:
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means for holding the lens in a fixed position relative to an axis; means for projecting a pattern of light sources generally along the axis through the lens from a first distance relative to the lens, and through the lens from a second distance relative to the lens; means for capturing images of the pattern of lights projected from the first and second distances; and means for analyzing the images and deriving the refractive parameters from a comparison of the images. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
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15. An automated lensometer for the measurement of properties of optical lenses for glasses and contacts comprising:
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a base means for positioning the lensometer means on a surface; an upwardly extending arm means connected to the base means; a camera means mounted to the arm means; a projector means mounted to the arm means between the base means and the camera means; a lens holding means associated with the arm means and located between the projector means and camera means, which are aligned along an axis; the lens holding means releasably holding the lens along the axis; the projector means including first and second arrays of light source means, each light source means located a fixed but different distance from a lens held in the lens holding means; and processor means for measuring properties of the lens from differences in images from the light source means. - View Dependent Claims (16, 17, 18, 19, 20, 21, 22, 23, 24, 25)
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26. A method of measuring optical properties of eyeglass and contact lenses comprising:
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positioning a lens along an axis; positioning the optical center of the lens along the axis; projecting a geometric pattern of light sources through the lens along the axle; capturing the geometric pattern and recording the pattern; determining the geometric center of each light source and the relationship of each geometric center to one another; storing that information in a storage means; projecting a second pattern of light sources through lens, but along a different and longer optical path from the first projected array of light sources; capturing the second projected geometric pattern of light sources; determining the geometric center of each light source and with respect to one another; storing that information in a storage means; comparing the stored information of both projected geometric patterns, calculating the distance between geometric centers of corresponding light spots; and computing the optical properties of the lens from the comparison.
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Specification