Autofocusing eyewear, especially for presbyopia correction
AssigneeLight Prescriptions Innovators, LLC
InventorIlya Agurok
Life of this patent
Estimating the term…
Abstract
A pair of eyewear has transparent waveguides in each eyewear lens. An illumination subsystem directs a beam of light through the waveguides onto a wearer's eyes. A First Purkinje point imaging subsystem for each lens uses light reflected from the eyes through the waveguides. A controller calculates from the positions of the First Purkinje points the wearer's gaze parallax angle and/or the distance to an object of interest on which the gaze of the wearer's eyes converges. The output of the controller may drive variable-focus eyeglass lenses to enable a presbyopic wearer to focus on the object. Modified Alvarez variable-focus lenses are described.
Claims13
An eye parallax tracking system, comprising:
- a pair of eyewear with waveguides in each eyewear lens, said waveguides being transparent so as to permit a wearer to view an external scene directly;
- an illumination subsystem arranged to direct a beam of collimated light onto a wearer's eyes through said waveguides;
- a First Purkinje point imaging subsystem for each said lens using light from said illumination system reflected from said eyes through said waveguides;
- and a controller operative to calculate from the positions of the First Purkinje points of the wearer's eyes a quantity representative of at least one of the wearer's gaze parallax angle and the distance to an object of interest on which the gaze of the wearer's eyes converges.
An autofocusing eyewear combination with an eye parallax tracking system, comprising:
- a pair of eyewear with transparent waveguides in each eyewear lens;
- an illumination subsystem arranged to direct a beam of light through said waveguides onto a wearer's eyes;
- a First Purkinje point imaging subsystem for each said lens using light reflected from said eyes through said waveguides;
- a controller operative to calculate from the positions of the First Purkinje points of the wearer's eyes a quantity representative of at least one of the wearer's gaze parallax angle and the distance to an object of interest on which the gaze of the wearer's eyes converges;
- and
- variable-focus lenses, wherein the system controller gives a driving signal to the variable focus lenses based on said representative quantity;
- wherein the variable power lens is a modified Alvarez lens comprising two components of the form
- z=A*x*y2/s3+B*x3/s3+D*x/s,
- where z is a thickness of the component, x is a coordinate in a direction perpendicular to z in which the components are relatively movable to vary the power of the lens, y a coordinate in a direction perpendicular to x and z, and A, B, D, and s are coefficients and the absolute values of A, B, D, and s are not all the same for the two components.
Dependencies are inferred from the claim text.