Pulsed plus lens designs for myopia control, enhanced depth of focus and presbyopia correction
Ophthalmic lenses incorporate multifocal properties for the purpose of slowing, retarding, controlling or preventing myopia development or progression, correcting presbyopic vision or allowing extended depth of focus. The lens has electronically controlled adjustable focus where the change in focus oscillates so rapidly that it is imperceptible to human vision.
1. An ophthalmic lens system including circuitry for electronically oscillating focus of incoming light upon retina wherein the focus is modulated at a level that is imperceptible to a wearer of the lens while providing acceptable vision at near and far viewing distances, the ophthalmic lens system comprising: a first lens; a variable focus optic within the first lens, wherein the variable focus optic is configured to be tuned to achieve at least one focus state wherein incoming light is focused on a retina of a wearer to correct myopia or hyperopia of said wearer, and at least one defocus state wherein incoming light is focused in front of the retina to create myopic blur for said wearer to at least one of slowing, retarding, reversing or preventing myopia development or progression by temporally modulating a transmitted retinal image, or a portion thereof, in terms of power/focus in order to achieve a fleeting temporal defocus imperceptible to the brain while causing a change in eye growth due to the introduction of positive defocus in the retinal image while simultaneously providing acceptable vision at near and far viewing distances; a controller configured to control the variable focus optic and having a selectable duty cycle, the controller adapted to cause enabling the variable focus optic to alternate between the at least one focus state and the at least one defocus state at a rate sufficiently high to be imperceptible to the user, generate a series of wavefront patterns of both plus power and plano power alternatively displayed by the transmissive high speed tunable optics; and a power supply for energizing the variable focus optic and the controller.
2. The ophthalmic lens system according to claim 1 , wherein the at least one focus state achieves extended depth of focus.
3. The ophthalmic lens system according to claim 1 , further comprising first and second focal states, said first focus state correcting myopia and said second focus state correcting hyperopia wherein the focus is modulated to allow simultaneously good near and distance vision in presbyopic wearers.
4. The ophthalmic lens system according to claim 1 wherein the change in focus may vary from 0.50 Diopter to 20 Diopters.
5. The ophthalmic lens system according to claim 1 , wherein the rate of oscillation of focus is above the human critical flicker fusion frequency.
6. The ophthalmic lens system according to claim 1 , wherein the proportion of time for which the defocus state is presented to the wearer is from 1 percent to 75 percent.
7. The ophthalmic lens system according to claim 1 , wherein the variable focus optic comprises a liquid crystal insert.
8. The ophthalmic lens system according to claim 1 , wherein the variable focus optic comprises a liquid meniscus insert.
9. The ophthalmic lens system according to claim 1 , wherein 90 percent of the change in focus within the first lens occurs in less than 20 ms.
10. The ophthalmic lens system according to claim 1 , wherein the degree of change in focus may vary across the first lens.
11. The ophthalmic lens system according to claim 1 , wherein the first lens is an electronic contact lens.
12. The ophthalmic lens system according to claim 1 , wherein the first lens is an electronic spectacle lens.
13. The ophthalmic lens system according to claim 1 , wherein the first lens is an electronic intraocular lens.
14. The ophthalmic lens system according to claim 1 , further comprising a second lens having an independent variable focus optic configured to operate at least one of independently, synchronously, or synergistically relative to the first lens.
15. The ophthalmic lens system according to claim 1 , wherein 90 percent of the change in focus within the first lens occurs in less than 10 ms.
16. An ophthalmic lens system for treating myopia progression in a patient comprising a first lens to be worn in front of, on or implanted in an eye; a variable focus optic within the lens, wherein the variable focus optic is configured to be tuned to achieve at least one focus state wherein incoming light is focused on a retina of a wearer to correct myopia or hyperopia of said user, and at least one defocus state wherein incoming light is focused in front of the retina to create myopic blur for said wearer to at least one of slowing, retarding, reversing or preventing myopia development or progression by temporally modulating a transmitted retinal image, or a portion thereof, in terms of power/focus in order to achieve a fleeting temporal defocus imperceptible to the brain while causing a change in eye growth due to the introduction of positive defocus in the retinal image while simultaneously providing acceptable vision at near and far viewing distances; a controller in electrical communication with the variable focus optic configured adapted to cause enabling the variable focus optic to alternate between the at least one focus state and the at least one defocus state at a rate sufficiently high to be imperceptible to the user, wherein the controller has to control the variable focus optic and having a selectable duty cycle wherein said duty cycle includes imperceptible pulses of defocus having a duty cycle ranging from 5 to 90 percent, the controller enabling the variable focus optic to generate a series of wavefront patterns of both plus power and plano power alternatively displayed by the transmissive high speed tunable optics; and a power supply for energizing the variable focus optic and the controller.
17. The ophthalmic lens system according to claim 16 wherein the duty cycle ranges from 10 to 30 percent.
18. The ophthalmic lens system according to claim 16 wherein a change in visual acuity is approximately 0.4 or less in logMAR units.
19. The ophthalmic lens system according to claim 16 wherein a change in Weber contrast sensitivity is 0.15 or less.
20. The ophthalmic lens system according to claim 16 wherein a change in visual acuity is approximately 0.4 or less in logMAR units as compared to baseline and a change in Weber contrast sensitivity is 0.15 or less.
21. The ophthalmic lens system according to claim 16 wherein the value of the percent duty cycle multiplied by a defocus plus power ranges from 5 to 100 Percent*Diopter.