Methods for the treatment of refractive error using active stimulation
Systems, devices, apparatuses and methods for an active projection system that may be incorporated into spectacles, contact lenses or provided as an add-on layer to existing spectacles or lenses. The active projection system operates to generate a stimulus or stimuli for viewing by a person's eye. The stimulus or stimuli creates an image that is defocused in front of the person's retina and can assist in slowing or stopping the progression of myopia or other refractive errors in the person.
1. A method of correcting refractive error of an eye, comprising:
generating a stimulus by operating a plurality of projection modules arranged around a periphery of an optic, wherein each of the plurality of projection modules operates to generate and direct light to form the stimulus; and
forming an image of the stimulus anterior or posterior to a peripheral region of a retina of the eye by directing light from the plurality of projection modules to a plurality of optical elements arranged on the optic, wherein the plurality of optical elements receives the light from the plurality of projection modules and directs the received light to form the image of the stimulus, wherein each of the plurality of projection modules further comprises: circuitry operative to activate a source of illumination in response to a control signal from a processor; a stimulus forming element arranged to form the stimulus when illuminated by the source of illumination; and a guide element to direct light from the stimulus forming element to at least one of the plurality of optical elements.
2. The method of claim 1 , wherein the optic comprises a lens.
3. The method of claim 1 , wherein the optic comprises a film or layer that is applied to a lens.
4. The method of claim 2 , wherein the lens comprises a contact lens or a lens of a pair of spectacles.
5. The method of claim 1 , wherein the source of illumination comprises one or more of a LED, OLED, a phosphorescent LED or a plurality of LEDs.
6. The method of claim 1 , wherein the stimulus forming element comprises a mask or reticle.
7. The method of claim 1 , wherein the formed image of the stimulus comprises an illuminated cross on a dark background.
8. The method of claim 1 , wherein the guide element comprises a lightguide.
9. The method of claim 8 , wherein the lightguide comprises: a light channel configured to transmit light; a reflective element to redirect the transmitted light to form the image; and a focusing element arranged to receive the redirected light and to project the redirected light toward at least one of the plurality of optical elements.
10. The method of claim 9 , wherein the focusing element comprises one or more lenses.
11. The method of claim 1 , wherein each of the plurality of optical elements comprises one or more of a mirror or mirrors, a partial mirror or partial mirrors, or a lightguide.
12. The method of claim 1 , wherein the optic comprises a lens and each of the guide elements directs the light to a facet of the lens, and further, wherein the facet directs the light to at least one of the plurality of optical elements.
13. The method of claim 1 , wherein the optic comprises a lens of a pair of spectacles and wherein the method further comprises supporting each of the plurality of projection modules by a frame of the spectacles.
14. The method of claim 1 , wherein the optic comprises a film or layer that is applied to a lens.
15. The method of claim 1 , wherein each of the guide elements directs the light to a facet of the lens, and further, wherein the facet directs the light to at least one of the plurality of optical elements.
16. The method of claim 15 , wherein each of the plurality of optical elements comprises a lightguide and wherein each lightguide comprises a mirror or mirrors to redirect the received light into the eye to form the image anterior or posterior to the peripheral region of the retina.
17. The method of claim 16 , wherein each lightguide comprises one or more partial mirrors, the one or more partial mirrors operating to cause an image of a same luminance to be formed by each lightguide.
18. The method of claim 1 , wherein the circuitry includes a source of power and wherein the processor is programmed with a set of instructions that when executed, cause the processor to generate the control signal.
19. The method of claim 1 , wherein the optic comprises an optical substrate having a curvature substantially conforming to a back curvature of a lens of a pair of spectacles, the optic configured to fit behind the lens of the pair of spectacles.