Electro-switchable spectacles for myopia treatment
An apparatus to treat refractive error of an eye comprises an electroactive component configured to switch between a light scattering or optical power providing configuration to treat refractive error of the eye and a substantially transparent configuration to allow normal viewing. The electroactive component can be located on the lens away from a central axis of the lens to provide light to a peripheral region of the retina to decrease the progression of myopia. The electroactive component can be located on the lens away from the central axis of the lens in order for the wearer to view objects through an optical zone while the electroactive component scatters light. The electroactive component can be configured to switch to the substantially transparent configuration to allow light to pass through the electroactive component and to allow the lens to refract light to correct vision and allow normal viewing through the lens.
1. An apparatus to treat refractive error of an eye, the apparatus comprising:
a lens comprising an optical zone; and
a switchable zone extending at least partially around the optical zone, wherein the switchable zone comprises an electroactive material switchable between a first configuration to substantially scatter or defocus light and a second configuration to substantially transparently transmit light through the lens;
wherein switchable zone is configured to focus an image of an object anterior or posterior to the retina in the first configuration and to focus the image of the object onto the retina in the second configuration;
wherein the lens comprises a first side and a second side, the switchable zone located on the first side, the second side comprising a curvature to provide a majority of an optical power of the lens.
2. The apparatus of claim 1 , wherein the switchable zone is substantially translucent in the first configuration and substantially transparent in the second configuration.
3. The apparatus of claim 1 , wherein images viewed through the switchable zone in the first configuration appear blurry.
4. The apparatus of claim 3 , wherein the switchable zone comprises a liquid crystal material configured to vary an optical power of the switchable zone and wherein a first optical power of the switchable zone in the first configuration differs from a second optical power of the switchable zone in the second configuration.
5. The apparatus of claim 4 , wherein the switchable zone comprises a plurality of switchable lenslets to vary the optical power of the plurality of switchable lenslets, the plurality of switchable lenslets comprising an index of refraction different from a first index of refraction of the electroactive material in the first configuration to vary the optical power and defocus light in the first configuration.
6. The apparatus of claim 5 , wherein the electroactive material comprises a second index of refraction in the second configuration closer to the index of refraction of the plurality of switchable lenslets.
7. The apparatus of claim 6 , wherein each of the plurality of switchable lenslets comprises the index of refraction and an optical profile related to an amount of defocus in the first configuration.
8. The apparatus of claim 1 , wherein an optical power of the optical zone remains substantially fixed for the first configuration and the second configuration of the switchable zone.
9. The apparatus of claim 1 , wherein the lens comprises an optical power and the optical zone comprises the optical power.
10. The apparatus of claim 1 , wherein the switchable zone comprises the first configuration when a voltage is applied to the switchable zone and the second configuration without the voltage applied to the switchable zone.