Non-circular contact lenses with payloads
An eye-mounted display includes a scleral contact lens with one or more femtoprojectors that project images onto the user's retina. The scleral contact lens has a non-circular perimeter, for example elongated along the direction of the eye opening. The non-circular shape can result in less slippage and/or rotation of the contact lens relative to the eye. If the contact lens is elongated (compared to traditional circular lenses), then it can contain conductive coils that enclose a larger area. Thus, the lens increases coupling efficiency for power or data transfer. There can also be more space within the contact lens for payloads.
1. An eye-mounted display comprising:
a scleral contact lens that rests on a sclera of a user's eye, the scleral contact lens having a non-circular perimeter;
a femtoprojector mounted in the contact lens, the femtoprojector projecting images onto a retina of the user's eye when the contact lens is mounted on the user's eye; and
a conductive coil contained in the contact lens, the conductive coil wirelessly receiving power to power the eye-mounted display, where the conductive coil has a non-circular shape and also has a larger area than a circular conductive coil that would also fit within the contact lens.
2. An eye-mounted display comprising:
a scleral contact lens that rests on a sclera of a user's eye, the scleral contact lens having a non-circular perimeter;
a femtoprojector mounted in the contact lens, the femtoprojector projecting images onto a retina of the user's eye when the contact lens is mounted on the user's eye; and
a conductive coil contained in the contact lens, where the conductive coil has a non-circular shape and also has a larger area than a circular conductive coil that would also fit within the contact lens.
3. The eye-mounted display of claim 2 where a two-dimensional projection of the perimeter of the scleral contact lens onto a plane is non-circular.
4. The eye-mounted display of claim 2 where the conductive coil has a same shape as the non-circular perimeter of the contact lens.
5. The eye-mounted display of claim 2 where the conductive coil lies within 2 mm of the non-circular perimeter of the contact lens.
6. The eye-mounted display of claim 2 where a width of the contact lens is larger than a height of the contact lens.
7. The eye-mounted display of claim 6 where a two-dimensional projection of the perimeter of the contact lens has an oval shape.
8. The eye-mounted display of claim 6 where a two-dimensional projection of the perimeter of the contact lens has an irregular shape.
9. The eye-mounted display of claim 2 where the contact lens extends beneath an eyelid of the user's eye when the user is wearing the contact lens, and a width of the contact lens is larger than a height of the contact lens.
10. The eye-mounted display of claim 2 where a width of the contact lens is at least 20 mm.
11. The eye-mounted display of claim 2 where a two-dimensional projection of the perimeter of the contact lens encloses an area of at least 80 mm 2 .
12. The eye-mounted display of claim 2 where the contact lens contains an interior space outside an optical zone of the contact lens, the interior space containing a payload for the eye-mounted display.
13. The eye-mounted display of claim 12 where the interior space has a thickness of at least 0.2 mm over an area of at least 10 mm 2 or has a volume of at least 1 mm 3 .
14. The eye-mounted display of claim 2 where a portion of the contact lens in front of the sclera has an appearance that matches a coloring of the sclera.
15. The eye-mounted display of claim 2 further comprising a payload mounted in a portion of the contact lens in front of the sclera, where the portion of the contact lens in front of the sclera has an appearance that matches a coloring of the sclera and obscures the payload.
16. The eye-mounted display of claim 2 where a shape of the perimeter is customized to the user's eye.
17. The eye-mounted display of claim 16 where an interior surface of the contact lens is customized to a contour of the user's eyeball.
18. The eye-mounted display of claim 17 where the contour of the user's eyeball is measured by direct molding or structured light scanning, and the interior surface of the contact lens is customized based on the measured contour.
19. The eye-mounted display of claim 17 where the contact lens is manufactured into a customized aspheric shape using a multi-axis lathe.
20. The eye-mounted display of claim 2 where the contact lens is in contact with the sclera over a contact area that is at least 3 mm wide.