Retinal prosthesis techniques
Apparatus for use with an external non-visible light source is provided. The apparatus comprises an intraocular device configured for implantation in a human eye, and comprising an energy receiver. The energy receiver is configured to receive light emitted from the external non-visible light source, and extract energy from the emitted light for powering the intraocular device. The intraocular device is configured to regulate a parameter of operation of the intraocular device based on a modulation of the light emitted by the external non-visible light source and received by the energy receiver. Other embodiments are also described.
1. Apparatus comprising:
a light source configured to emit non-visible light, and to be disposed external to a human eye;
an intraocular device, comprising at least one receiver configured for implantation in the human eye, the at least one receiver having an image reception portion and an energy reception portion configured to receive a power signal from a non-visible light beam emitted from the external light source; and
at least one control unit configured to prevent reception of at least a portion of the power signal by the image reception portion.
2. The apparatus according to claim 1 , wherein the control unit is configured for implantation in the eye.
3. The apparatus according to claim 1 , further comprising a filter, wherein the control unit is configured to prevent energy reception by sending a control signal to activate the filter.
4. The apparatus according to claim 1 , wherein the control unit is configured to prevent energy reception, by sending a control signal to deactivate the image reception portion.
5. The apparatus according to claim 1 , wherein the energy reception portion is additionally configured to receive visible light.
6. An intraocular device configured for epi-retinal implantation in a subject's eye, and configured for use with a plurality of photosensors, each photosensor configured to detect ambient photons and to generate a signal in response thereto, the intraocular device comprising:
a plurality of stimulating electrodes configured to penetrate a retinal layer of the subject's eye; and
driving circuitry, coupled to the photosensors, and configured to drive the electrodes to apply electrical pulses to a retina of the eye in response to the signal from the photosensors, wherein the driving circuitry is configured to vary a frequency of the pulses based on intensity of the ambient photons received by the photosensors.
7. The intraocular device according to claim 6 , wherein the intraocular device comprises the plurality of photosensors.
8. The intraocular device according to claim 6 , wherein the driving circuitry is further configured to vary a parameter of the electrical pulses selected from the group consisting of: a number of the pulses, a duration of each pulse, and a pulse repetition interval of the pulses.
9. The intraocular device according to claim 6 , wherein the driving circuitry is configured to reduce sub-harmonics by jittering the pulse frequency.