Lens-to-lens communication for contact lenses

1. A contact lens including:

blink detection circuitry configured to generate a blink signal in response to a blinking of an eye;

one or more electrodes disposed to come in contact with a tear solution of the eye when the contact lens is mounted on the eye;

a logic engine coupled to receive the blink signal from the blink detection circuitry; and

data transmission circuitry coupled between the one or more electrodes and the logic engine, wherein the logic engine includes logic that causes the data transmission circuitry to drive electrical data signals for communicating with a second contact lens onto the one or more electrodes in response to the blink signal reaching a pre-determined threshold, wherein the logic engine is coupled to the data transmission circuitry to synchronize communications with the second contact lens based upon the blink signal.

2. The contact lens of claim 1 , wherein the blink detection circuitry includes a photosensor coupled to generate an analog value as the blink signal in response to ambient light incident on the photosensor.

3. The contact lens of claim 1 , wherein the blink detection circuitry includes sensing electrodes, wherein the logic engine is coupled to measure an electrical impedance between the sensing electrodes as the blink signal, the sensing electrodes disposed on the contact lens to have an eyelid contact the sensing electrodes when the eye blinks, but not have the eyelid contact the sensing electrodes when the eye is not blinking.

4. The contact lens of claim 1 further comprising:

data reception circuitry coupled between the logic engine and a receiving electrode disposed to come in contact with the tear solution of the eye, wherein the data reception circuitry is coupled to output data to the logic engine in response to receiving a raw data signal from a different contact lens.

5. The contact lens of claim 4 , wherein the data reception circuitry includes:

a low noise amplifier (LNA) coupled to generate an amplified data signal in response to receiving the raw data signal; and

a correlator coupled to generate the output data in response to receiving the amplified data signal.

6. The contact lens of claim 1 , wherein the electrical data signals are voltage pulses below 500 mV, and wherein the data transmission circuitry includes at least one transistor coupled to generate the voltage pulses.

7. The contact lens of claim 1 , wherein the blink detection circuitry includes sensing electrodes adapted to measure an electrical impedance that varies dependent upon whether an eyelid is open or closed, and wherein the logic engine is coupled to the sensing electrodes to measure the electrical impedance between the sensing electrodes as the blink signal.

8. A lens-to-lens communication method, the method comprising:

detecting a first eye blink with blink detection circuitry included in a first contact lens;

transmitting data from the first contact lens to a second contact lens in response to detecting the first eye blink with the first contact lens; and

synchronizing data transmissions between the first contact lens and the second contact lens based upon detecting eye blinks including the first eye blink.

9. The method of claim 8 , wherein the data is transmitted via a non-wireless electrical path through biological matter disposed between two human eyes.

10. The method of claim 8 , wherein the data is transmitted via an electrical path, and wherein the electrical path includes a tear path between two human eyes.

11. The method of claim 8 further comprising:

activating electrical power for data transmission circuitry and data reception circuitry in response to detecting the first eye blink in the first contact lens, wherein activating the electrical power for the transmission circuitry is done prior to transmitting the data, wherein the data is transmitted with the data transmission circuitry.

12. The method of claim 8 wherein transmitting the data from the first contact lens to the second contact lens includes driving one or more electrical pulses onto one or more electrodes of the first contact lens, wherein the one or more electrodes are disposed to contact a tear solution of a human eye.

13. The method of claim 8 further comprising:

receiving the data with data reception circuitry of the second contact lens; and

adjusting an optical power of a second contact lens in response to the data.

14. The method of claim 8 , wherein transmitting the data is initiated following a pre-determined delay time after detecting the first eye blink.

15. The method of claim 8 , wherein detecting the first eye blink includes measuring an image signal generated by a photodiode disposed on the first contact lens.

16. A system comprising:

a first contact lens comprising:

blink detection circuitry configured to generate a blink signal in response to a blinking of a first eye;

one or more electrodes disposed to come in contact with a tear solution of the first eye when the first contact lens is mounted on the first eye;

a logic engine coupled to receive the blink signal from the blink detection circuitry; and

data transmission circuitry coupled between the one or more electrodes and the logic engine, wherein the logic engine causes the data transmission circuitry to drive electrical data signals onto the one or more electrodes in response to the blink signal reaching a pre-determined threshold; and

a second contact lens comprising:

one or more receiving electrodes disposed to come in contact with a tear solution of a second eye when the second contact lens is mounted on the second eye so that the one or more receiving electrodes receive the electrical data signals from the first contact lens via a biopath between the first and second eye;

a second logic engine; and

data reception circuitry coupled to output data to the second logic engine in response to receiving the electrical data signals from the one or more receiving electrodes, wherein the first and second logic engines synchronize communication of the electrical data signals between the first and second contact lenses based upon blinking of the first eye and a second eye.

17. The system of claim 16 , wherein the data reception circuitry includes:

a low noise amplifier (LNA) coupled to generate an amplified data signal in response to receiving the electrical data signals; and

a correlator coupled to generate the output data in response to receiving the amplified data signal.

18. The system of claim 16 , wherein the blink detection circuitry includes a photosensor coupled to generate an analog value as the blink signal in response to ambient light incident on the photosensor.

19. The system of claim 16 , wherein the blink detection circuitry includes sensing electrodes, wherein the logic engine is coupled to measure an electrical impedance between the sensing electrodes as the blink signal, the sensing electrodes disposed to have an eyelid contact the sensing electrodes when the eye blinks, but not have the eyelid contact the sensing electrodes when the eye is not blinking.

20. A contact lens including:

blink detection circuitry configured to generate a blink signal in response to a blinking of an eye;

one or more electrodes capacitively coupled to receive a raw data signal from a tear solution of the eye when the contact lens is mounted on the eye;

a logic engine coupled to receive the blink signal from the blink detection circuitry; and

data transmission circuitry coupled between the one or more electrodes and the logic engine, wherein the logic engine includes logic that causes the data transmission circuitry to drive electrical data signals for communicating with a second contact lens onto the one or more electrodes in response to the blink signal reaching a pre-determined threshold, wherein the logic engine is coupled to the data transmission circuitry to synchronize communications with the second contact lens based upon the blink signal.

21. The contact lens of claim 20 , wherein the blink detection circuitry includes a photosensor coupled to generate an analog value as the blink signal in response to ambient light incident on the photosensor.

22. The contact lens of claim 20 , wherein the blink detection circuitry includes sensing electrodes, wherein the logic engine is coupled to measure an electrical impedance between the sensing electrodes as the blink signal, the sensing electrodes disposed on the contact lens to have an eyelid contact the sensing electrodes when the eye blinks, but not have the eyelid contact the sensing electrodes when the eye is not blinking.

23. The contact lens of claim 20 further comprising:

data reception circuitry coupled between the logic engine and a receiving electrode capacitively coupled to receive the raw data signal from the tear solution of the eye, wherein the data reception circuitry is coupled to output data to the logic engine in response to receiving the raw data signal from a different contact lens.