Patent US10314530

Electronic ophthalmic lens with sleep monitoring
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US10314530

1. A method for monitoring sleep with a powered contact lens, the method comprising: (6) (5)

disposing with the contact lens a processor, a clock, an eye movement sensor, and a computer readable storage medium having instructions stored therein, which when executed by the processor, cause the powered contact lens to perform the steps of:

activating the powered contact lens;

initiating the clock within the lens to track a passage of time;

determining at a first eyelid sampling rate whether eyelid closure has occurred;

when eyelid closure is detected, sampling at least once the eye movement sensor within the contact lens, and

determining whether an eye movement threshold is exceeded, when the eye movement threshold is exceeded, retrieving a time stamp from the clock;

storing the time stamp and a reading of the eye movement sensor; and

determining whether the reading is below the eye movement threshold, when the reading is below the eye movement threshold, storing an indication of an ending of a rapid eye movement (REM) and returning to determining whether eyelid closure has occurred.

2. The method according to claim 1, further comprising: (1) (3)

measuring a light level with at least one photosensor present on the lens;

storing the light level and current reading from the clock; and

determining when a change in light level occurs and storing the current time stamp from the clock with the light level reading.

3. The method according to claim 2, further comprising: (0) (2)

4. The method according to claim 1, wherein sampling of the eye movement sensor occurs at a first motion sampling rate until the reading exceeds the threshold, then sampling at a second motion sampling rate. (0)

5. The method according to claim 1, wherein when eyelid closure is detected, then sampling eyelid closure at a second eyelid sampling rate that is slower than the first sampling rate. (0)

6. The method according to claim 1, further comprising: (0) (2)

7. The method according to claim 1, further comprising: (0) (7)

monitoring available memory for storing readings;

when the available memory is below a low memory threshold, performing at least one of

storing a time stamp representing low memory based on the current value of the clock,

reducing the sampling rate for the eye movement sensor,

terminating further sampling of the eye movement sensor,

storing future of readings the eye movement sensor over the earliest stored readings in the memory, and

deleting the stored sensor readings associated with the lowest clock reading and shifting the remaining stored sensor and clock readings in the memory.

8. The method according to claim 1, wherein storing the readings includes transmitting the readings to an external device for storage. (3) (0)

12. A method for monitoring sleep with a powered contact lens, the method comprising: (4) (5)

activating the powered contact lens;

initiating the clock within the lens to track a passage of time;

sampling at least once the eye movement sensor within the contact lens; and

determining whether a first eye movement threshold is exceeded, when the first eye movement threshold is exceeded retrieving a time stamp from the clock,

storing the time stamp accumulator reading and a reading of the eye movement sensor at least one of the accelerometer, and

determining whether the reading is below a second eye movement threshold, when the reading is below the second eye movement threshold, storing of an ending of a rapid eye movement (REM).

13. The method according to claim 12, wherein sampling of the eye movement sensor occurs at a first eye movement sampling rate until the reading exceeds the eye movement threshold, then sampling at a second eye movement sampling rate. (0)

14. The method according to claim 12, further comprising: (0) (2)

15. The method according to claim 12, further comprising: (0) (2)

16. The method according to claim 12, wherein any storing reading includes transmitting the reading to an external device for storage. (0)

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Patent US10314530

Electronic ophthalmic lens with sleep monitoring

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