You bring up a good point. Though I haven't caught up on all the posts yet this evening and someone may have already mentioned this, EPGL's patent app that was recently published does include a claim for use of the piezo sensing (ciliary muscle contraction) method for use with eyeglasses.
The piezo device senses the muscle contraction and transmits info via wireless xmission to the eyeglasses; or AR goggles; or whatever external wearable device.
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