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It will be even more difficult to know if students are paying attention when they're wearing the __CONTACT LENSES_ that Sony is developing. They play and record videos!
What are Contact Lenses?
A contact lens is a thin, curved lens that is placed on the tear film that covers your eye's surface. The lens is naturally clear but is often tinted to make it easier for wearers to handle.
Sony successfully patented a smart contact lens invention that makes use of a piezoelectric sensor, which detects and converts the kinetic energy in the vibration created by an eye blink into an electrical signal.
It also detects the duration of the blink: the lens will only capture a photo if the user intentionally blinks for more than 0.5 seconds, which is substantially longer than natural blinking, which lasts between 0.2 and 0.4 seconds. Sony contact lenses, like cameras, include automated focal and aperture changes ands a zooming option. Electromagnetic induction from magnetic fields released by a smartphone or a computer powers these contact lenses.
Therefore, the Correct answer is CONTACT LENSES
To know more about CONTACT LENSES click the given link
https://brainly.com/question/10921004
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