What Do You See?

Riddle: I am covered with three layers, two of them can be very sensitive, my layers can cover me in a heart beat or a long time. What am I?

Answer: A cats eye.

Source: https://www.riddles.com/3374

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I am covered with three layers, two of them can be very sensitive, my layers can cover me in a heart beat or a long time. What am I? — What do you see? by L.K.KITTYCAT v1.

Riddle: I am covered with three layers, two of them can be very sensitive, my layers can cover me in a heart beat or a long time. What am I? Answer: A cats eye. — by L.K.KITTYCAT v2.