Mauricio Cordoba, a licensed optometrist from Otavalo, Ecuador, gives us some useful tips about how often to get our eyes checked, what to keep in mind when purchasing glasses, etc.
To carry out the "disappearing coin" experiment, one only needs a container with water, a metal glass and a coin. Witness it here!
Matches in Transcript
Caption 4 [es]: [Al bajar la posición de los ojos, la moneda desaparece oculta por el bote.] Caption 4 [en]: [Upon lowering the position of one's eyes, the coin disappears, hidden by the container.]
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