The buttons should read "vision test," "hearing test," "STOP," and "reset timer."
the vision test button, when clicked, should have a random delay between 5 and 10 seconds, changing during every test before the light will come on. The timer should start at exactly the same time the light comes on.
the hearing button, when pressed should do exactly the same thing, except instead of a light coming on, a bell will sound. The bell will only sound once.
The user will need to click the stop button to stop the timer. The light should turn off when the stop button is pressed. The stop button should be red.
The reset timer button should reset the timer.
Language isn't specified, so you can use whatever language suits you.
Thanks.

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