The "rod-cone break" in the dark adaptation curve occurs after about in the dark.

The correct answer is "7 minutes".

The Rod-Cone-Break is considered to be a dark environment adaptation function in the eye, wherein for an estimated time of the first ten minutes in the dark, the cones needs less light to reach a threshold response than do the rods. Thereafter, the rods need less light. The point at which the rods become more sensitive is called the rod-cone break.

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