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Thank you for your inquiry to NASA of April 30, 2010.
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Cosmic Heliospheric Learning Center to me
show details 1:43 PM (2 hours ago)
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Thank you for using the "Ask a Physicist" service on the Cosmicopia
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Hi - I am away from the office from April 18th - May 17th. In my absence you can contact Cynthia Lodge (OCFO SID Director) for help.
The fully dark-adapted eye, in which photopigment regeneration is complete, restores retinal sensitivity to its maximal level. Rods and cones differ markedly, however, in their rate of dark adaptation. Cones attain maximum sensitivity in 5-7 minutes, while rods require 30-45 minutes or longer of absolute darkness to attain maximum sensitivity after exposure to bright light.