Changes the shape of the opsin protein in a process called beaching
the reverse reaction trans to cis requires an enzyme reaction and is very slow
this explains why you are initially blind when you walk from sunlight to a dark room; in the light almost all your retinal was in the trans form and it takes time to form enough cis retinal to respond to the lower level of light indoors
the light intensity is also too low to stimulate the cones and takes about 20 minutes for enough rhodopsin to reform for us to see properly.
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