Repetition Definition. Repetition is a literary device that repeats the same words or phrases a few times to make an idea clearer. There are several types of repetitions commonly used in both prose and poetry.
Chlorophyll looks green to us because most of the green wavelengths are reflected rather than being absorbed. For this reason, green light is not an effective color of light to power photosynthesis. Chlorophyll a and b together absorb light most effectively in the blue to violet range and the orange to red range.
Since blue light seems to be particularly harmful (it carries the most energy of all the visible wavelengths), choose a lens color that blocks a lot of blue. Amber or gray tint will work well. Do not choose lenses that transmit blue light. You can see what color light a lens will let through by holding the glasses up to a light and looking at the color of the light coming through the side that would face your eyes.