The eye can see a much greater range of light and dark than a camera can, which is why windows look like glowing boxes in daylight photos taken indoors.
Only photons with energy greater than that of the band gap can excite electrons from the valence band to the conduction band; therefore, the smaller the gap, the more efficiently light will be converted to electricity since there is a greater range of light frequencies with sufficiently high energies.
Perhaps surprisingly, therefore, on close inspection the diversity of eye designs and light sensing mechanisms that evolved in the ocean are more varied than on land, reflecting the greater range of light environments and lifestyles of the marine world.
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Animal vision spans a great range of complexity, with systems evolving to detect variations in light intensity, distribution, colour, and polarisation.
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In addition, the most dominant bacterium in the Spanish crystallizer pond, Salinibacter ruber was shown to produce a novel type of rhodopsin (xanthorhodopsin) that uses carotenoid antennae to absorb across a greater range of wavelengths of light [ 46].
