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AUGUST 7, 2026
THE SENSES: PART V of V
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AIKEN-AUGUSTA’S MOST SALUBRIOUS NEWSPAPER • OUR 20th YEAR
uman vision is an utterly astonishing gift, one whose sheer complexity defies comprehension. Who among us can contemplate something roughly the size of a ping-pong ball (an average human eyeball) which contains a million of something? A million, after all, is a huge number, one that we can easily become desensitized to through over-exposure. And to clarify, we were not saying the eye contains a million examples of anything. It does not. It contains a hundred million — and that’s only for one thing: the retina, which contains over 100 million photoreceptors despite being roughly the size of a quarter. Think of the retina as a tiny solar panel, with each of its 100 million receptors so sensitive that they can detect a single photon of light. That’s the equivalent of hearing so sensitive that you could hear one molecule of air bump into your eardrum. At the center of the retina is a super-dense collection
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of cones (not rods) that make possible the highest visual resolution human eyes can achieve. Known as the fovea, this area, smaller than a pinhead, has on average more than 50,000 cones per square millimeter. A millimeter is about the thickness of a dime, or two credit cards. That is one incredibly tiny square, and it gets even more amazing: in the microscopic center of the fovea (called the foveola) the density can be as high as 200,000 cones per one-millimeter square. The fovea is like the retina’s super-HD pixel cluster, and it is why we can see stars at night, read fine print, and thread needles. You know how TV and computer screens create colors using RGB? If you look very closely at such screens, you’ll see that every color is some combination of Red, Green, or Blue, hence the acronym RGB. Human eyes have the same system, three types of cones, each one specializing in either red, green, or blue. Those three color channels make it possible for the average person to detect roughly a million different colors. There is a condition called tetrachromacy where people (almost always women) have a fourth cone type. Scientists say this condition makes it theoretically possible for such persons to perceive 100 million color variations. Color blindness is the result of bichromacy, having only two working cone types. Our eyes are full-color high-definition movie cameras with auto-focus and instantaneous image stabilization that makes any GoPro camera look like a toy by comparison. Go ahead, try it out right now: quickly tilt your head while keeping your eyes on the page. Your eyes will adjust. Researchers say the image adjustment you just experienced happens within about 7 milliseconds. A related aspect of our image stabilization capabilities are called saccades, pronounced suh-kahdz. It’s not a word most of us have heard before, but it’s a phenomenon we experience a few hundred thousand times a day. A saccade is what our eyes do when they move from one fixed point to another, like reading this line of type, or looking back and forth from a crossword grid to the clue section, or from Please see LOOK! page 16
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