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2

He may have extreme acuity, or he may even have an extra cone type that allows him to see extra colors (and more color attunement may allow easier reading of those particular plates). But, you won't know anything for sure by asking on here. Take him to an ophthalmologist and let us know what the doc says! If you aren't 40+ and have 20/20 vision and he's ...


17

The "normal" visual acuity in the Anglosphere is the 20/20 vision which means that on a Snellen chart characters with 8,86 mm height can be read conveniently from a distance of approximately 6 m. Now there are many known people who have very sharp eyes, having the doubled acuity of 20/10. This means they can discern characters of only 4,43 mm height from ...


16

Short answer Visual acuity decreases with age. Your son's age is within the age range that visual acuities are best. Acuity starts to decrease from about age 45. Background Visual acuity (visual resolution) first increases from birth up until around 4-6 years. Note that in the following graph better acuities are represented by lower numbers (logMAR ...


11

Short answer Peripheral vision is more light-sensitive than central vision. Background When you look directly at an object the image is projected onto the fovea. The fovea has maximal visual acuity (high resolution) and a high density of cones, which are specialized photoreceptors to sense colors. However, cones are not very sensitive to light. Here is a ...


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I had this same question. I believe the answer is this is a known effect caused by aberrations between your eyes and the way they perceive color. This effect is called Chromostereopsis. I know this is an old topic but hopefully this information will be useful to people like me who were also trying to learn more. ...


3

Preamble: This is a rather unsatisfying answer I'm afraid. I can't seem to find any animal that has exceptional eyesight and sees in monochrome. Even though machines cope better with shapes rather than colours, it generally seems like animals that rely on exceptional eyesight to survive tend to see in colour and have other neurological systems to ease "data ...


1

Most marine mammals, some nocturnal mammals, and some fossorial mammals are monochromats -- meaning they see in what is effectively greyscale. As previous commentators have mentioned, quantifying visual acuity is not a trivial matter. Still, I'd assume that under many measures a species such as the owl monkey--a monochromat--has quite good vision, at least ...



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