Andrew Huberman· PhD
Lots of evidence now showing that if you look at things up close for too long, the eyeball lengthens, which in some sense can create myopia.
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The evidence is convergent. Multiple independent sources reach the same conclusion, the underlying mechanism is well-characterized, and even the field's most cautious voices treat it as worth doing.
Lots of evidence now showing that if you look at things up close for too long, the eyeball lengthens, which in some sense can create myopia.
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if during development, you or an animal exclusively looks at things that are up close, very close to the eye, and doesn't ever get long-range vision, the eyeball lengthens. And when that happens the lens, which, of course, is in the front of the eyeball, which focuses the light onto the back of the eyeball, which is where the so-called neural retina is, where the cells that sense light are, that visual image lands in front of as opposed to directly on the light-sensing portion of the eyeball that we call the neural retina. It lands too close or near the lens as opposed to on the back of the eyeball. And that's part of the reason what we call the consequence of that nearsighted myopia.
In fact, it should come as no surprise that the incidence of myopia, of nearsightedness, is increasing dramatically around the world but is increasing particularly fast in children and in young adults and even in adults who are viewing things at very close range, so 2 and 1/2 feet or less.
so if you take a young person and you exclusively have them perform near tasks their eye will grow longer so that those near objects are in perfect focus
if we do a lot of close viewing the eyeball actually changes shape and lends itself to things like myopia