Turns out that long stints in outer space affect levels of cerebrospinal fluid. That explains why many astronauts who had 20/20 vision before space missions needed glasses upon return, according to a paper presented this week.
Noam Alperin's research team scanned the brains and eyeballs of seven astronauts prior to longer missions onboard the International Space Station. They compared those scans with nine astronauts who had short missions. The difference in cerebrospinal fluid (CSF) was significant:
The results showed that, compared to short-duration astronauts, long-duration astronauts had significantly increased post-flight flattening of their eyeballs and increased optic nerve protrusion. Long-duration astronauts also had significantly greater post-flight increases in orbital CSF volume, or the CSF around the optic nerves within the bony cavity of the skull that holds the eye, and ventricular CSF volume--volume in the cavities of the brain where CSF is produced. The large post-spaceflight ocular changes observed in ISS crew members were associated with greater increases in intraorbital and intracranial CSF volume.
In many countries you can buy inexpensive eyeglasses and contact lenses without a prescription. That’s not the case in the United States. In 2016 the American Optometric Association (AOA) spent $1.8 million lobbying and another $1.4 million in campaign contributions to ensure corrective lenses are expensive for Americans, and therefore highly profitable. Yascha Mounk, a […]
Approximately 14 percent of the world’s population suffer from dry eye disease (DED) but treatments are limited because it’s difficult to model the complex human eye for drug development. Now though, University of Pennsylvania bioengineers developed an “eye-on-a-chip” complete with a motorized blinking eyelid. The hope is that the artificial eye will lead to a […]
“Ocular dominance” is defined as “the priority of one eye over the other as regards preference of use or acuity of vision.” Awareness of your dominant eye is important for photography, golf, baseball, and archery. The above video explains how to conduct the Miles test to determine your dominant eye. (via Weird Universe)
People who ask themselves why they need a dashcam usually have one thing in common: They’ve never been a serious collision. Even in fender benders, these gadgets can save you an immense amount of time and hassle, stopping headaches before they even start. If you’re looking for a reliable starter cam, the myGEKOgear Orbit 110 […]
There’s no shortage of wireless chargers out there. So when one scores a Best of Innovation Award at the Consumer Electronics Show, we take notice. And, those industry nods mean good news for just about anybody with a smartphone, because the HyperCharger X Wireless Charger means there’s no excuse for losing power when you’re out […]
Once you’ve cut steak or poultry with some actual quality knives, it’s really tough to go back to those budget blades you bought at the department store a couple of decades ago. Consider that a fair warning about this 5-Piece Professional Damascus Chef’s Kitchen Set. The holiday discount makes it easy to buy for a […]