Why does eclipse cause blindness




















Outside the path of totality, you must always use a safe solar filter to view the sun directly. How can kids watch? Keep an eye on children and make sure they keep their glasses on at all times, perhaps helping to hold the glasses in place.

There are lots of ways to get your kids involved in the eclipse and all it has to offer. They can create their own "pinhole projection" by crossing the outstretched fingers of one hand over the other during the partial eclipse and enjoying the crescent suns that shine through the waffle-like pattern. One thing that people don't need to worry about is shielding their pets from the eclipse.

While animals may exhibit strange behavior during the eclipse , they know better -- better than humans, anyway -- than to look up. Photos: People watching eclipses through the years. There's no sense of wonder or excitement here.

Even as recently as the s, eclipses were still regarded with fear. This group gathered in a window to view the total solar eclipse over London through smoked glass -- touted as a safe method at the time -- in June Hide Caption. Clay cuneiform tablets are the first records of eclipses that we have.

This one, dated from to B. In , a group of riders dismount to observe a total solar eclipse on Haradon Hill near Salisbury, England. Notice the cloudy and threatening sky. King Louis XIV and the ladies of the court on the terrace of Marly castle, watching the total solar eclipse of Artist Johann Christian Schoeller depicted a crowd watching a total solar eclipse July 8, It occurred across China, Russia and parts of Eastern Europe.

This chromolithograph depicts people watching the total solar eclipse in Tarragona, Spain, in The Kew photoheliograph, the first astronomical instrument specifically designed for photographing celestial objects, was conceived by British astronomer and physicist Warren de La Rue in It was built for the Royal Society by Andrew Ross.

In , it was taken to Rivabellosa, in northern Spain, where it was used to photograph a total solar eclipse. Astronomers Maria Mitchell, left, Cora Harrison, center, and Maria's sister Phebe traveled to Denver to watch the total solar eclipse of Their telescopes are pointing toward the center of the solar system.

The "eclipse party" from Vassar College was featured in newspapers, and Maria Mitchell was highly regarded in her day as a pioneering female scientist. A crowd in a California town observes the total eclipse of the sun in September Amateur astronomers and spectators got up early to witness and photograph a total eclipse of the sun in London in On August 31, , people squinted through protective film to see a partial eclipse of the sun from the top deck of New York's Empire State Building.

Parisians watching the solar eclipse with the help of smoked glass on the steps of Sacre-Coeur, Paris, France, in October Before you start making plans for the next big U. An eclipse is defined as an event where an astronomical object is blocked from view. The eclipses we are most familiar with fall into two main categories: lunar eclipses and solar eclipses.

This type of eclipse poses no danger to the observer since you are just looking at light hitting the moon, not directly at a source of light.

A solar eclipse, on the other hand, is quite dangerous to look at directly. This type of eclipse occurs when part of the earth is covered in a shadow cast by the moon as it passes in front of the sun.

Abramson time. By Alana Abramson. Related Stories. Already a print subscriber? Go here to link your subscription. Need help? Visit our Help Center. The retina is home to the light-sensing cells that make vision possible.

When they're over-stimulated by sunlight, they release a flood of communication chemicals that can damage the retina. This damage is often painless, so people don't realize what they're doing to their vision. Solar retinopathy can be caused by staring at the sun regardless of its phase , but few people can stand to look directly at our nearest star for very long without pain.

It does happen occasionally — medical journals record cases in which people high on drugs have stared at the sun for long periods of time, causing serious damage.

Adherents of sun-worshipping religious sects are also victims. In , for example, Italian ophthalmologists treated 66 people for solar retinopathy after a sun-staring ritual. But during a solar eclipse , more people are at risk. With the sun almost covered, it's comfortable to stare, and protective reflexes like blinking and pupil contraction are a lot less likely to kick in than on a normal day.



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