Medical experts say that "solar retinitis," a condition in which the macula of the retina is burned by looking directly at the sun's ultraviolet and infrared rays over a long period of time, is virtually untreatable. The macula of the retina is the most sensitive part of the retina, which allows light to converge and make images clear. Once burned, the retinal macula will never recover. Cameras, telescopes and other observation instruments directly to the sun, will not only cause damage to the instrument lens, the optical aggregation of sunlight will directly burn the retina.
In order to reduce the large amount of ultraviolet and infrared rays in the sunlight, please do not use
Sunglasses: This is one of the most dangerous methods of observing a total solar eclipse, and also one of the most widely spread by the fallacy. Sunglasses and sunglasses are not specifically designed for observing total solar eclipses, and wearing sunglasses/sunglasses directly to observe total solar eclipses will harm your eyes.
Exposed negatives: Some people have used this method to observe total solar eclipses in the past, but since everyone utilizes negatives at different levels, the degree of exposure of the negatives varies, which does not guarantee the safety of the observation, and this method is not recommended.
Candle smoked glass: This is also a relatively early earth method, but there are still problems, due to the degree of blackening, glass thickness and other uneven problems, but also can not fully guarantee the safety of observation, do not recommend this method.
Floppy disk core: the same candle blackened glass.
X-ray negatives: this method has not been fully demonstrated to confirm that it is not recommended to use.
Pouring ink into the water: although the water with ink has turned into a black background, but will still reflect more sunlight into the eyes of the observer, will still cause some damage to the eyes. It is not recommended.
For visual safety, please use
Specialized observing glasses: (or homemade observing equipment filtered by professional light-reducing film such as "Bard film")
Small Hole Imaging Method: Use a needle to pierce a small hole in a piece of paper, and observe a total solar eclipse through the projection of the small hole on a separate piece of paper or other interfaces; alternatively, you can use two fingers to observe a total solar eclipse. In addition, two fingers can be used to form a small hole to observe.
Telescope projection observation method: The image of the sun will be projected on the ground after passing through a telescope, and a total solar eclipse can be viewed by observing the projection. However, a total solar eclipse should never be viewed directly through a telescope, as it can lead to blindness in severe cases.
Welding goggles: There are stores that specialize in selling welding goggles. However, it should be noted that welding goggles are not the same as sunglasses, which cannot be used to observe a total solar eclipse.
Are you ready to watch the once-in-a-century total solar eclipse on July 22, 2009?
When observing a total solar eclipse, you should choose an area with clear skies as much as possible and pay attention to the safety of your eyes. Because sunlight is a million times stronger than moonlight, it should not be viewed directly with the naked eye or through telescopes without light-reducing equipment, or it could easily cause retinal damage or even blindness. During a partial solar eclipse, a safer way is to wear a pair of total solar eclipse viewing glasses or use a water basin filled with ink to view the eclipse through reflection. When observing a total solar eclipse with a telescope, be sure to add a filter in front of the eyepiece or detector to avoid burning your eyes. During a total solar eclipse, you can use the naked eye to view it directly, and remove the scrim or filter before photographing it with a telescope.
The total eclipse can be viewed with the naked eye at this time
No other time
Additionally, you can't see the total eclipse with the naked eye
The most convenient way to observe a total solar eclipse is to use an eclipse scope.
There are many kinds of eclipse observation glasses on the market today, and their main purpose is to filter visible light, infrared light and ultraviolet light. Open Taobao site, search "eclipse observation glasses", there are thousands of information.
How do you pick an observation lens?
Hangzhou Astronomy Technology Co., Ltd. general manager Qi Yong said: "At present, the regular manufacturers of solar eclipse observation mirror is the main material of the Bard film, but also in the field of astronomy in general use." Wearing this observation mirror, it is almost difficult to see the general object, only when viewing the sun, it will be clear. Currently the market sells mostly Sky-Watcher and Star Tran two brands of solar eclipse observation mirror produced by Suzhou Xinda Company, the price is between 5 yuan and 8 yuan.
How do I wear my goggles?
Before you start, carefully check if the eclipse goggles are intact, and stop using them immediately if they are broken. Children should always use them under the proper guidance of their parents and teachers.
Put on your goggles 30 minutes beforehand to get used to the darkness at first light. Everyone has the experience of walking into a dark room from a bright place and seeing almost nothing at first, only to have your vision return to normal after half an hour, which is called "dark adaptation". This is called "dark adaptation". When a total solar eclipse occurs, the sky and the earth in a very short period of time, "nightfall", do not let the "dark adaptation" ruined your total solar eclipse meal oh!
Take off your glasses 10 seconds before the eclipse so you don't miss out on astronomical wonders like the Bailey's beads. Once in the light stage, you need to wear glasses quickly to avoid eye burns.
The above practice is known as "two wear a pick".
Remember to take a break of 30 seconds or more every 3 minutes, and don't watch the sun for a long time.