Will the naked eye see the eclipse in the end?

By | June 27, 2019

Around 8 am on July 22, 2009, the most important total solar eclipse of this century will occur. China is the best observation site.

The total solar eclipse lasted for more than two hours from the initial loss to the re-circle. The longest total solar eclipse time in China can reach 6 minutes, and the total food belt width can reach 250 kilometers. In most of China, 400 million people across the country can watch the total solar eclipse. The number of Chinese total solar eclipse observations will break the Guinness Book of Records, and the grand event will be unprecedented.

Previously, the author learned in many news reports: “Naked-eye eclipse can lead to blindness!”, the author is very shocked, will the naked eye see eclipse will lead to blindness? If it will, naked eyes See how the eclipse causes blindness? What are the symptoms? When we watch the solar eclipse, what measures should we take to effectively prevent possible eye damage? If the eclipse damage to the eyes has occurred What should I do? Do you have a cure?

With a series of questions, the author paid a special visit to the famous ophthalmologist Professor Yi Changxian, the astronomy enthusiasts association organizer Mr. Yang Shuzhen, and the astronomical equipment store Guangzhou Bo Mr. Guan Zhang, I hope that from the above three seniors who have led the way in various fields and have rich professional knowledge, I have got answers to all of the above questions.

Expert Profile: Yi Changxian

Professor Sun Yat-Sen University Center for Ophthalmology, Postdoctoral Fellow, Clinical Ophthalmology, University Hospital Zurich University

Good at treatment: diagnosis of common diseases of ophthalmology and main fundus diseases Treatment and ophthalmic laser treatment, including the diagnosis and treatment of various complex rare fundus diseases and refractory uveopathy.

author and Professor Yi (left) posed for

The sun naked eye can not

on many issues of concern to users, in the end the naked eye can not be the sun? Prof. Yi said that when looking directly at the sun, the human eye has a structure called a pupil. Its function is like the aperture of the camera. It adjusts itself with the light intensity of the outside world. When the camera is taking pictures, if the light is strong, the aperture will be adjusted very small. If the light is weak, the aperture of the camera will be larger. In contrast, the function of the pupil is the same. By adjusting the size of the pupil to adjust the light entering the eye, no one can directly look at the sun. The sun’s light is too strong. When looking directly at the strong light, people will instinctively avoid it. For example, the average person is outdoors. If the sun is very strong, people need to wear sunglasses even if they don’t look directly at the sun, and the eyes will feel comfortable.

The naked eye view of the eclipse is very eye-catching. The culprit is actually “lens”

The naked eye view of the eclipse will hurt the eye, the main “injury” where?

Professor Yi explained that there is a structure in the eye called a lens. The crystal acts like a convex lens, which collects light onto the retina to produce vision.

The so-called naked eye eclipse damage to the eye is actually a photochemical damage from the pathological point. It is too strong light. Through the pupil, after the refraction of the crystal, the light gathers to a small point and arrives. On the retina of the fundus, the energy of the retina to receive the point of convergence of the light is particularly large, and this part of the retina tissue temperature rises, resulting in a series of biochemical changes.

Watching the sun hurts the eyes, and the symptoms will appear after 1 to 4 hours.

Watching the sun hurts the eyes, usually called “octal eclipse disease” What is eclipse? Eclipse of the eclipse: medically called: Solar Maculopathy, refers to the macular lesions caused by sunlight, photochemical damage of the macula.

Professor Yi said that when people look at things, the most important thing is that the macula is working. The macula is part of the retina, about 1.5mm in size. When people are looking at the object, they are mainly looking at the yellow spot. The naked eye sees the lesion of the retina caused by the eclipse, mainly refers to the lesion of the macula on the retina: refers to macular edema, macular burn.

The most serious retinal macular degeneration that occurs in the eclipse is mainly caused by macular burns that cause perforation and macular hole formation. After the formation of the macular hole, the general visual acuity is generally below 0.2.

The more terrifying thing is that when a serious eye injury such as “yellow hole” is caused, the patient does not feel any sense at first. It takes 1 to 4 hours before symptoms appear. Why is this? Prof. Yi analyzed the author’s question from the physiological function of the retina: the macula is mainly a photosensitive organ, and there are nerves related to photosensitivity on the macula, but there is no pain-related nerve, the macula is perforated, and the patient is also There is no feeling associated with "pain" The three major symptoms caused by macular burns, “sight loss, visual distortion, and central dark spots” are only appearing one to four hours after the burn.
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