Solar Eclipse and Eye Safety

Introduction

Except during the brief period of a total solar eclipse when the moon blocks the bright face of the sun completely, it is not recommended or safe to look directly at the sun without the help of specialized equipment for solar viewing. Seeing the bright part of the sun with the help of a camera lens, binoculars, or a telescope without any solar filter covering the optic's front portion can damage the eyes. Read the article to learn more.

What Is Meant by Solar Eclipse?

In a solar eclipse, the moon blocks the sun from being viewed. This happens for about two hours. There are different stages of solar eclipse; these are

• Partial Solar Eclipse:

  • Initially, there will be a partial solar eclipse, during which the moon partially covers the sun.

  • This partial solar eclipse occurs in most places for about an hours.

  • To view the sun at this stage of the solar eclipse, specialized eye protection is required. Eyeglasses are not enough.

• Full Solar Eclipse:

  • A full solar eclipse occurs when the moon completely covers the sun.

  • This stage will last only one to two minutes. The daytime sky will turn into a deep twilight sky. The sun’s outer atmosphere, known as solar corona, slowly appears, glowing like a halo around the moon.

  • The stars and planets will be very visible at this stage.

  • The temperature may drop to some degrees.

  • Only during this solar eclipse stage can the person remove the eye protection and wear it back before the full solar eclipse is over.

• Partial Eclipse:

  • The eclipse will again become partial for an hour, and the moon moves away from the sun.

  • The person should wear eye protection during this stage.

Watching a solar eclipse is a very good experience, but people should protect their eyes as it can damage their eyesight or even result in blindness.

Will Staring at the Sun Cause Eye Damage?

Staring or looking at the sun directly without proper eye protection for even a short period can result in permanent retinal damage, which can lead to blindness, called solar retinopathy. Normal sunglasses, even the darker shades, will not provide any protection to the eyes from the solar eclipse. The solar eclipse can be seen directly and safely by using specialized eclipse glasses with solar filters.

What Are the Symptoms Related to Eye Issues Caused by Solar Eclipse?

It usually takes a few hours to some days to release information about the damage caused to the eye due to direct viewing of the eclipse. If the person feels any discomfort or strain after seeing the solar eclipse, then the person should consult the doctor immediately. Some common symptoms of eye damage caused by solar eclipses are

• Loss of central eye vision.

• Changed color vision.

• Distorted vision.

How to Know Whether the Solar Eclipse Glasses Are Safe?

Solar eclipse glasses are usually used to view the solar eclipse, which can protect the person from eye damage. When choosing a solar eclipse glass, the person should look for a reputable source certified with an ISO 12312-2 solar filter. This is the international standard for eclipse viewing glasses. If the person wants to take pictures of the solar eclipse or view through a telescope or binoculars, then a specialized protective lens and a solar filter must be used to avoid eye injury. The sun should not be viewed directly during the solar eclipse with any protection as it can cause severe eye damage.

How Does a Person Know Whether Their Eyes Are Affected Due to Solar Eclipse?

When the retina gets damaged by solar radiation, it can result in a condition called solar retinopathy. This condition is characterized by

• Permanent blindspots.

• Distortion in the vision.

• Permanent or partial blindness.

Other symptoms include

• Blurred vision.

• Enhanced light sensitivity.

• Central blind spots in one or both eyes.

• There may be alterations in how the colors are viewed.

• Distortion.

An eye may be damaged during a solar eclipse if a person experiences small flashlight spots, similar to the aftereffects of camera flashes. If the flashing light issue is resolved but the area where the flashing occurs remains dark, then permanent damage has been caused.

How to Plan and Watch the Solar Eclipse?

• Carefully look and analyze the solar filter or lenses or solar eclipse glasses the person will use. If there are any scratches or damage to the glass or lens, then those should not be used.

• Read the instructions carefully and follow them before using any solar eclipse glasses or solar lenses.

• Before viewing the solar eclipse, the person should stand still and cover the eyes using the eclipse glasses or viewer.

• After seeing the solar eclipse run away, remove the solar glasses; these should not be removed while viewing the solar eclipse.

• Solar eclipses can be viewed without glasses only during the total eclipse when the moon completely covers the sun. This will occur only for one to two minutes. As soon as the slightest hint of the sun starts to appear, the person should wear the solar eclipse glasses back to watch the rest of the solar eclipse.

• The person should never look at the eclipsed or partially eclipsed sun through an unfiltered camera, binoculars, or telescope. The sun should not be seen at this stage, even if the person is wearing solar glasses or a solar viewer, as the intense solar waves coming from the sun can damage the lens or the solar glasses and can damage the eyes.

• If anyone experiences any vision issues or discomfort after viewing the solar eclipse, they should consult with a doctor immediately.

Conclusion

The solar eclipse is a phenomenon in which the moon covers the bright face of the sun. Most people are excited to watch this sequence, but they should also be careful while doing so. People should wear solar glasses or viewers while watching the eclipse, as intense solar waves can affect the eyes and cause permanent damage.