Will the flash affect the baby's vision?

A few days ago, a series of official and mainstream media WeChat Weibo posted a very scary news. It is said that a 3-month-old baby was blind because of close contact with a flashlight. After examination, it was found that his left eye vision was 1.2 and his right eye vision was 0.2.

Flash is not as powerful as you think.

The reason why this rumor spread so fast actually comes from many parents' worries about the flash. The story in the rumor just hits people's inherent doubts: will the flash hurt the baby?

When we discuss toxicity, we will take dose as the core index, and so will light. When I talked about night lights and other light sources before, I once said that the core issue of discussing the harm of light to the eyes is brightness. It is nonsense to discuss any harm without light. What about the flash with how bright? We always thought that the flash was bright, which was only compared with the dark environment at that time. In fact, the brightness of the flash is not as high as we thought.

Cell phone flashes, turn off the lights.

Let's talk about the rumored "blinding" mobile phone LED flash, which is generally in the range of several lumens to dozens of lumens. By comparison, a standard candle 12.57 lumens, a desk lamp 30 and a projector 250. The flash of a mobile phone is similar to a flashlight or a desk lamp, so for many people, the main use of the flash of a mobile phone is a flashlight. Can a flashlight blind you?

Brightness is also related to the distance between the same light sources. After considering this factor, the unit of brightness is lx (lux). If it's true that the distance between the mobile phone and the eyes is only one bottle-that is, about 20 cm, the brightness may be in the range of ten to several hundred lx, which is similar to the light we often read. On a sunny day, the sun shines directly, and the brightness is about 65438+ million IX, which is hundreds or even thousands of times that of a mobile phone flash. It is meaningless to discuss injury or even blindness under the brightness of mobile phone flash.

Turn off the camera and studio lights.

Let's make the scene more spacious. What if it's not a cell phone flash, but a camera flash, or in a studio? Compared with the LED flash of the mobile phone, the brightness of the camera's own flash will be much higher, the external flash will be higher, and the professional lighting equipment used in the studio may be higher. But that doesn't mean we need to worry that they will hurt the baby's eyes.

Because the brightness will drop rapidly with the increase of distance, using the flash of a professional camera or in the studio, the distance between the flash and the baby's eyes is generally more than a few meters, and there are soft masks and other equipment to cooperate. At such a distance, the brightness felt by the eyes is also safe.

In fact, whether at night or indoors, the purpose of using flash is nothing more than to get close to the effect of daytime and take clear photos. In order to take clear photos, photographers will also choose a larger aperture, a slower shutter and a higher ISO, so the flash does not need to reach the brightness of sunlight during the day. Under normal use, the camera and studio flash will not have adverse effects on the baby.

Flashbang

Well, if you can't dispel your concerns by comparing with tens of thousands of IX sunlight, there is another thing called non-lethal weapon "-flash bomb, its brightness is tens of millions of lx, which is tens of thousands of times that of ordinary flash." "This brightness may be similar to the effect of holding a high-power flash close to the eyes to self-harm. But unless you hit your eyes with a flash bomb as a brick, you can't cause blindness or other long-term injuries.

Still not at ease? Give you four more reasons.

In addition to low brightness, here are some reasons not to worry about the flash hurting your baby's eyes:

1. Flash is a divergent light source, which will not cause damage similar to laser pointer;

2. The flash is turned on for a short time, and compared with the damage that long-term direct sunlight may cause to the eyes, the flash of a fraction of a second has little effect;

3. Infants' pupils are also smaller than those of adults, which means that the amount of light passing through the pupils will be less;

Babies are not interested in taking pictures, so they seldom stare at cameras and flashlights like adults.

To sum up, if you want to shoot with a flash, you don't need to worry about any harm, and you don't need to be scared by rumors. The only thing to worry about is that after the flash scares the baby, you may have to coax him; And can you really use a flash for your photography?

This article is selected from the "Ma Bao Tribe" who want to know more about breastfeeding and mother-infant knowledge. Please pay attention to WeChat KM0772 or KM066 1. Ma Bao tribe not only provides professional breast-feeding instruction, but also provides a series of door-to-door services during lactation. There are various opinions about breast-feeding, which not only makes breast-feeding mothers at a loss, but also makes them in a hurry. Therefore, Ma Bao tribes focus on postpartum maternal services. Teacher Zhang, an excellent instructor, has been online for a long time, giving you the most abundant and comprehensive information. You can also share your parenting experience with us. Finally, I would like to accompany you and your baby to grow up healthily and happily! !