Myopic people squint to see more clearly, but is it true that the more they squint, the higher the degree?

When you see things blurred, it usually means that the lens can't accurately focus photons on the focus behind the retina. The light from the object you are looking at is also competing with the light from other objects in the field of vision. All these extra lights are like noise when listening to English. They blur the signal you need. When you squint, reducing the light of other objects is equivalent to peeling off some noise. Squinting is like a photographer narrowing the aperture of a camera when shooting a specific object. Circle a small hole with your index finger, middle finger and thumb, and then hold down the small hole in front of you to see the distant object. What you see now is not as vague as before.

Some people worry that frequent squinting will affect their eyesight. When squinting, the lens of the eye does change shape. But if we don't consider the role of eyelids, the occasional behavior and change are very small, and the impact on vision is almost negligible. But is long-term habitual squinting harmful?

1. Eyes are more prone to fatigue: I always like to squint at things. Although I can see things more clearly, it is actually more laborious. If you look at them for a long time, your eyes will be more tired, especially for students who go to school. If you always squint at things, your eyesight will decline faster and faster.

2. Deepen myopia: If the nearsighted eyes and glasses don't match, or habitually squint, then you have unconsciously made the myopia of your eyes higher and higher, which is why many children have already equipped glasses, but the degree is still deepening.

3. It may be that there is astigmatism in the eyes: squinting can improve vision to a certain extent through pinhole effect and crack effect in physics, so patients with astigmatism often squint when they look far away, and this bad habit can be corrected after wearing glasses. It should be noted that strabismus is not an inherent manifestation of astigmatism, and myopia patients will also have strabismus.

4. Amblyopia: Of course, if the baby squints, parents should be careful, maybe it is amblyopia. Generally speaking, parents find that their children's eyes are too close to the book when reading and writing; Small objects falling to the ground are not easy to be found by children; Walking is easy to trip over small objects; When looking at people, one eye is staring and the other eye is slanting; Tilt your head when looking at people, afraid of light, etc. You should go to the hospital for mydriasis examination regularly.