Why do squinting help us see better?

The squint action changes the shape of the passing light, creating a sharp image on the retina.

In addition, there is a small part of the retina called fovea that contains cones. Squinting helps change the eye shape so that light focuses on the fovea, making the face more visible to the objects.

Regular squinting is not good for the eyes.

Also when squinting, light from different directions decreases, accidentally pulling light sources together, focusing on objects that make images sharp.

Squinting originates from the habit: people narrow their eyes unconsciously, show concentration, help the brain work effectively and see better.

The act of squinting in people is related to the hunting instincts of animals. Instead of focusing on many different things, focus on a certain thing, which helps to hunt more effectively.

However, frequent squinting is not good for the eyes because eyeballs have to work too much, putting pressure on the lens, long time will seriously affect eyesight.