The normal human eyeball is similar to a sphere. As myopia deepens, the eye axis becomes longer, and the volume of the eyeball gradually increases, just like blowing bubbles. As the volume increases, the wall becomes thinner, leading to various pathological changes in the fundus of the eye.

People who wear glasses for a long time often exhibit a mixture of axial myopia and refractive myopia. Therefore, eye deformation is not caused by glasses, but by myopia (axial myopia). The deeper the degree, the longer the eye axis, and the more prominent the eye appears. Eye protrusion is caused by myopia itself.

Eye deformation is caused by the elongation of the eye axis and protrusion of the eyeball after the degree of myopia deepens. This is a problem with the eyes themselves and has nothing to do with wearing glasses. If the eye is compared to an optical instrument, the distance from the uppermost cornea receiving light to the innermost retina receiving light can be seen as a central axis of the optical system, that is, the eye axis. The axis of the normal human eye is about 24mm. Generally speaking, for every 1mm increase in the eye axis, the degree of myopia increases by 300 degrees.

Myopia itself can lengthen the wheelbase of our eyes, which may cause the eyeballs to protrude. But there is a certain amount of space in our eye sockets. After the eye axis is elongated, if the space behind it is large enough, we may feel that the person's eyeballs are not protruding very clearly forward; But if the orbital space is relatively small after the eye axis is elongated, it will feel more prominent in the forward projection.