In stigmatism, a long distance triangle can be seen without a lens and a cornea swelling, that is, without applying strain to an eye.

正常な場合:In the case it looks normally

There are two causes in farsightedness. The one is that since the crystalline lens is thinner than normal, the image of a long distance triangle is made behind the retina. In the retina, it becomes the blurred image.

The other one is that since the eye axis is short by nature, a long distance triangle does not connect an image to the retina. An image fades in the retina.

It seems that since the long distance thing of the child born by the longsighted state is hard to see, the child is going to blow up a lens and can see it.
It is a mistake although it seems that a good thing is considered since the long distance of farsightedness can be clearly seen. This is that it is not good in order to force an eye remarkable strain. It seems that parents do not notice this in many cases. Therefore, the ophthalmologist is going to find this by the 3 years-old child medical checkup.