Why does the axis of hyperopia become shorter?

summary

Previously said that myopia is too long axis. In our daily life, we need to eat more fresh fruits and vegetables. On the contrary, hyperopia is that the eye axis is too short - relative to the eye's ability to focus light. Because the axis of the eye is too short, light converges behind the retina, resulting in blurred vision, so let's understand why the axis of the hyperopia eye becomes shorter??

Why does the axis of hyperopia become shorter?

First, children's crystals are very elastic; Their ciliary muscles have a powerful regulatory capacity. As a result, children and young people can easily increase the ability of the eyes to focus light, so that the light is re focused on the retina.

Second: human babies are born with hyperopia, and then reach emmetropia at the age of 18 months (emmetropia refers to the state of emmetropia or slight hyperopia), with an average of 125 degrees hyperopia. So normal eyes are slightly hyperopic.

Third: but there are a small number of people with large degree of hyperopia. In the process of emmetropia, the degree of hyperopia has not decreased, so these people are patients with hyperopia. The study found that three month old infants, if the degree of hyperopia is less than 400 degrees, then 80% of the situation will reach emmetropia; Only 50% of infants with 500 degree hyperopia can face squarely; If 600 degree hyperopia, only 30% will be emmetropia [1]. Fortunately, less than 4% of babies have hyperopia above 400 degrees.

matters needing attention

In short, hyperopia is too short axis, and presbyopia and axis has nothing to do with the loss of elasticity of the lens.