It is not normal for astigmatism to increase over the years.
Astigmatism is a type of refractive error, usually caused by congenital developmental abnormalities. In most cases, astigmatism is relatively stable and does not increase year by year.
If your astigmatism is increasing year by year, you should go to the ophthalmology department of the hospital for a corneal topography examination to rule out the possibility that it is caused by conical cornea. Conical corneas can cause an increase in astigmatism from year to year due to changes in the shape of the cornea. Once a diagnosis of conical cornea is made, it is usually treated with corneal cross-linking, corneal transplantation, etc. In addition, it is important to avoid rubbing the eyes.
In addition, patients should avoid rubbing the eyes and other bad eye habits. It is recommended that patients go to the ophthalmology department of the hospital every year when their astigmatism grows, so that the doctor can clarify the specific cause and then formulate a treatment plan.