What Is Irregular Astigmatism?

In the same meridian, or in different parts of the same meridian, the performance of different refractive power is called irregular astigmatism. Extremely slight refractive errors on the meridians are considered physiological. For example, the lens has a refractive error that is mild and not sensational. Symptoms of irregular astigmatism may occur only when the diopter is deepened, such as in the early stages of cataracts, and sometimes such defects can cause polypsy.

Irregular astigmatism

In the same meridian, or in different parts of the same meridian, the performance of different refractive power is called irregular astigmatism. Extremely slight refractive errors on the meridians are considered physiological. For example, the lens has a refractive error that is mild and not sensational. Symptoms of irregular astigmatism may occur only when the diopter is deepened, such as in the early stages of cataracts, and sometimes such defects can cause polypsy.

Western Medicine Name

Irregular astigmatism is mainly caused by unevenness of the corneal refractive surface, such as

The corneal refractive surface is uneven due to keratoconus, corneal trauma or scar left by inflammation, which makes the refractive power of each meridian or the same meridian inconsistent.

1. The degree of vision loss varies greatly due to factors such as astigmatism, dioptric power, and axis direction. The astigmatism that belongs to the physiological range usually has no effect on near and far vision. The astigmatism of height is mostly due to the combination of linear amblyopia or other abnormalities , Vision loss is obvious, and it is difficult to obtain good corrected vision. Obvious irregular astigmatism, often only in

Treatment of all severe irregular astigmatism is difficult and clinical treatment is not satisfactory. Because this type of disease is not based on optical principles in the treatment, it must be tested repeatedly. However, it often takes a lot of time and patience, and it is still difficult to get satisfactory results. With the continuous updating of contact lenses, such as hydrophilic contact lenses, high oxygen permeability rigid contact lenses (RGP), medical contact lenses, irregular astigmatism, especially the treatment of keratoconus can be solved optically. ^[1]