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Why do your eyes feel tired and you have headaches? Could astigmatism be the cause?
Astigmatism is a visual error in which the refractive power of the eye is asymmetric in direction, causing visual distortion or blurring, affecting vision regardless of distance. This condition can cause eye strain, headaches, and difficulty driving at night. According to a 2019 World Health Organization report, 123.7 million people worldwide are affected by uncorrected refractive errors, with astigmatism being one of the leading causes.
Astigmatism may cause blurred vision, double vision, eye fatigue, and even headaches. Some studies show a correlation between astigmatism and the incidence of migraines.
The onset of astigmatism usually occurs at birth, but may change or develop with age. If left untreated, especially if it occurs early, it can lead to amblyopia.
Causes of astigmatism
Congenital astigmatism
The cause of congenital astigmatism is unknown, but it is believed to be partly related to genetic factors. Research shows that genes play a small role in astigmatism, and some genetic variations, such as the PDGFRA gene located on chromosome 4, have been considered to be related to corneal astigmatism.
Acquired astigmatism
In addition, astigmatism can also be caused by cataract surgery or injury to the cornea. Scar shrinkage following an injury can cause the cornea to flatten in one direction, causing astigmatism.
Diagnostic methods of astigmatism
The process of diagnosing astigmatism requires a variety of tests, including using an eye chart to check your vision and using a keratometer to measure the curvature of the cornea. These methods can help doctors quantify the extent and direction of astigmatism.
During the testing process, doctors may use advanced technologies such as corneal topography to obtain a more accurate representation of the corneal shape.
Treatment options for astigmatism
There are three treatments for astigmatism, namely glasses, contact lenses and surgery. Glasses are the easiest option, while contact lenses provide a wider field of view. Surgery permanently corrects astigmatism by changing the shape of the eye, and this type of surgery carries higher risks and costs.
In medical terms, the right choice depends on many factors such as eye health, refractive status, and lifestyle.
Epidemiology of astigmatism
According to studies of different age groups, the prevalence of astigmatism in adults ranges from approximately 30% to 60%, and the proportion is higher in the elderly. Only about 82% of reports indicate that patients have mild astigmatism.
As we age, the prevalence of astigmatism may increase due to various factors, such as changes in the curvature of the eyeball.
According to one study, many children develop astigmatism between the ages of five and seventeen, and the incidence of gusts decreases significantly between early childhood and four years, before remaining stable in adulthood.
Historical causes of astigmatism
The scientific understanding of astigmatism began in the early 19th century, and was first proposed by scientist Thomas Young in 1801. As this concept continues to deepen, many subsequent studies are exploring its causes and solutions.
The concept of astigmatism has developed into an important part of modern ophthalmology, and many advanced technologies and treatments have been developed.
Today, astigmatism is a common vision problem that affects the quality of life of millions of people. The advancement of science and technology has undoubtedly provided more possibilities for solving this problem. So, do you know your own eye health?
