What Causes Astigmatism?
Astigmatism can be present from birth or develop over time. The exact cause isn’t fully understood, but genetics often play a role, so if you have astigmatism, there’s a chance your children might as well. Other factors can also influence astigmatism, such as eye injuries, surgeries, or conditions that change the cornea’s shape.
Most people with astigmatism also have other refractive errors, like myopia (shortsightedness) or hyperopia (farsightedness). Astigmatism is common enough that many people don’t realize they have it until they have an eye test, as mild cases can go unnoticed or be mistaken for general blurriness.
Why Changes in Astigmatism Matter
While astigmatism itself is common, treatable, and not serious, a change in astigmatism can sometimes indicate underlying eye conditions. For example:
Cataracts: As the lens inside the eye becomes clouded, it can change the eye’s refractive power, sometimes altering the level of astigmatism.
Keratoconus: This condition causes the cornea to thin and bulge outward, leading to progressive and often irregular astigmatism, which can make regular glasses or contacts less effective.
Regular eye exams are essential for monitoring prescription changes and overall eye health. If you notice a sudden change in vision or discomfort with your usual prescription, it’s wise to get it checked, as this could be an early sign of changes in eye health.
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