Can individuals with astigmatism wear myopia (nearsightedness) glasses?
Jun 29, 2022
Source: Cainiu Health
Dr. Chen You
Introduction
Individuals with astigmatism cannot wear myopic (nearsighted) glasses alone. Astigmatism arises from an irregular corneal curvature, causing parallel light rays entering the eye and passing through the cornea to fail to focus properly on the retina. Corrective lenses specifically designed to address astigmatism are therefore required. In contrast, myopia results from an elongated axial length of the eye, and corrective lenses are used to compensate for this abnormal eye length. Typically, concave lenses are prescribed for myopia, while convex lenses are prescribed for hyperopia.
Astigmatism is one of the three types of refractive errors—and a serious one at that—significantly affecting visual quality. It arises because the entire optical system of the eye is not perfectly spherical but rather irregularly curved. Other ocular structures—including the lens, aqueous humor, and vitreous body—also contribute to overall refraction. So, can individuals with astigmatism wear myopic (nearsighted) glasses?
Can individuals with astigmatism wear myopic glasses?
No, individuals with astigmatism should not wear standard myopic glasses alone. Astigmatism results from an irregular corneal curvature, causing parallel light rays entering the eye through the cornea to fail to focus properly onto the retina. Corrective lenses specifically designed for astigmatism are required to address this issue. In contrast, myopia stems from an elongated axial length of the eye; correction typically involves concave lenses. Specifically: myopia requires minus (concave) lenses; hyperopia requires plus (convex) lenses; and astigmatism necessitates cylindrical (toric) lenses. When myopia or hyperopia coexists with astigmatism, combined prescription lenses—such as myopic-astigmatic or hyperopic-astigmatic lenses—are required.
Ensure adequate lighting when reading, watching television, or using a computer. Insufficient illumination not only impairs visibility but also adversely affects ocular health, leading to excessive eye strain and potentially worsening or even inducing astigmatism. Prolonged or excessive use of the eyes inevitably causes visual fatigue, thereby increasing the risk of developing or exacerbating astigmatism. Therefore, in daily life, it is essential to avoid extended periods of near work. Whether watching TV or reading, limit continuous activity to no more than 30 minutes before taking a brief rest.
In daily life, cultivate healthy lifestyle and dietary habits. We hope this information proves helpful to you.
