Can nearsightedness with astigmatism be corrected with contact lenses?
Jun 29, 2022
Source: Cainiu Health
Dr. Chen You
Introduction
Myopic astigmatism can be corrected with contact lenses. Simple spherical lenses do not induce astigmatism; when astigmatism is minimal, it is often converted to an equivalent spherical prescription for wear—though this approach does not yield optimal image quality. Additionally, toric (astigmatism-correcting) contact lenses are available, but their prescription conversion is typically more complex than for simple myopia. In general, astigmatism measurements obtained during refraction are intended for use with spectacles.
Many people today prefer contact lenses due to their convenience. However, individuals with myopia and astigmatism often wonder whether they can wear contact lenses. So, can people with myopia and astigmatism wear contact lenses?
Can people with myopia and astigmatism wear contact lenses?
Yes, individuals with myopia and astigmatism can wear contact lenses. Simple spherical lenses do not induce additional astigmatism; when astigmatism is minimal, it is often converted into an equivalent spherical prescription for lens fitting. However, this approach does not yield optimal visual acuity. Alternatively, toric (astigmatism-correcting) contact lenses are available, though the prescription conversion process is more complex than for simple myopia. Generally, refractive measurements for astigmatism are taken for eyeglasses, and these values must be adjusted for contact lens use. The key distinction between these two prescriptions lies in the fact that newly fitted contact lenses for astigmatism require custom toric lens parameters. Therefore, as long as the conversion is performed accurately, custom contact lenses can be prescribed for individuals with myopia and astigmatism.
Patients should ensure adequate lighting while reading, watching television, or using a computer. Insufficient lighting not only impairs visual clarity but also adversely affects eye health, leading to excessive eye strain and potentially contributing to the development or progression of astigmatism. When reading, the distance between the book and the eyes should neither be too great nor too close—ideally maintained at approximately 30 cm. Additionally, desk and chair heights should be appropriately matched to the individual’s stature. This promotes comfort and helps reduce ocular fatigue, thereby preventing refractive errors such as astigmatism.
In daily life, patients should adhere to the principle of “prevention first, combining prevention and treatment,” ensuring adequate rest for the eyes and cultivating consistent eye-protective habits. We hope this information is helpful to you.
