Difference Between Astigmatism and Myopia: Symptoms, Causes and Solutions
When it comes to visual defects, myopia and astigmatism are among the most common. Sometimes they occur together, sometimes in isolation, but they are often confused or interpreted as similar conditions. Understanding the The difference between astigmatism and myopia is essential to choose the right ophthalmic lenses, recognize the symptoms and intervene with effective visual correction.
Myopia: what it is and how it affects vision
Myopia is a refractive defect that involves difficulty in distance vision. Distant objects appear blurry, while nearby objects are generally sharp. This happens when the eye is longer than normal or the curvature of the cornea is too pronounced: the light rays focus in front of the retina instead of on it.
Who it affects and when it occurs
Myopia usually develops between the ages of 5 and 16 and tends to increase during adolescence, and then stabilize around the age of 18-20. It is more frequent in children who spend many hours indoors, especially in front of digital screens or books, and less time outdoors. It is important to monitor for any worsening, as unmanaged myopia can negatively affect quality of life.
How to recognize it
The main symptoms include difficulty seeing distant objects clearly, visual fatigue when driving or viewing the whiteboard, headaches, and the need to squint to focus. In the long term, myopia can also increase the risk of certain eye diseases.
Astigmatism: causes and symptoms
Astigmatism is a visual defect related to the irregular shape of the cornea or lens. Instead of having a uniform spherical curvature, the surface of the astigmatic eye has an elliptical curvature that alters the focus of the images.
Because it looks blurry at all distances
Unlike myopia, astigmatism causes distorted or blurry vision both near and far. The image forms in multiple places on the retina, which can lead to visual confusion, reduced sharpness, and eye strain.
Symptoms not to be underestimated
Headaches, double vision, tired or red eyes, difficulty reading and concentrating are typical signs of astigmatism. Sometimes it can be present without obvious symptoms, which is why it is important to perform regular eye checks.
The main differences between astigmatism and myopia
The two conditions have distinct effects on vision and require different optical corrections. The most effective way to distinguish between myopia and astigmatism is a visit with a refractive examination by a professional.
Origin of the defect
Myopia depends on the excessive length of the eyeball or an accentuated curvature of the cornea. Astigmatism, on the other hand, is caused by an irregular curvature of the cornea or lens.
Effects on vision
Myopia affects distance vision. Astigmatism can impair vision in all distances and reduce sharpness, making it difficult to distinguish details.
Daily events
A nearsighted person can read without difficulty but has trouble recognizing road signs or distant faces. An astigmatic person may have difficulty both reading and seeing at a distance, especially in conditions of low light or after hours of close-up visual work.
Can they coexist in the same eye?
Yes, and it’s pretty common. Myopia and astigmatism can overlap and manifest themselves simultaneously, creating a more complex refractive framework. In these cases, the eye prescription takes into account both components, and modern ophthalmic lenses are able to correct them with a single personalized visual support.
The right optical solutions
The choice of lens depends on the severity and combination of visual defects. Today, there are personalized lenses that respond effectively to both myopia and astigmatism.
Single vision and toric lenses
Single vision lenses are used for simple myopia correction, while toric lenses are used They are designed for astigmatism. If the two defects coexist, recourse is made to combined lenses that integrate both refractive powers.
Progressive lenses for adult astigmatics
In adults who are also beginning to experience the first signs of presbyopia, progressive lenses may include correction for nearsightedness, astigmatism, and near vision, allowing for a smooth transition between distances.
