Symptoms of corneal curvature: 4 signs explained by Doctor-medic Bányai
The typical symptoms of corneal curvature (astigmatism) are distorted or blurred vision, persistent headaches, eye pain and dizziness during prolonged screen work or while reading. Around 40 to 80 percent of all people have a corneal curvature of varying degrees, although mild forms often go unnoticed, as the eye can compensate for small deviations itself.
Doctor-medic Liliana Bányai, ophthalmologist and eye laser specialist at Bányai Neue Augen in Stuttgart and Karlsruhe, explains in this article which complaints specifically indicate astigmatism, how strongly the symptoms depend on the severity of the corneal curvature and when an ophthalmologist appointment makes sense.
These 4 symptoms occur in astigmatism (intentionality)
Corneal Curvature Symptoms at a Glance
- Distorted or blurred vision (objects appear stretched or blurred, near and far at the same time)
- Headaches (especially after prolonged reading, screen work or driving)
- Eye pain and eye fatigue (the eye tries to compensate for the blur by constantly tensing the ciliary muscles)
- Dizziness (often occurs with severe astigmatism or rapid changes in the direction of view)
In the case of mild astigmatism, the affected person often does not perceive any visual impairment at all. Most people have a slightly curved cornea, as the eye is not naturally perfect. A corneal curvature of up to about 0.75 dioptres can usually be compensated by the eye itself and does not need to be corrected.
With more severe corneal curvature, vision near and far is distorted. Round objects can appear stretched and rod-shaped (hence the term intentionality).
Why do these complaints arise?
In a corneal curvature, the cornea does not focus incident light on a single point of the retina, but on several focal points at the same time. The result is a permanently blurred or distorted image. The eye tries to compensate for this blur by continuously tensing the ciliary muscles (accommodation). This persistent muscle tension leads to fatigue, eye pain and headaches.
Especially with mild astigmatism, which the eye can still partially compensate for, this compensation effort is high. A cross-sectional clinical study with 2,157 participants showed that astigmatism is significantly more common in people with headaches than in the symptom-free control group. As a mechanism, the authors identified the overactivation of the ciliary muscles and the associated irritation of the ophthalmic nerve (a branch of the trigeminal nerve).¹
If these symptoms occur, an ophthalmologist’s appointment should be arranged. Our non-binding onlineastigmatism test can provide initial clues.
Corneal Curvature Symptoms in Children
Children with astigmatism rarely complain of blurred vision because they know no comparison to sharp vision. Instead, the symptoms are often indirect: head tilting while reading, frequent winking or blinking, school difficulties despite normal intelligence, or complaining of headaches after class.
A study from Hong Kong with 418 primary school children (8–11 years) showed that 46.5 percent of the children studied had an astigmatism of at least 0.75 dioptres. The authors found that less time outdoors and more close-up work (screen, reading) were associated with higher astigmatism prevalence and greater axis elongation of the eye.² A regular eye examination in childhood is therefore important in order to detect undetected corneal curvature at an early stage and to prevent deterioration of vision.
What types of corneal curvature are there?
Ophthalmologists generally distinguish between regular astigmatism (most common form, uniform curvature deviation in one axis) and irregular astigmatism (rarer form, for example after injuries or in the eye disease keratoconus). All forms with their differences and the most common causes of corneal curvature are explained in detail in the overview article.
Who makes the diagnosis of a corneal curvature?
The diagnosis is made by an ophthalmologist or optician using an eye test as well as modern surveying equipment such as the corneal topographer, with which the corneal surface is precisely mapped. We explain in detail what the measured corneal curvature values mean. Since blurred vision can also have other causes, a specialist examination is always recommended if the symptoms persist.
How can astigmatism be treated?
The most common treatment routes are toric spectacle lenses and contact lenses with cylinder correction as well as permanent laser correction of the cornea. All options, advantages and disadvantages as well as the prerequisites for laser surgery are explained in detail in the article on the treatment of corneal curvature.
Can my eyes be lasered?
Laser eye surgery as a permanent solution
If there is a severe astigmatism, it may be useful to have the corneal curvature lasered. For this, the patient’s eye is numbed with special eye drops so that no pain occurs during the operation. More detailed information on laser eye surgery can be found in the laser eye experience report.
Which method is used to correct the corneal curvature depends on the nature of the eye and the personal circumstances of life. The ophthalmologist decides which method is suitable for which patient.
Glasses or contact lenses can be used to correct vision in the event of a corneal curvature. Laser correction is the proven option for a permanent solution without a visual aid.
Treating corneal curvature at Bányai Neue Augen in Stuttgart and Karlsruhe
Bányai Neue Augen specialises in the diagnosis and treatment of corneal curvature. The team led by Dr. med. Daniel Bányai and doctor-medic Liliana Bányai has 28 years of experience and has performed more than 51,000 eye treatments.
Whether visual aids or permanent laser correction: In a personal consultation, we analyse your individual corneal situation and recommend the appropriate treatment for you. With over 3,000 procedures per year, Bányai Neue Augen is one of the most experienced eye laser centres in Baden-Württemberg.
Frequently asked questions about the symptoms of corneal curvature
Typical indications are distorted vision, in which round objects appear stretched or oval, persistent headaches after screen work, and eye fatigue without any other identifiable cause. Unlike pure nearsightedness or farsightedness, blurring in astigmatism often affects near and far at the same time. An eye test at the ophthalmologist or optician provides certainty, as only a measurement can determine the strength and type of curvature.
Yes, corneal curvature often occurs from birth. However, children do not always show the symptoms clearly, as they do not know how to compare sharp vision. Clues may include frequent winking, tilting your head while reading, or complaining of headaches after school. An ophthalmological examination in childhood can reveal undetected corneal curvature and prevent deterioration of vision.
Dizziness alone is not a sure sign of astigmatism, as it has many possible causes. However, associated with blurred vision and eye pain, it may indicate uncompensated corneal curvature, especially if dizziness occurs after prolonged screen or reading use. If symptoms persist, an ophthalmologist should be consulted for clarification.
If symptoms such as blurred vision, regular headaches or eye fatigue occur in everyday life, an ophthalmologist appointment makes sense. The earlier a corneal curvature is diagnosed, the better it can be compensated for with suitable visual aids or laser correction. At Bányai Neue Augen in Stuttgart and Karlsruhe, you can arrange a non-binding consultation.
A corneal curvature is stable in most cases, as it is usually congenital. In rare cases, such as the eye disease keratoconus, the cornea can become progressively thinner, which intensifies the symptoms. Laser correction is also possible for thin corneas under certain conditions. A significant increase in curvature is rather unusual and should be clarified by an ophthalmologist.
References
¹ Wajuihian SO (2024). Exploring Correlations between Headaches and Refractive Errors in an Optometry Clinic Sample. PubMed Central. PMID 38187096.
² Wong SC, Kee CS, Leung TW (2022). High Prevalence of Astigmatism in Children after School Suspension during the COVID-19 Pandemic Is Associated with Axial Elongation. Children (Basel). PMID 35740857.
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