Main
- Astigmatism — uneven curvature of the cornea or lens, causing light to focus at several points rather than one.
- Symptoms: blurred outlines at any distance, double letters, rapid eye fatigue, headaches and a habit of squinting.
- Causes: heredity, eye injuries and surgery, keratoconus, age-related changes of the lens.
- Diagnosis: visual acuity testing with charts, refractometry, keratometry, corneal topography, and cycloscopy in children.
- Treatment: selection of glasses or lenses, laser correction and lens implantation as indicated, regular follow-up with an ophthalmologist.
What is astigmatism
Astigmatism is a condition in which the cornea or lens of the eye has an irregular shape, causing the image on the retina to be unclear. A person may see objects distorted or blurred at any distance.
What happens in the body
The cornea of a healthy eye has a smooth spherical surface, resembling half a ball, and refracts light equally in all directions. In astigmatism, the curvature of the cornea or lens is uneven: along one axis it is stronger, along another weaker. Because of this, rays of light entering the eye focus not at a single point on the retina, but at several points located at different distances. The image appears blurred or stretched, and the person notices that letters appear double and straight lines seem slanted. This is especially noticeable when looking at contrasting objects: signs, a screen, road signs. The brain tries to adapt to the distorted picture, so the eyes tire more quickly when reading and working at a computer. If the distortion is pronounced, the person involuntarily squints to improve clarity at least a little. Persistent eye strain is worth noticing and discussing with a specialist, rather than putting it down to ordinary tiredness.
What causes it to develop
- Hereditary predisposition: the shape of the cornea and lens is genetically determined, so if parents have astigmatism, the risk of passing it on to children is noticeably higher.
- Injuries or eye surgery: mechanical damage or surgical intervention can change the curvature of the cornea and disrupt its previously even shape.
- Corneal diseases: in keratoconus, the cornea gradually thins and bulges into a cone, causing its surface to cease being regular.
- Age-related changes of the lens: over the years, the lens changes in density and shape, which can also affect the evenness of light refraction.
- Practical conclusion: if relatives wear glasses for distorted vision, it is worth having children's eyes checked too, since early detection makes it easier to select correction.
Who encounters this more often
Astigmatism occurs in people of any age, but it is most often detected in children and adolescents, when vision is actively developing. A hereditary feature of the eye's structure is the most common cause, so a child whose parents wear glasses has a higher chance of encountering this condition. Ordinary situations help to notice the problem: a schoolchild squints at the blackboard, complains of a headache after lessons, or brings a book too close to the face. In adults, distorted vision is often discovered by chance, during a routine check-up, because the person gets used to the blurred picture and considers it normal. Injuries, previous operations and corneal diseases also increase the likelihood, but occur less often than the hereditary factor. Age-related changes of the lens add risk for older people, whose vision changes gradually. If a loved one constantly squints or complains of blurry objects, it is reasonable to suggest they have their vision checked by a specialist.
What symptoms can occur?
Astigmatism manifests in different ways: from mild blurring to noticeable distortion of vision. Often a person does not suspect a problem until it interferes with reading or driving.
How it is noticed at the very beginning
At the beginning, astigmatism often looks like ordinary eye fatigue after a working day. A person notices that the letters in a book or on a screen blur by the evening, and by the morning vision seems normal again. Many attribute this to lack of sleep, long hours at the computer or poor lighting in the room. At the same time, one has to squint to make out the bus number or small print in a document. Gradually the strain accumulates, and by the end of the day headaches, heaviness in the eyes and a desire to rub them appear. If such signs repeat day after day, it is worth booking a routine appointment with an ophthalmologist. An examination helps to understand whether these sensations are related to astigmatism or to another cause.
Signs that occur most often
- Blurred vision: the outlines of objects lose sharpness at any distance, and this makes it difficult to recognise faces and read signs.
- Distortion of the image: straight lines appear curved, and letters in a text seem to overlap each other when reading.
- Rapid eye fatigue: when reading or working at a computer, the eyes tire noticeably faster than usual, and one wants to take a break.
- Headaches and strain: after visual strain the head aches, and heaviness appears in the eyes and in the bridge of the nose area.
- Squinting: a person involuntarily squints to make out small details or distant objects.
- Difficulty with small details: it is hard to distinguish small print, thin lines and other small elements.
When to seek help urgently
Examinations and tests
An ophthalmologist performs the examination for astigmatism and begins with a vision acuity test. Then the doctor assesses the shape and refractive power of the cornea and lens using special investigations.
How the examination begins
The examination begins with a vision acuity test using charts, and this is the first step for an obvious reason. The patient names signs of different sizes, and the doctor records which lines they can distinguish without correction and with it. Such a test shows how much vision is reduced, but does not explain the cause of the distortion. The ophthalmologist then moves on to refractometry to determine the degree of astigmatism and the position of the principal meridians. Additionally, keratometry is performed, and if necessary, corneal topography to assess its shape. In children, cycloscopy is used to clarify refraction, since their eye muscles are more tense. If you come to the appointment with ready-made reports from previous examinations, the doctor will be able to compare the values and more accurately assess the changes.
What is prescribed and what it shows
What is worth preparing for the appointment
- Reports from previous examinations: they show the dynamics of the values and help the doctor assess how vision has changed over time.
- Results of previous investigations: refractometry and keratometry data provide a reference point for comparison with current measurements.
- Glasses or contact lenses: take them with you so that the doctor can check how well the correction matches your values.
- Observations about your vision: write down when and under what conditions you notice blurriness or double vision.
- List of questions: formulate in advance what you want to clarify with the ophthalmologist so that you do not forget anything at the appointment.
Which doctor should I see?
This section explains which doctor to consult for astigmatism, what happens at the first appointment and what areas make up the care. It will help you choose a specialist and understand what the result of monitoring depends on.
Which specialist manages this condition
Astigmatism is managed by an ophthalmologist, and it is to them that patients are referred when distorted vision is suspected. The doctor checks visual acuity, determines the degree and type of astigmatism, and assesses the condition of the cornea and lens. At the first appointment, they clarify the complaints, gather information about past diseases and eye injuries, and look at family history. If there is no specialised ophthalmologist nearby, you can start with an appointment with a general practitioner: they will assess the situation and refer you further to the relevant specialist. Some cases are detected incidentally, during a routine examination, when the person has no complaints and considers their vision normal. In that case, it is the ophthalmologist who decides whether correction is needed now or whether monitoring with check-ups is sufficient. Do not postpone the visit if your vision has worsened or you have developed rapid fatigue when reading and working at a screen.
What treatment consists of
- Selection of glasses or contact lenses: the doctor selects optical correction based on the examination results in order to correct the distortion and restore clear vision near and far.
- Laser vision correction: the method is used for certain indications, when the structure of the eye and the condition of the cornea allow the procedure to be performed without risk.
- Implantation of special lenses: an option for high degrees of astigmatism, when other methods of correction do not provide the required quality of vision.
- Monitoring by an ophthalmologist: regular check-ups are needed in order to notice changes in time and adjust the chosen method of care.
- Choice of method: the decision depends on the degree of astigmatism, age and concomitant diseases, so the approach is determined individually.
What depends on the patient themselves
The result largely depends on the regularity of monitoring and precise adherence to the ophthalmologist's recommendations. If planned check-ups are missed, changes in vision may be noticed late, when the usual correction no longer provides the former clarity. Wearing glasses or lenses with the prescribed parameters is important for the everyday strain on the eyes, especially when reading and working at a screen. If discomfort, blurriness or fatigue appears, you should tell the doctor about it rather than change the optical correction yourself. Records of past check-ups help the ophthalmologist see the dynamics and select further steps more accurately. The patient also influences how soon they seek help when their condition worsens, because an early visit makes selecting correction easier. Following these simple rules makes monitoring predictable and reduces the risk of advanced changes in vision.
What helps prevent an exacerbation?
Astigmatism cannot be completely prevented, but the risk of exacerbation and deterioration of vision can be reduced. For this, daily habits, regular check-ups with an ophthalmologist and attention to one's own condition are important.
What is changed in habits
The visual regime during exertion directly affects the course of astigmatism and the general well-being of the eyes. During prolonged work at a computer or with documents, the eye muscles become overstrained, fatigue, blurriness and headache appear. To reduce the load, it is useful to take breaks and switch the gaze to distant objects. The lighting of the workplace should be sufficient, but not blinding, and the screen should be positioned slightly below eye level. Protecting the eyes from injuries is especially important during sports, at work and during repairs. Timely treatment of other eye diseases helps to prevent additional strain on the weakened optical system. If persistent fatigue has appeared or vision has become worse, it is worth discussing this with an ophthalmologist rather than changing habits on one's own.
What should be kept under control
- Regular examinations by an ophthalmologist: routine check-ups help to notice changes in time and correct vision, even if there are no complaints yet.
- Visual regime during exertion: alternating work and rest for the eyes reduces overstrain, which intensifies discomfort and blurriness.
- Protecting the eyes from injuries: glasses and other protective equipment reduce the risk of damage that could worsen the condition of the optical system.
- Treatment of other eye diseases: timely help with concomitant problems prevents them from additionally affecting vision.
- One's own sensations: the appearance of persistent fatigue, headache or blurriness serves as a reason to discuss this with a doctor.
How often to see a doctor
Regular check-ups with an ophthalmologist are needed even with good well-being, because astigmatism can change imperceptibly. There is no specific prevention of this condition, especially if it is hereditary, so examinations remain the main way to notice shifts in time. At an appointment, the doctor checks visual acuity and, if necessary, corrects it, which helps to maintain comfort in everyday life. If new complaints have appeared, for example blurriness or rapid eye fatigue, the visit should not be postponed. With a stable condition, routine check-ups are sufficient, the frequency of which is determined by the doctor taking into account individual characteristics. Such an approach does not replace the prescribed treatment, but helps to keep the situation under control. Record your observations of your vision and discuss them at the appointment — this makes control more accurate.
What is worth remembering
A conversation about astigmatism comes down to a few simple ideas that are worth keeping in mind. Below is the main thing that helps you make a calm and considered decision.
Key takeaways
Astigmatism is a feature of the structure of the eye in which light is focused incorrectly, and on its own it does not go away. It can be noticed by the blurred outlines of objects, rapid eye fatigue and the urge to squint in order to make something out. Many people for years put such sensations down to tiredness and postpone a visit to a specialist, although it is precisely time that works against a person here. Astigmatism is often combined with short-sightedness or long-sightedness, so vision needs to be assessed as a whole, and not by a single sign. Only a doctor can work out what exactly is happening with the eyes, after an examination and a vision test. Self-checking with charts and advice from the internet often leads you astray and prevents you from getting help in time. If astigmatism is detected in a child, calm and consistent monitoring by a specialist is especially important. An adult should rely on regular vision checks, and not on their own guesses about the causes of the discomfort.
