Blurred vision might be caused by series of risk factors, including astigmatism. This is an eye condition wherein blurred vision is the most-frequent occurring symptom. In fact, this eye problem is quite common and does not usually cause harmful complications to the affected eye other than the distorted vision or blurred imaging. Despite this, proper treatments for astigmatism is essential, as left untreated, this vision problem may lead to severe headaches, nausea, and tiredness after a long activity involving eye focusing.
What causes astigmatism?
In fact, astigmatism is common in either adults or children. This vision abnormality is mainly caused by the abnormal anatomy of the eye, especially the shape of the cornea or the eye lens. The cornea itself is the transparent layer of tissue, which is visible at the front part of the eye. In general, humans have got football-shaped cornea, which perfectly focuses the eye sight, so that objects far or close to the eyes can be properly reflected. Some people, however, possess a cornea, which shapes similarly to a rugby ball, instead. As a result, reflected images cannot be fully perceived properly.
The amount of light coming into the cornea makes all this possible. When your cornea has a similar shape to a football, it will let sufficient light come into and out of the eyes, reflecting images far and near you clearly and properly. When this cornea is not perfectly shaped, however, the amount of light coming into the eye is not enough to reflect images properly. As a result, these images are perceived blurry.
In addition to the irregular shape of the eye cornea, there are some others possible risk factors causing astigmatism in people, such as:
- Injuries that cause scar to the cornea.
- Eye conditions that trigger changes to the cornea, such as the bulging of the cornea, thinning cornea, and reshaped cornea.
- Injuries to the eyelids that distort the position and thus, shape of the cornea.
- Drastic changes to the cornea triggered by eye surgery.
Activities that may trigger astigmatism
People with astigmatism eye condition possess irregular shape of cornea that let slightly different amount of light go into the eye from those eyes with normal cornea shape. This condition is caused by several risk factors mentioned previously. If you are suffering from astigmatism, it will be difficult for you to see objects near or far from you clearly, as this less amount of light cause image distortion that triggers blurred vision. Astigmatism does not commonly cause any worse eye complications and in most cases, does not lead to loss of vision. However, some activities and late treatments may cause some unpleasant conditions related to the existence of astigmatism in an individual.
Activities that require prolonged focusing of the eye lens may trigger side effects of astigmatism, such as migraine, nausea, or fatigue. Hence, people with astigmatism tend to experience severe headache or nausea when they read for too long or focus on work with computer without resting. Therefore, it is advised that people with frequent blurry visions as a sign of astigmatism take some interval breaks during these long-focusing activities, such as reading or working with computer. Wearing contact lenses or glasses that help with astigmatism may also decrease the risk of triggering the occurring of blurry vision during the activities.
Does genetic cause astigmatism?
Astigmatism may present at birth, but may also develop later in life, especially if the person undergoes trauma or injuries to the eye that affects the cornea. However, hereditary is also known as a big factor related to the development of astigmatism, especially in children. Thus, a person may be more prone to this irregular cornea shaping if:
- They have a family history of astigmatism or other kinds of eye disorders, such as keratoconus, or cornea degeneration.
- They have a history of excessive eye surgery, which affects the cornea or other parts of the eye related to the eye lens.
- They have a history of trauma, illness, or injuries to the eye area that affects the cornea.
- They have ever experienced scarring to the cornea or thinning to this area that affects the way your lens receive external light for image perceiving.