What is Astigmatism (also known as “san guang”)?
Astigmatism (a.k.a. san guang) is a type of eye disorder in which refractive errors in the eye causes blurred vision. This condition requires immediate adjustment and can be corrected with eyeglasses, surgery or even contact lenses.
Regular or irregular astigmatism is also a classification of astigmatism. Regular astigmatism is the most common type of astigmatism and happens when the principal meridians are perpendicular to each other.
On the other hand, Irregular astigmatism happens when the perpendicular meridians are not perpendicular to each other. Most people are born with some degree of astigmatism, however not everyone with astigmatism requires corrective eyeglasses.
Causes of Astigmatism
Astigmatism is caused when the cornea is abnormally curved. This makes it more difficult for the eyes to focus light, causing the images that are seen on the retina appear dim and blurry.
Astigmatism is one of the most common eye disorders, that affects 20%-30% of the Singapore population. The causes of astigmatism are unknown, however, eye specialists believe it could be hereditary. Patients suffering from astigmatism can be diagnosed using any standard eye test or refraction test. In most cases, special tests are not necessary, unless there are complications involving other eye conditions such as cataract or glaucoma.
Symptoms of Astigmatism
The most obvious symptoms of astigmatism are difficulty in seeing fine print, either from a distance or close-up. Blurring, difficulty focusing, difficulty reading near or far without squinting, eye strain, eye pain or headaches, are also common symptoms of astigmatism and should be corrected promptly.
Treating Astigmatism with LASIK
Astigmatism can be corrected using LASIK, a type of refractive surgery that uses laser to reshape the cornea. To learn more about LASIK, contact ClearVision using the enquiry form below: