What is astigmatism?
The eye is like a round ball. Light from the cornea enters the eye and reaches the retina after the lens. But in the eyes of the astigmatites, the eye looks like a basketball or behind a spoon and the light reaches the retina from one side to the other, and this will blur the eye. This means that focus is only on the part of the eye. The more distance the object is, the more the body becomes more blurry.
Signs of astigmatism
Signs and symptoms of astigmatism may include:
Stress or discomfort
The difficulty of seeing at night
Types of astigmatism
There are two types of astigmatism. Both types of astigmatism create blurred vision. Blurred vision may be more in one direction, or horizontally, vertically or diagonally. Astigmatism may exist from birth or may develop after eye injury, disease or surgery. Astigmatism becomes worse when reading in poor light, sitting too far behind a computer or TV.
Corneal astigma corneal astigmatism
This astigmatis occurs when your cornea is tired.
2. Lensic astigmatism (lenticular astigmatism)
This type of astigma is due to the fatigue of your eye lens.
Reasons for eye astigmatism
Refractive error error
If both cornea and lens of your eye are incompatible and inappropriate, the light rays do not bend properly and cause refractive errors. This creates a vague image. Astigmatism is a kind of refractive error.
If the cornea has contradictory curves, you have corneal astigmatism and you have lensic astigmatism if your lens or lens has contradictory curves.
Other refractive errors
Astigmatism may occur in combination with other refractive errors, including:
This happens when your cornea is too curved. Instead of focusing exactly on your retina, the light is centered around your retina and the objects look or appear blurred or blurred.
This happens when your cornea is too curvy or your eyesight is shorter than normal. Opposite effect is myopia. In this case, the image of objects is reflected behind the eye.
Astigmatism detection method
Astigmatism is diagnosed by eye examination. The ophthalmologist may use different diagnostic tools.
The keratinometer is one of these devices. By measuring the amount of light reflected, the doctor measures the amount of astigmatism.
Keratoscope: This device measures the amount of corneal curvature.
After that, it will put glasses in your eyes where the glass is interchangeable. The doctor measures you with the help of eye glasses.
Treatment for astigmatism
Treatment for astigmatism is an improvement in visual clarity. Treatments include:
Surgery for fixing refractive errors
Using corrective lenses, astigmatism is treated by coordinating the rugged curves of the cornea and lens. Types of corrective lenses include:
Note: Long-term use of eye lenses increases the risk of infection.
2- Astigmatism surgery
Surgery Astgimat has several types that include:
LASIK LASIK action
This is a keratoconus or lysic cut procedure. LASIC stands for Laser-assisted in-situ keratomileusis, which has long been used to treat corneal diseases. In this type of laser surgery, a flap is created on the cornea. Then the first layer is pulled off and the laser shifted to the bottom of the layer to curvature it.
LASEK LASKET operation
The acronym for the Laser-Assisted Subepithelial Keratectomy is a cut of the cornea called epithelium. Instead of creating a flap in the cornea, the surgeon throws a thin corneal protective coating (epithelium) using an alcohol-soluble device, this layer attaches to the device and allows the surgeon to reach the cornea and correct the curvature.
Phototherapy keratothectomy (PRK)
The abbreviation for this technique is photorefractive keratectomy. This method is similar to LASEK, the difference is that the surgeon completely removes the epithelium layer until it reestablishes naturally.
Surgical side effects
Adverse effects such as creating a halo or seeing a star that appears around the lights
Rarely, loss of vision
Factors that increase the risk of astigmatism
Events that affect the eye
Corneal congenital defects