"Doctor, I have always been unable to see clearly recently. Is it presbyopia or cataract ?" Many patients in the outpatient clinic have such questions. In fact, cataracts, presbyopia and astigmatism also have symptoms of blurred vision, but in fact, there are big differences from the cause of formation to the treatment method.
causes of formation
Presbyopia: is a normal aging phenomenon. As you age, the eyes look at close objects for a long time, and the ciliary muscle continues to contract. Finally, the ciliary muscle function declines and becomes numb, and the adjustment ability required to look at close objects is lost. The refractive regulation function of the eyes becomes weak, which leads to symptoms of unclear vision at close range. However, it should be noted that presbyopia may arrive early. If you keep a close eye on 3C products for a long time, it will easily cause ciliary muscle fatigue, and presbyopia will come to you.
Cataract: is mainly caused by turbidity in the crystal, which prevents light from entering and reaching the retina for imaging, causing the patient to feel unable to see clearly, affecting the vision of close and far. There are many reasons for cataracts, which may be caused by congenital influence on the fetus; it may also be acquired such as trauma, inflammation, high myopia, diabetes , and more of "senile cataracts".
Astigmatism: Astigmatism is a congenital problem. As long as the sphere of the eye is not round, when the light enters the eyeball, it will not focus into a single point, but a dispersed image, it is called astigmatism. Astigmatism can cause blurred vision and overlapping shadows. There will be glare when watching the light, or a lamp will radiate into three or four halos. The eyes will also cause the ciliary muscles to exert force because they want to see the object clearly, which is prone to visual fatigue.
The blurred distance of the vision is different
Presential: Patients with presbyopia can only see objects in distant places, but cannot see objects in myopia clearly. Therefore, the degree of presbyopia is the ability to measure the eye's ability to adjust appropriately when it is close to "33 cm away from the object".
Cataract: Cataracts are mainly caused by turbidity in the crystal. Not seeing clearly is the main symptom of cataracts. Because the crystal becomes turbid, the patient cannot see clearly whether it is close or far, and may not see clearly during the day or at night. This is different from presbyopia only looking close and not clearly. If cataract disease develops in the later stage, it may lead to blindness and is extremely harmful.
Astigmatism: has astigmatism cornea, which has a surface like a rugby, and its refractive power in each direction is different. Therefore, after the light is refracted by this cornea, the focus points of light in each direction fall in different places, and cannot be concentrated into a clear image, resulting in no matter how far you look, it is unclear.
treatment methods are different
Presbyopia: The common presbyopia correction method is to wear presbyopia glasses, or multi-focus lenses, while taking into account both the distance and the near. With the development of medical technology, presbyopia can now be treated through surgery and implanted with artificial crystals. It is a good choice for middle-aged and elderly people who have presbyopia, cataracts or myopia at the same time.
Cataract: cataract cannot be solved through glasses. At present, the treatment of cataracts is still mainly based on surgery. Due to the advancement of instruments and equipment, cataracts are no longer as difficult as they were 20 years ago. Now the surgery is only a few dozen minutes, and you will not be hospitalized. The implanted artificial crystal has very good material and visual correction effect. As for when the operation is suitable, it depends entirely on the patient's decision.
Astigmatism: When there is astigmatism problem, you should wear suitable glasses to protect your eyes; in addition to glasses, laser surgery can also treat astigmatism. The distribution of astigmatism on the cornea can be calculated by using the corneal graph, and then laser surgery is used for correction. In addition, implanting astigmatism artificial crystals is also an effective solution to astigmatism.
