What is the principle of half femtosecond surgery in Shanghai Hospital?
Half femtosecond surgery in Shanghai Hospital is a common vision correction surgery, which can effectively improve myopia, hyperopia, astigmatism and other eye problems. So, how does it work? The principle of half femtosecond surgery in Shanghai Hospital is described in detail from four aspects.
Corneal correction
Half femtosecond surgery corrects the cornea by laser to change the focus of the eye, so as to achieve the purpose of vision correction. Before surgery, the doctor will first measure the cornea to determine the position and degree to be corrected. During surgery, the patient's eyes will be fixed, and then the laser will generate a tiny incision on the cornea through the pre calculated parameters. These incisions will cause slight deformation of the cornea to correct myopia, hyperopia and astigmatism.
During the operation, the laser will scan the cornea at a very high speed according to the preset scheme. The dwell time of each point is only a few millionths of a second, so it is called half femtosecond surgery. This ultra fast laser scanning can greatly reduce the action time on the cornea, thus reducing the pain and discomfort to patients during surgery.
Organizational recovery
Although the corneal layer cut in half femtosecond surgery is very thin, laser damage to eye tissue must exist. However, the cornea is one of the most easily recovered tissues in the human body. It usually takes only a few days to weeks to fully recover. After the operation, the doctor will give the patient corresponding medicine and nursing advice to help the cornea recover as soon as possible and reduce discomfort.
During corneal recovery, patients may feel blurred vision or slight dryness. This is a normal reaction, but during the recovery period, it is necessary to avoid external stimulation to the eyes, such as rubbing eyes or performing strenuous exercise. At the same time, patients should use antibiotic eyedrops and protective glasses as required by the doctor to protect the cornea from bacterial infection and sunlight.
Operation risks and indications
Although half femtosecond surgery has good effect and wide application in the field of vision correction, it also has certain risks and indications. First of all, the effect of surgery may vary depending on individual differences, and some patients may not be able to achieve the effect of complete correction of vision. Secondly, dry eye symptoms may occur after surgery, which requires timely treatment.
In addition, some people are not suitable for half femtosecond surgery, such as patients with eye diseases, high myopia or younger patients. In addition, pregnant women, lactating women and people with certain autoimmune diseases are also not suitable for this operation. Therefore, before deciding to accept the half femtosecond operation, careful examination and doctor's evaluation must be carried out.
summary
In a word, the half femtosecond surgery in Shanghai Hospital is a kind of vision correction surgery to improve eye problems through laser corneal correction. The operation principle is based on the laser micro cutting of the cornea to achieve the effect of changing the eye focus. After surgery, the cornea will gradually recover, and patients need to follow the doctor's guidance and nursing advice. Although the operation has certain risks and limitations, under the guidance of appropriate patients and doctors, half femtosecond surgery can help people regain clear vision.
