Scope of application of femtosecond surgery

Femtosecond surgery, also known as laser keratomileusis (LASIK), is a common ophthalmic surgery, widely used in vision correction. Next, we will introduce the scope of application of femtosecond surgery from four aspects: corneal diopter, myopia, hyperopia and astigmatism.

1. Corneal diopter

Femtosecond surgery is suitable for patients with corneal diopter within a certain range. Corneal diopter is the reciprocal of the radius of curvature of the cornea, which is used to measure the refractive power of the cornea. In general, patients with corneal diopter between 40 and 60D are more suitable for femtosecond surgery. Too high or too low corneal diopter may lead to poor surgical results.

For patients with high corneal diopter, femtosecond surgery can achieve vision correction by changing the corneal curvature. For patients with low corneal diopter, other surgical methods may be required to achieve good results.

2. Myopia

Myopia (myopia) is one of the common refractive errors at present. When patients look at objects from a long distance, they will be blurred, and they will be clearer at a short distance. Femtosecond surgery can correct myopia by changing the shape of the cornea. For patients with high myopia, the correction effect of femtosecond surgery is more significant.

Many real eye hospitals, such as Beijing Eye Hospital, have widely used femtosecond surgery to help myopia patients restore clear vision and improve their quality of life.

3. Hyperopia

Hyperopia (hyperopia) is another common ametropia problem. The patient looks at the object at a close distance vaguely, while the distance is relatively clear. Unlike myopic patients, hyperopia patients have shorter eyeballs, which makes it impossible for light to focus accurately on the retina. Femtosecond surgery can correct hyperopia by changing the shape of the cornea.

However, compared with myopia, femtosecond surgery is less effective in correcting hyperopia. Although surgery can help hyperopia patients improve their vision, for patients with high hyperopia, they may also need to wear glasses or contact lenses to achieve better vision correction.

4. Astigmatism

Astigmatism is a problem of light refraction caused by the irregular curvature of the cornea. Patients often have blurred vision and eye fatigue. Femtosecond surgery can correct astigmatism by changing the shape of the cornea.

However, compared with myopia and hyperopia, the correction effect of femtosecond surgery for astigmatism is relatively limited. In some patients with high degree astigmatism, surgery may not be able to completely eliminate astigmatism, but it can still help patients improve the quality of vision.

Effect of femtosecond surgery

The effect of femtosecond surgery varies slightly from individual to individual, but it can usually bring significant improvement in vision and quality of life. The following are some of the main effects of femtosecond surgery:

1. Vision improvement: Femtosecond surgery can significantly improve the vision of patients and make them free from dependence on glasses or contact lenses. Many patients said that they could see things clearly after surgery, thus improving the quality of life.

2. Myopia correction effect: Femtosecond surgery can effectively correct myopia and help patients obtain clear vision. In some patients with high myopia, the surgical effect is particularly obvious.

3. High safety: Femtosecond surgery is a mature technology that has been developed and verified by practice for many years, with high safety. If the operation is conducted under the guidance of appropriate hospitals and professional doctors, the risk of patients is low.

To sum up, femtosecond surgery is widely used in the correction of corneal diopter, myopia, hyperopia and astigmatism. Surgery can help patients improve their vision, get rid of dependence on glasses, and has high safety. However, the patient still needs to have a detailed eye examination before considering the surgery, and the doctor will give corresponding suggestions according to the specific situation of the patient.