Which complex ametropia is suitable for femtosecond surgery

Femtosecond laser refractive surgery, as an advanced refractive correction technology, is widely used in the treatment of various refractive errors. However, not all refractive errors are suitable for femtosecond surgery. This article will elaborate which kind of complex refractive error is suitable for femtosecond surgery from four aspects: abnormal corneal curvature, insufficient corneal thickness, corneal diseases and age restrictions.

Abnormal corneal curvature

Corneal curvature abnormality refers to the condition that the corneal curvature is irregular or varies greatly. Femtosecond surgery is a potential effective treatment for patients with ametropia mainly due to abnormal corneal curvature. For example, the corneal sheath on the front surface of the cornea loses the curvature of the cornea with normal distribution of layers, resulting in corneal flattening, which increases the degree of myopia. Femtosecond surgery can adjust the corneal curvature and make it return to normal through accurate laser shaping technology. In addition, corneal curvature abnormalities also include corneal astigmatism. Femtosecond surgery can change the optical characteristics through accurate corneal nicks, so as to achieve the effect of correcting astigmatism.

However, for patients with complex corneal curvature abnormalities, femtosecond surgery may have some risks. For example, problems such as insufficient corneal dilation and unsmooth corneal surface will affect the surgical effect and postoperative vision recovery of patients. Therefore, when considering femtosecond surgery, doctors need to fully evaluate the patients' corneal curvature abnormalities and select * appropriate treatment scheme.

Insufficient corneal thickness

Corneal thickness deficiency refers to the condition that the corneal thickness is less than the normal range. Femtosecond surgery requires laser ablation of tissue inside the cornea to change the corneal curvature, thus correcting refractive errors. Therefore, femtosecond surgery is not suitable for patients with insufficient corneal thickness. Because the surgery needs to remove a certain thickness, the reduction rate of too thin cornea is too high, which is prone to postoperative complications, and may even lead to serious problems such as corneal scar.

However, femtosecond surgery can solve the problem of insufficient corneal thickness by means of corneal transplantation, and then perform surgical correction. But this requires a higher level of technology and medical conditions. Not all hospitals have the same equipment and technology.

Corneal diseases

Corneal diseases refer to some corneal diseases that are not suitable for femtosecond surgery. For example, femtosecond surgery cannot be performed on corneal infection, keratitis, corneal erosion, etc. These corneal diseases need to be effectively treated before surgery, and femtosecond surgery can be performed after the normal physiological state of the cornea is restored.

In addition, some rare corneal diseases, such as corneal degenerative diseases and corneal structural abnormalities, are not suitable for femtosecond surgery. For these cases, patients need to make individualized treatment options according to specific conditions.

Age limit

Age limit refers to the applicable age range of femtosecond surgery. In general, femtosecond surgery is applicable to adult patients aged 18 years and above, because at this age, the growth and development of the eyeball are basically mature and the diopter is stable. Femtosecond surgery is not suitable for patients under 18 years of age because of incomplete corneal development and possible changes in diopter.

To sum up, femtosecond surgery is applicable to patients with abnormal corneal curvature, normal corneal thickness, no corneal diseases and over 18 years old. For other patients with complex conditions, appropriate treatment plans should be selected according to the specific situation to ensure the safety and efficacy of surgery.