The requirements of full femtosecond equipment for myopia in Wuhan Union Medical College Hospital
As a well-known medical institution, Wuhan Union Medical College Hospital has introduced advanced full femtosecond equipment to provide myopia surgery for patients. However, for patients, before choosing surgery, they need to understand the requirements of full femtosecond devices for myopia. This article will discuss it from four aspects: corneal diopter, corneal thickness, pupil diameter and refractive stability.
Corneal diopter
The full femtosecond device is a laser based myopia surgery device. Its principle is to form a new corneal surface through laser cutting on the corneal surface to change the refractive power of the eye. Therefore, for myopia, the full femtosecond device needs to have a diopter adjustment capability within a certain range.
In general, the full femtosecond device is suitable for patients with myopia between -1.00 and -10.00. Patients beyond this range may need to consider other forms of surgery or treatment. Therefore, before choosing surgery, patients need to determine whether their myopia degree meets the requirements of the equipment.
In addition, for patients with high myopia, the effect of full femtosecond devices may be affected. Because the corneal diopter is too high, the depth of laser cutting will also increase accordingly, which is easy to cause surgical risks. Therefore, for patients with high myopia, doctors will make corresponding judgments and suggestions according to individual differences.
Corneal thickness
Before myopia surgery, the doctor will test the patient's corneal thickness. Corneal thickness is directly related to the depth of corneal ablation during surgery. The full femtosecond device will consume some tissue when cutting the eyeball cornea, so it needs enough corneal thickness for repair.
In general, a full femtosecond device requires a patient's corneal thickness between 500 and 600 microns. If the cornea is too thin, it may lead to too much thinning of the cornea during the operation, resulting in adverse consequences. Therefore, before choosing surgery, doctors will evaluate whether the patient is suitable for full femtosecond surgery through corneal thickness measurement.
In addition, the flatness of the corneal surface also has certain requirements for full femtosecond surgery. If there is depression or scar on the corneal surface, the effect and safety of surgery may be affected. Therefore, the doctor will check the patient's corneal surface before the operation. If there are abnormal conditions, other surgical methods may be required.
Pupillary diameter
Full femtosecond surgery requires laser cutting on the corneal surface, so there are certain requirements for the pupil diameter of patients. The larger pupil diameter may cause the laser action area to exceed the predetermined range, resulting in inaccurate or too deep cutting, thus affecting the surgical effect.
Generally speaking, full femtosecond surgery requires the pupil diameter of the patient to be less than 7 mm. If the pupil diameter is too large, the doctor will consider other surgical methods or give the patient corresponding suggestions. Therefore, before surgery, the doctor will measure and evaluate the pupil diameter of the patient.
Refractive stability
The stability of the patient's diopter is also one of the key factors in selecting full femtosecond surgery. For patients with large refractive fluctuation, the surgery may not achieve the desired effect, or even have adverse consequences such as postoperative rebound.
Generally speaking, doctors will ask patients to keep their diopter relatively stable in the past two years. If the patient's diopter has obviously fluctuated in the past period, it may be necessary to wait for a period of time to allow the diopter to stabilize before surgery.
To sum up, the full femtosecond equipment of Wuhan Union Medical College Hospital has certain requirements for myopia, including corneal diopter, corneal thickness, pupil diameter and refractive stability. Before choosing surgery, patients need to receive professional evaluation and examination from doctors to ensure that they meet the requirements of equipment and make wise decisions.
