What is the purpose of preoperative examination of femtosecond laser surgery?

Abstract: many people know that a series of detailed preoperative examinations are required before femtosecond laser surgery, which takes about 1.5-2 hours, while the real operation takes only a few minutes. Why? What is the purpose of preoperative examination of femtosecond laser surgery? Now let’s understand.

femtosecond laser surgery is a leader in laser myopia surgery. It does not need to use a corneal scalpel, and the whole process laser valve making has won the favor of many myopia patients.

femtosecond laser surgery is a high-tech medical technology, so the requirements for patients are relatively strict, and there are many contraindications. Whether myopic patients are suitable for femtosecond laser surgery needs to be determined through examination. A detailed, comprehensive and preoperative examination of excimer laser surgery to ensure the safety of patients to the greatest extent is one of the key factors for the success of surgery. Hospitals should strictly screen patients and try not to do it if it is not suitable for surgery. However, there are still some hospitals that completely put economic interests first, resulting in serious sequelae after some patients finish the operation.

femtosecond laser surgery main examination items:

1. Visual acuity examination: including naked visual acuity and the best corrected visual acuity with glasses.

2. Refractive examination: it includes three steps: computer optometry, mydriatic optometry and retest. Whether the diopter is correct or not directly affects the surgical effect.

3. Examination of corneal curvature: exclude the possibility of keratoconus and flat cornea.

4. Corneal topographic map examination: the main purpose is to understand the regularity and symmetry of the whole corneal surface and exclude keratoconus and other abnormalities.

5. Corneal thickness measurement: ultrasonic corneal thickness examination is absolutely necessary for any corneal lamellar plastic surgery. If after calculation, it is impossible to ensure that the postoperative stromal bed thickness of the patient is greater than 250 microns or the overall corneal thickness is greater than 360 microns, the operation should be abandoned.

6. Fundus examination: the macular area and peripheral area of the fundus retina should be examined in detail. When retinal holes and lattice changes are found, the patient should be informed that there is a high incidence of retinal detachment, and preventive treatment should be given before refractive surgery.

7. Intraocular pressure measurement: find out whether the patient has glaucoma, high intraocular pressure and other eye diseases that affect whether he can accept laser myopia surgery.

8. Corneal slit lamp examination: this part includes eye tissue examination, tear layer assessment and intraocular pressure measurement. If the test results are extremely abnormal, the possibility of collagen disease should be suspected. At this time, it is best to draw blood for confirmation. If the patient is diagnosed with primary dry eye, it is best to inform the possibility of prolonged use of artificial tears before operation.

it can be seen that preoperative examination is very important. Each item is to eliminate potential safety hazards for patients. Therefore, we should not feel troublesome and should take it seriously.