What are the differences between all-femtosecond and semi-femtosecond surgeries for myopia?

Generally, the differences between all-femtosecond and half-femtosecond refractive surgeries include surgical method, applicable range, incision size, postoperative recovery, and surgical costs. Specific details are as follows:

1. Surgical Method: All-femtosecond surgery uses a femtosecond laser to complete the entire surgical process, including corneal tissue ablation and flap creation. Half-femtosecond surgery combines the use of a femtosecond laser with mechanical instruments; the femtosecond laser is used for corneal tissue ablation, while mechanical instruments are used to create the corneal flap.

2. Applicable Range: All-femtosecond surgery is typically suitable for patients with myopia up to 800-1000 degrees. Half-femtosecond surgery has a broader applicability, generally suitable for patients with myopia up to 1200 degrees. However, the exact suitability must be comprehensively evaluated based on individual ocular conditions such as corneal thickness and curvature.

3. Incision Size: The incision in all-femtosecond surgery is typically small, usually only requiring a 2-4mm micro-incision to remove the ablated corneal lens. In half-femtosecond surgery, the incision is relatively larger because a larger corneal flap is needed to cover the ablated area.

4. Postoperative Recovery: Due to the smaller incision and reduced tissue damage, all-femtosecond surgery generally allows for quicker postoperative recovery, with patients typically regaining normal visual function within a shorter time frame. Half-femtosecond surgery may involve a relatively longer recovery period due to the larger incision, and carries a somewhat increased risk of complications such as infection and dry eye. However, these risks can be minimized with proper surgical technique and postoperative care.

5. Surgical Cost: All-femtosecond surgery typically costs more due to its advanced technology and expensive equipment. Half-femtosecond surgery is relatively more affordable, although the exact cost should be evaluated comprehensively based on factors such as the hospital and surgeon involved.

When choosing a surgical method, patients should make a comprehensive decision based on their own ocular conditions, financial capacity, and the recommendations of their ophthalmologist.