The difference between semi-femtosecond and full femtosecond is that many people are nearsighted and can be operated. More and more people choose to take off their glasses through myopia surgery to facilitate their lives. Let's first look at the difference between semi-femtosecond and full femtosecond and related information.
The difference between semi-femtosecond and full femtosecond is 1. Semi-femtosecond and full femtosecond are different methods of corneal laser surgery, and the operation principle is different, so is the laser. The specific differences are as follows:
1, semi-femtosecond: refers to femtosecond laser combined with excimer laser for myopia correction surgery. The specific operation method is to make a corneal flap on the cornea with femtosecond laser, and after lifting the corneal flap, remove the myopia degree with excimer laser;
2. Full Femtosecond: It is a kind of surgery that uses femtosecond laser to correct myopia. The surgical method is to make a small incision on the cornea, and then use femtosecond laser to cut out the lens on the cornea and take it out manually. This lens is the degree of myopia.
Therefore, whether to choose semi-femtosecond surgery or full femtosecond surgery requires detailed eye examination, because the indications of these two surgical methods are different. Some people are suitable for full femtosecond surgery, while others are suitable for semi-femtosecond surgery. Therefore, it is recommended to follow the doctor's advice and choose a specific and appropriate surgical method, because the appropriate surgical method is an important guarantee for the safety of the operation.
Semi-Femtosecond and Full Femtosecond: Working Principle
Semi-femtosecond: Using femtosecond laser to make an open corneal flap, and then using excimer laser to cut and ablate the cornea to change the curvature of the cornea, so as to correct myopia.
Full femtosecond: A unique corneal stroma lens extraction operation, which uses femtosecond laser to make a lens on the corneal stroma layer, and then uses femtosecond laser to make a small incision on the corneal edge, and then removes the lens through this incision. The operation process is completed in one step, and excimer laser is no longer needed.
Half Femtosecond and Full Femtosecond: Surgical Equipment
Semi-femtosecond: completed on two machines, one is femtosecond laser equipment and the other is excimer laser equipment. Different devices have different functions.
Full Femtosecond: Only one device is needed to complete all the surgical procedures, and no other instruments and equipment are needed.
Half Femtosecond and Full Femtosecond: Surgical Incision
Semi-femtosecond: Because it is necessary to make a corneal flap and open the corneal flap to ablate the corneal stroma layer, the incision made by femtosecond laser is about 20 mm
Full Femtosecond: Only 2-4mm incision is needed to ensure that the doctor can take out the microlens.
Semi-Femtosecond and Full Femtosecond: Surgical Safety
Laser surgery has been carried out for more than 20 years, and it has been clinically proved to be a safe refractive surgery. In addition, more than 20 tests will be conducted before the operation to check the risks. If the eye is at risk or the postoperative prediction effect is not satisfactory, the doctor will not operate on the patient, so the safety of the two surgical methods is guaranteed.
Refractive surgery has gone from the first generation excimer era to the semi-femtosecond (all-laser) era, and now it has entered the third generation all-femtosecond era. Refractive surgery is developing in a more accurate, comfortable, safe and minimally invasive direction. Simply put, full femtosecond is an upgraded and optimized version based on semi-femtosecond laser surgery.
Feng introduced that some hospitals are under the banner of "full personality femtosecond" and "full laser femtosecond", which is actually semi-femtosecond. Everyone should pay attention to the distinction. But each operation method has its own reason, and what kind of operation method is suitable for myopic friends.
It is still necessary for professional doctors to analyze and judge according to the examination results of nearsighted friends. There are no two identical eyes in the world. Because of different degrees, corneal thickness and anterior chamber depth, each myopia patient should have different surgical plans, which requires personalized customized surgical plans.
The difference between semi-femtosecond and full femtosecond 2 surgical equipment: Full femtosecond only needs one equipment.
Semi-femtosecond is completed on two machines, one is femtosecond laser equipment and the other is excimer laser equipment. Different devices have different functions.
All surgical procedures can be completed in femtoseconds with only one device, and no other instruments and equipment are needed.
Surgical incision: the full femtosecond incision is smaller.
Semi-femtosecond needs to make a 20mm incision on the cornea, close to a circle, form a corneal flap, lift the corneal flap, then use excimer laser to cut and ablate the cornea, and then cover the corneal flap.
All femtosecond surgery only needs to cut a small incision of 2mm at the edge of cornea, then cut a lens in the middle of cornea with laser, and then take this lens out of the incision.
Surgical effect: basically the same.
The effect of these two operations is the same. Basically, the vision will reach about 1.0 on the second day after operation.
Operation time: about the same
Half-femtosecond and full-femtosecond operation time is very short, the whole operation is less than 10 minute, and the patient's cooperation time is almost half a minute. If operated by a skilled doctor, the operation time of full femtosecond will be slightly shorter than that of half femtosecond.
Healing time: Full femtosecond is faster.
Because the cornea has no blood vessels, it will heal slowly after incision, so the semi-femtosecond healing is not as fast as the full femtosecond healing.
Postoperative care: Pay more attention to protecting eyes within half femtosecond.
Because the semi-femtosecond incision is large, more attention should be paid to protecting the eyes and cornea with large incision after operation. You don't have to worry about this problem after full femtosecond surgery.
So, how to choose "semi-femtosecond" and "full femtosecond"?
We insist that every eye is unique. No matter what kind of surgery, after a set of detailed preoperative examination, let the doctor judge and choose the most suitable surgery for your eyes. Our goal is not only to help you take off your glasses, but also to create a clear "vision" with personalized customization, so that you can have high-quality visual quality and better quality of life.
Relax and smile
Surgical features:
All-femtosecond laser myopia surgery does not need to make corneal flap, which can greatly maintain the complete physical shape of cornea. It is a truly safe correction method without knife and valve, which greatly reduces the probability of dry eye, recovers faster after operation and has stable effect. It is the mainstream myopia surgery at present.
Surgery:
1. Mirror making: Femtosecond laser scans the deep and shallow layers of corneal stroma respectively, and then makes convex lens after scanning;
2. Incision: using femtosecond laser to make a micro-incision with only 2mm;
3. taking out the lens: taking out the lens through a micro-incision to complete the operation;
Suitable for people:
18 to 50 years old, myopia ≤ 1000 degrees, astigmatism ≤500 degrees, stable myopia for more than two years, no progressive eye disease, able to pass the preoperative examination of full femtosecond myopia surgery, and stricter eye conditions than femtosecond laser.
Femtosecond laser
Surgical features: corneal flap was made with femtosecond laser, and then corneal ablation was completed with excimer laser. The production level of corneal flap is obviously better than that of lamellar knife, which has no damage to tissue, more accurate flap reduction, conforms to the natural state of human eyes and wider correction range.
Suitable for people:
18 to 50 years old, myopic degree ≤ 1000 degrees, astigmatism ≤500 degrees, stable myopia degree for more than two years, no progressive eye disease, and passed the preoperative examination, which met the surgical indications.
Surgery:
1, corneal flap making: using femtosecond laser to make corneal flap and turn it over, the whole process only takes 16 seconds;
2. Engraving: according to the pre-input data, excimer laser engraving is carried out on the corneal stroma layer to make the degree;
3. Reset: After laser engraving, reset the previously flipped corneal flap to its original position, and the operation is completed.
ICL lens implantation
Surgical features:
ICL intraocular lens implantation is a more suitable surgical method for patients with high myopia. However, ICL has no requirement for corneal thickness, and the range of degrees that can be corrected is wider than that of laser myopia surgery. The implanted ICL lens can also be removed or replaced, and the visual effect is better than that of ordinary frame glasses.
Suitable for people:
Myopia of 50- 1800 degrees, astigmatism of 50-600 degrees, and thin cornea can all be considered.
The difference between semi-femtosecond and full femtosecond 3 In recent years, people have been asking me what is semi-femtosecond and what is full femtosecond at most?
Let's start with full femtosecond. Full femtosecond is a commercial logic term, which is medically called "femtosecond laser-assisted corneal lens extraction (smile)".
Through two femtosecond lasers, the stromal layer (corneal tissue) is cut in the cornea, and an incision is made on the corneal surface to take out the lens in the cornea, thus achieving the purpose of correcting myopia.
At present, this technology is controlled by Zeiss's surgery, and only this company in the world is producing corresponding equipment, so Zeiss calls this kind of surgery full femtosecond, while other companies call it semi-femtosecond.
What about half femtosecond? Similarly, no company will define its products as semi-femtosecond, which is imposed by Zeiss. It is certainly wrong to feel that half femtosecond is worse than full femtosecond.
From the schematic diagram, we can know that these are actually two different surgical methods.
Therefore, most manufacturers will call their own surgical methods femtosecond full laser. Professionally, it is actually called "femtosecond laser-assisted LASIK".
But if they are all called full femtosecond or semi-femtosecond, it seems that LASIK is worse than smile.
These surgical methods have their own advantages and disadvantages. At present, LASIK has more advantages than smiling.
This may be different from the inherent impression in many people's minds, so why do doctors recommend full femtosecond when they go to the hospital, as long as they can do it? It is said that full femtosecond is the safest minimally invasive surgery at present.
In this case, it is said that a full femtosecond machine is tens of millions. The hospital bought it, but who will pay if it is not promoted vigorously?
Let's talk about the advantages first. Smile surgery is the latest corneal refractive surgery, yes, but isn't it the safest? This is definitely a question mark. Lasik surgery and icl surgery are said to be the safest. In fact, if refractive surgery is unsafe, it is impossible to go on the market. It is meaningless to emphasize safety. It is true that the incision is the smallest, but this incision refers to the incision of the outermost corneal epithelial layer, which is the same size as the incision of the stromal layer (because the visual field needs to be corrected). Because the incision of the epithelial layer is small, it is more friendly to patients with dry eye.
Therefore, the advantages of smiling can be summarized as follows: the incision of corneal epithelium is small, but the most important thing is this. However, corneal epithelium can heal perfectly without leaving any scars. If dry eye is serious, it is not recommended to do any unnecessary eye surgery, because the stimulation of the cornea may aggravate the symptoms of dry eye, and there is no need to take this risk for this icing on the cake operation.
What are the advantages of lasik surgery? Since the birth of this surgical method in the 1980s, through the development of various technologies, although the principle remains the same, the accuracy and safety have undergone tremendous changes. From the earliest common laminating knife to ultra-thin laminating knife, and finally to femtosecond bladeless. The advantage is that the accuracy is very high, and various types of personalized guidance and optimization can be done. At present, the most personalized is Alcon's carving femtosecond, which can realize point-to-point cutting.
Perhaps here, many people don't understand the influence and difference between high accuracy and personalization on our surgery. Everyone's cornea has a different shape.
We can see there are different colors, and different colors represent different curvatures. Finally, we can enlarge the effect that we can directly understand.
The redder the color, the greater the corneal curvature, which can be understood as the higher.
Different corneas have different shapes, but they may all be the same myopia. If we operate directly without considering the corneal morphology, the postoperative corneal morphology will be more irregular and have a greater impact on our visual quality.
The disadvantage of LASIK is that the incision of corneal epithelial layer is large, because corneal flap needs to be made to protect the cornea. However, as mentioned above, the corneal epithelial layer can heal perfectly, so this incision is relatively large, which has no influence on us, but the visual quality will always affect our daily life, the most obvious ones are decreased vision at night, glare and halo.
At present, Zeiss is also developing a full femtosecond machine, using eye tracking technology. It is believed that in the near future, personalized surgery can also be performed on a full femtosecond machine.
Therefore, at present, choosing full femtosecond surgery for a small incision in corneal epithelium is a typical case of picking up sesame seeds and losing watermelon.
At present, the biggest difference between the two operations is whether personalized treatment can be carried out.
When choosing the operation method, the mature personalized operation scheme should be given priority, rather than the new method of mice.
Of course, due to the limited space, the advantages and disadvantages of the two operations have not been fully clarified. Interested friends can pay attention and update the corresponding series later.