The thickness of corneal chips in myopia surgery, how much corneal thickness should be cut in myopia

After laser surgery, the corneal thickness should be at least 400. This means that the difference between the thickness of your cornea minus the required chips is greater than 400A high prescription does not mean that laser surgery cannot be done, and it should also be determined by the thickness of your cornea.

By the way, consider the situation under your eyes!

The higher the degree, the more corneal thickness is needed, so some high myopia can not be done, the choice of femtosecond laser can retain more effective corneal thickness, generally every 100 degrees need 11-17 microns of cornea, you still go to the hospital to check your cornea.

Age 18-50 years old, the degree of 100-1200 is within the scope of myopia surgery, but you must first go to the hospital for a comprehensive preoperative examination, look at the comprehensive situation of your eyes, generally the minimum corneal thickness is above 350 is safe, but the specific need for the doctor to know, the higher the degree for the cornea, the higher the thickness of the cornea.

You can come to our hospital to see, our hospital has now introduced femtosecond, more cornea saving, may be suitable for you, Preh Ophthalmology welcomes you.

Hello, myopia needs to be controlled, don't be really myopia, otherwise you will regret it for a lifetime!

I have experience with myopia**, so I'll give you some advice:

But if you are short-sighted, don't wear glasses if you can, otherwise you won't be able to put them on and take them off, which is the feeling of many people.

Also, pay attention to eye hygiene, do not hold the pen incorrectly, and do not bow your back and back.

Eat some lamb liver. Eat some cod liver oil.

If**, I have to use the pearl of my eyes, **go find it, maybe there is.

This traditional Chinese medicine is more effective than cod liver oil, it can be said to be miraculous, and it does not harm the body, it is recommended that you try it, and it is not expensive. However, you can't eat seafood with this medicine.

There is also a daily blink of the eyeballs, which has a lot of benefits for the eyes.

Pay attention to health care and don't overuse your eyes.

Usually look into the distance.

You can wear glasses, read books, or look at the computer when you look at the blackboard, but the main thing is that the distance is far!

Read at a distance from the computer, as far away as possible.

The light must not be too strong or too dark.

This will make your eyes better.

I am a doctor in a Chinese medicine hall, this is a clinical experience, do you feel satisfied?

It is operated on the cornea, and the operation will preserve the safety of the cornea, and I heard that femtosecond seems to save the cornea a little, so you can go to the hospital and consult the teacher.

Generally, the cornea has more than 250um left, in fact, considering an error of the laser. For example, if you expect to cut 100, he may cut 110, so that you can't calculate according to 250 when calculating, and calculate the error of the laser. At present, according to our experience, the bottom limit of 250um is still safe.

Laser myopia eye surgery is an elective surgery that requires myopia patients to meet various requirements, the most important of which is corneal thickness, which is the key to determining whether surgery can be performed and the outcome of the surgery.

Laser myopia surgery is to correct myopia by thinning the cornea and changing the curvature of the cornea, but no matter how thinning, the cornea always has a safety bottom line. Once this safe thickness is breached, complications can occur.

The current general standard is that corneal thickness less than 450 microns is not suitable for laser myopia eye surgery. There are also some patients with high myopia, although the cornea is thick enough, but in the process of laser myopia eye surgery, for every 100 degrees of myopia corrected, about 12 microns of cornea need to be cut. In addition, it is important to know that the more corneal thickness is preserved after laser myopia eye surgery, the safer the surgery will be.

Generally speaking, the corneal thickness of normal people is 500um-600um, myopia surgery will first cut a corneal flap with a lamellar knife, the thickness of this corneal flap is about 160um, and then every 100 degrees of myopia needs to be vaporized by laser for about 12um, and the thickness of the corneal basal layer (excluding the corneal flap) after treatment I treatment should be at least 250um, that is to say, the remaining cornea after myopia surgery must be retained to a safe thickness of 410um (corneal flap + corneal basal layer).

If the remaining corneal thickness is less than 410um, it is difficult to resist the imbalance between intraocular pressure (IOP) and atmospheric pressure, and there is a chance that keratoconus may occur, resulting in severe vision loss, and corneal transplantation may be required in the long run.

Therefore, myopia surgery also requires the thickness of the cornea: the normal corneal thickness is about 550 microns, and if the corneal thickness is too thin, it cannot be performed.

Myopia surgery has been developed for 20 years, and the technology is very mature, but because it is a surgery, it is risky, so it is still necessary to be cautious. Surgery is not recommended by doctors.

Now myopia is getting younger and younger, in fact, as long as the myopia in the vision development period is treated with drugs in time, myopia can be recovered. It is generally recommended to take Leyan Vision Nutrients, take it with warm water, and insist on taking it for a period of time, the myopia degree will gradually decrease, and the vision will slowly recover.

For patients with thin corneas, laser superficial surgery or intraocular lens implantation** myopia. If the patient's financial conditions allow, it is recommended to undergo intraocular lens implantation with higher comfort, safety and reversibility. For laser lamellar surgery, part of the corneal tissue needs to be removed during the operation, and the remaining corneal thickness of the patient is required to be more than 250mm, or even higher for some special patients, so this method is generally not used for patients with thin corneal thickness.

There are special discounts for college students, military members, civil servants, etc.

Hello, under normal circumstances, if you want to do surgery **myopia, the thickness of the cornea should be at least greater than 460 microns, so that it is a safe corneal thickness.

Generally speaking, the corneal thickness of normal people is 500-600um, and when doing laser surgery, a special corneal plate knife will be used to make a corneal flap, which is equivalent to lifting the cornea from the middle, and then playing a laser on the corneal stromal layer under the valve, every 100 degrees of myopia needs to be vaporized with a laser for about 12um, and the thickness of the corneal basal layer (excluding the corneal flap) after surgery should be at least 250um. In other words, the remaining cornea of each patient must be preserved to a safe thickness of 410um (corneal flap + corneal basal layer) after laser surgery.

Surgical Requirements for Myopia Surgery:

1. Must be over 18 years old.

Myopia under the age of 18 is still in the stage of vision development. Myopia can be treated with medication**. It is generally recommended to take two packs of Joy Vision Nutrients a day, and insist on taking it for a period of time, the degree of myopia will be reduced, the vision will be improved, and there is no need for adult surgery.

2. The degree of myopia is between 100-1500 degrees, the degree of astigmatism is within 400 degrees, and the vision is stable for more than two years.

3. There are no other ophthalmic diseases, which do not affect the postoperative recovery.

4. The thickness of the cornea is thick enough. Generally, it is required that the operation should not be less than 410 m after the operation, and only after the preoperative examination can the operation be carried out.

The corneal thickness of normal people is about 550 m, and the remaining corneal thickness should not be less than 400 m after excimer keratomy, if myopia surgery is required, Guangzhou Yinghua Ophthalmology is recommended. According to the analysis of different corneal thickness, the details are as follows:

1. Less than 400 m: theoretically there is a certain risk, with intraocular pressure fluctuations and other unfavorable factors, it may have an adverse effect on the corneal morphology and other parts of the eye;

500 m: The cornea thickness is thin, and excimer laser surgery is generally required, with a cautious attitude;

3. When it is greater than 550 m: if the patient has moderate or low myopia, it is relatively safe to undergo excimer corneal surgery. If you want to correct myopia for patients with thin corneas and high myopia, you can choose ICL, that is, phakic intraocular lens implantation for myopia correction.

There is no obvious requirement for corneal thickness when performing this type of surgery, but there are clear requirements for anterior chamber depth and posterior chamber depth, and phakic intraocular lens implantation is not suitable if the anterior chamber depth is too shallow. [Click to test whether I am suitable for myopia surgery].

If you want to know more about myopia surgery, we recommend consulting Guangzhou Yinghua Ophthalmology. Yinghua Ophthalmology is a national chain brand ophthalmology mainly engaged in laser correction of myopia, the hospital mainly carries out international advanced solutions such as full femtosecond, personalized half femtosecond, personalized laser surgery, etc., bringing together many well-known domestic myopia correction experts, and investing in the introduction of international advanced German femtosecond laser surgery equipment, etc., to provide high-quality, multi-level modern medical services for every myopia patient. <>

Director Gao Chengbin, an expert from Fuzhou Eye Hospital, said: Generally speaking, the corneal thickness of normal people is 500um-600um, and when laser surgery is carried out, a corneal flap will be cut with a lamellar knife, and the thickness of this corneal flap is about 160um, and then every 100 degrees of myopia needs to be vaporized by laser for about 12um, and the thickness of the corneal basal layer (excluding corneal flap) after ** should be retained at least 250um. In other words, the remaining cornea of each patient must be preserved to a safe thickness of 410um (corneal flap + corneal basal layer) after laser surgery.

To be honest, I'm against this surgery. To put it simply, this surgery uses a laser to thin the cornea, which really solves the problem of myopia. However, some questions, such as whether the intraocular pressure of the plane has an effect, and in addition, what the long-term effect is, need to be further observed, and I hope you will think twice.

The surgical principle of excimer laser myopia correction** is to vaporize the cornea to the required thickness with laser, so that the image seen by the eye can be correctly projected on the retina to achieve the purpose of correcting vision. Therefore, the corneal thickness of each myopic patient is the most important determining factor before laser surgery, and it must be within a sufficient safe thickness range before the surgery is performed. It is even more important for patients with high myopia (above 800 degrees), because patients with high myopia need more corneal thickness for laser polishing during surgery, so the requirements for corneal thickness are higher.

Through corneal thickness examination, the surgeon can accurately grasp the average thickness of the cornea, the thickest point and the thinnest point, so that he can make a judgment and decide whether to accept excimer laser myopia correction**. 000 The importance of corneal thickness examination is mainly reflected in the following points: avoid keratoconus and other conditions.

After myopia surgery, the remaining cornea of each myopic friend must retain a safe thickness (corneal flap + corneal basal layer), because if the remaining corneal thickness is less than this safe thickness, it is difficult to resist the imbalance between intraocular pressure (IOP) and atmospheric pressure, and there may be a chance of keratoconus, resulting in serious loss of vision. Determine the appropriate range of optical areas of the eye**. Since the larger the laser range** in the optical area of the eyeball, the thicker the thickness of the laser needs to be polished.

Therefore, sometimes doctors encounter patients with insufficient corneal thickness, and may adopt the practice of shrinking the laser ** area in order to achieve the requirement of safe thickness after surgery. However, the reduction of the laser ** area will easily cause night glare and poor visual quality after vignetting, so the balance between various values has become the key to the success of the operation.

It is recommended to go to the hospital for examination before surgery!

The cornea of a normal person is 550 microns, and the laser needs to consume 12 microns for every 100 degrees of correction. However, LASIK surgery requires a corneal flap, which is to cut the cornea with a knife and thin a layer, but leave a little bit to keep it from falling off, and then inject a laser inside. The thickness of this corneal flap varies according to the different types of surgery (90 to 160 microns), and after recovery, the outermost upper epidermis of this flap will heal (about 60 microns), and most of the inner flap will not heal, which means that this flap cannot resist the pressure of the eyeball, and it is likely to tear the wound open again after trauma.

I don't think any type of LASIK (excluding Epi-LASIK) surgery is suitable for people who are in the military, because you can touch your eyes at any time.

Getting back to the point, based on the data above, to do the best lasik you will lose: 12 * (6 + 2) + 90 = 186 microns.

If your original corneal thickness is 550, the remaining effective cornea is 550-186 = 364 microns.

To do the general lasik (130 microns), the loss is 12 * (6 + 2) + 130 = 226, and the remainder: 550-226 = 324 microns. The minimum standard for the thickness of the corneal stromal bed for this procedure is 250 microns (note that it is the "minimum", which is actually very unsafe, and it is best to be above 400 for insurance).

So according to the minimum standards of the hospital, you should be able to do a general LASIK (if you have a normal corneal thickness), but considering that you are going to join the army, it is not recommended that you have these surgeries that will leave a corneal flap wound. Anything on the market, such as top-lasik and super-lasik, will have residual corneal flaps (except epi-lasik). If you really want to do it, it is recommended that you do EK surgery, i.e. LASEK, Epi-LASIK, these two surgeries cut the cornea at the position of the upper epidermis of the cornea, and the upper epidermis will heal with the lower layer after the operation, but the healing process is quite uncomfortable, it is simply impossible to open the eyes, the healing process takes 1 to 3 months, and the most uncomfortable of them is the first week.

But after it heals completely, it will not leave a wound, and the cornea will be stronger than Lasik (but it is still more fragile than before surgery), so to speak, according to your degree, the cornea resistance to external force will decrease by 1 3 to 1 2, but because the outer corneal flap is easy to shift or even fall off, the resistance to external force will decrease more. However, these two surgeries with EK only lose 1 5 of the ability to resist external forces, and there is no need to worry about the displacement of the corneal flap. However, it takes a month or two to achieve ideal vision after surgery.

When will you have a medical check-up? I'm afraid I can't do it if I'm in a hurry.

Think for yourself.