How big is the laser? What are the pros and cons of doing lasers

It can instantly break you down into particles that are invisible to the naked eye, and you're gone, and the police don't care.

Advantages of laser myopia: The effect is ideal for patients with low and medium refractive errors, the myopia rate is low, and you can temporarily do not need to wear glasses for a period of time through surgery. The current problems and drawbacks of laser ** myopia are also obvious:

Because this surgery has not been available for a long time, ophthalmologists have not yet been able to count and determine its long-term effect; Some patients order eye drops for a long time after surgery, otherwise their eyes will be dry and uncomfortable, and some even require eye drops for a lifetime. In addition, the following complications are prone to occur during and after the operation: 1. The corneal flap is off-center, the corneal flap is misaligned, the corneal flap is wrinkled, and the corneal interlaminar debris or blood remains; 2. The laser cutting is off-center, and the corneal knife cuts through the cornea; 3. Postoperative lifelong glare and glare:

Myopia is more common in height, and there is a halo when looking at things; 4. Under-correction or over-correction: In this case, another operation will be required, and the effect after the reoperation is not very ideal; 5. Visual acuity**: especially for patients with high myopia, vision begins to decline a few years after surgery; 6. Best-corrected visual acuity loss

Unable to achieve the same vision as possible with glasses after surgery; 7. Dyslexia, dry eye, decreased corneal sensitivity, pain; 8. Irregular astigmatism: almost all patients have varying degrees of irregular astigmatism after surgery. 9. Corneal infection, diffuse interlamellar keratitis, formation of corneal insula:

10. Degeneration or scarring of the corneal periphery, corneal center pigmentation. For all these reasons, most doctors are reluctant to perform laser surgery on people with myopia. Regardless of the percentage of the incidence of the above sequelae, any one of the many complications that falls on a patient who undergoes this surgery will be a lifelong regret and unhappiness.

Because we only have one pair of eyes, light is priceless. What's more dangerous is that according to strict medical regulations, a corneal knife can only be used in one eye, however, nowadays, in some hospitals or myopia** centers, in order to obtain high profits, a corneal knife is reused, just like it is often reported that dialysis tubing in hospitals are reused. Therefore, before doing this surgery, do not listen to the one-sided words of one party alone, and be sure to think carefully and weigh it repeatedly.

On the other hand, this surgery is expensive and costs thousands of dollars, so it is hoped that the majority of patients with refractive error should carefully weigh the pros and cons and think twice.

Pros and cons of myopia surgery. I analyzed it this way, first of all, we said that the advantage is that you don't have to wear glasses, so that life becomes convenient, and you don't need to wear glasses to be relatively beautiful, beautiful.

The second is the disadvantages, first of all, complications may occur during the operation, and the complications will have a certain impact on vision. Another disadvantage is that it costs a certain amount of money.

The benefits of myopia surgery are: it frees people who are nearsighted from the shackles of glasses and corrects their vision.

The disadvantages of myopia surgery are:

1. The corneal flap is off-center, the corneal flap is not in good alignment, the corneal flap is folded, and the corneal interlaminar debris or blood remains.

2. The laser cutting is off-center, and the corneal knife cuts through the cornea;

3. Postoperative lifelong glare and dazzling: myopia is more common in height, and there is halo when looking at things.

4. Under-correction or over-correction: This situation will require re-operation, and it is not ideal after re-operation.

5. Vision**: Especially for people with high myopia, vision begins to decline a few years after surgery.

6. Best-corrected visual acuity decline: After surgery, it is not possible to achieve the visual acuity that can be achieved with glasses.

7. Dyslexia, dry eye, decreased corneal sensitivity, pain;

8. Irregular astigmatism: Almost all people who have myopia surgery have varying degrees of irregular astigmatism after surgery.

9. Corneal infection, diffuse interlamellar keratitis, formation of corneal insula:

10. Degeneration or scarring of the corneal periphery, corneal center pigmentation.

Myopia surgery has been developed for more than 20 years, and the technology is very mature, but surgery is risky, and not everyone with myopia can undergo surgery. Myopia surgery must be over 18 years old, the myopia degree is between 100-1500 degrees, there are no other eye diseases, and the myopia surgery can be performed only after a detailed preoperative examination that meets the requirements.

Nowadays, the occurrence of myopia is getting younger and younger, in fact, as long as parents pay enough attention to it, in the early stage of children's myopia, they will be actively treated, and children's myopia can be recovered. Generally, children under the age of 18 are myopic, as long as they take Leyan Vision Nutrients in time, twice a day, one sachet each time, take warm water, and insist on taking it for a period of time, the child's myopia will gradually decrease, and it will avoid the trouble of whether surgery is needed in adulthood.

The damage of laser to the human body is mainly the eyes, followed by **.

1) Damage to the eyes and vision Laser can burn biological tissues, especially the retina is the most common. Because the laser beam can be focused on the retina by the eye's own refractive system, it can cause burns due to a high concentration of light energy. Laser radiation in the infrared or microwave region can be absorbed by the iris or crystals, causing thermal damage, leading to iritis and cataracts.

The damage of laser to the eye is related to factors such as tone wavelength, pulse width, gap time, beam energy, angle of incidence, and irradiated tissue characteristics.

After the glasses are irradiated with laser, they may suddenly have a sense of glare, blurred vision or a fixed black shadow in front of the eyes, and even loss of vision. The damage of laser radiation to the retina is the most important and easy to be ignored. Long-term regular exposure to small doses and diffuse reflection laser irradiation, staff generally do not find themselves with visual impairment, sometimes have general neurasthenia, visual fatigue after work, eye pain, etc., no specific symptoms.

Except for the permanent loss of vision in a few individuals, most of the accidental injuries to the eyes by laser have varying degrees of recovery after **.

2) Injury to ** The damage process of laser to ** is manifested as mild erythema, burning until tissue charring necrosis, in addition to damage pigment cells, causing capillary plugging, sometimes blood vessel rupture and hemorrhage. **Damage is usually reversible and reversible.

The most important way to prevent laser hazards is safety education, strictly prohibiting naked-eye laser beams, and paying attention to operating procedures; Determine the operation area and danger zone and have eye-catching warning signs, irrelevant personnel are not allowed to enter at will, wear appropriate protective glasses, protective gloves, and regularly check the body, especially the eyes.

The operation is to maintain the structure made of light-absorbing materials, and the color should be dark. Equipment or utensils that can reflect or refract light beams shall not be installed indoors. The light shield of the laser beam is made of refractory material, the opening of which should be connected to the truncator of the beam amplification system.

It doesn't matter if you hurt **, it heals much slower than ordinary wounds.

Dude, how much power is your laser? What is the diameter of the spot? Is it a direct shot? Hurt in **? How long does it take to receive the radiation?

How do you cherish life, why don't you go to the doctor and listen to what the doctor has to say.

Xiao Wei's analysis of China's laser, which is one of the best in the world at this stage The analysis believes that China has focused on solving a number of major problems that need to be solved urgently in the application of military laser engineering, and can reach a level and degree that other countries cannot achieve. Lasers are divided into two categories: one is used as a tactic, which is used to directly destroy personnel, tanks, aircraft, tactical missiles, etc., such as laser cannons in conventional warfare; One is used as a strategic **, which is used to deal with ballistic missiles, space**, etc.

Laser** is currently airborne, shipborne, and spaceborne. China's newly developed portable laser dazzle gun can instantly stun people and temporarily lose their blindness, thus losing their resistance, and can be applied to anti-terrorism and riot control.

It can be seen that China is not lagging behind in the development and application of laser components, and the technology is not bad, and it has considerable potential. In the 1960s, a strong laser has been developed, and China's level of laser component and basic technology research is slightly inferior to that of the United States, and it was among the best in the era.

China's industrial laser technology is still only in the application stage, and the following marking machines are still relatively mature. However, China does not have its own core technology for high-power (3kw-20kw) fiber lasers, and all rely on imports.

Therefore, the welding equipment is expensive, and 70% of the cost of an automatic welding equipment is the laser. The welding laser head with galvanometer** can reach 1 million RMB.

The world's laser technology is an average photoelectric conversion efficiency of 30%, and now there are also 50%, but it is very expensive, so there is no large-scale application yet. Fiber lasers output invisible laser radiation with wavelengths of 1000mm or more. According to the IEC EN 60825-1 standard, all laser systems have a fiber outlet laser class of 4.

As for the laser**, if you really understand the laser: the principle of generation, the conveying medium, the cooling system. You'll find that technology doesn't come out by blowing.

Keeping in mind that "governing the country scientifically and misleading the country by literati" is the only truth that China is moving toward prosperity and strength.

There are many uses for lasers.

After more than 30 years of development, laser is now almost ubiquitous, it has been used in all aspects of life and scientific research: laser pointer, laser acupuncture, laser cutting, laser cutting, laser welding, laser quenching, laser record, laser pointer, laser rangefinder, laser gyroscope, laser lead straightener, laser scalpel, laser bomb, laser radar, laser gun, laser cannon, etc., in the near future, laser will definitely have a wider range of applications.

2.Responsible for the development of samples and processes related to laser cutting;

3.Responsible for the commissioning of laser cutting equipment.

4.Equipment installation and commissioning.

5.Daily management of the process.