introduction

Femtosecond lasers are lasers with a pulse width of less than 10-12 seconds. Such lasers have attracted much attention due to their high frequency, ultra-short pulse width, and extremely high peak power. Several foreign laser giants have also launched their own fist products, which can be described as a hundred flowers blossoming, and hundreds of schools contend. For the user, the consumer can't follow the feelings, picking the eye, should be calm, be calm, keep a rational mind, according to their own needs, choose the product that suits their application. Next, let's take a look at Jenoptik Laser's D2.fs femtosecond laser as an example to see if this laser is suitable for those areas.

Medical application

The society is developing, and more and more people are sitting in front of computers and doing mental work. While high technology has increased productivity, it has also created more patients with myopia. At present, there are about 400 million patients with myopia, and they are increasing at an annual rate of 30 million. Therefore, myopia treatment is a fairly large market. Laser treatment of myopia, this word is no stranger to everyone. As early as 1985, excimer lasers were used in clinical treatment of myopia. The process is to first cut the lobes with a super-thin layer knife, and then use a excimer laser to scan a concave lens on the cornea, thereby changing its diopter to achieve the purpose of treating myopia.

Schematic diagram of excimer laser surgery

However, any surgery is risky, and 80% of the risk of myopia treatment is in the process of making the corneal flap, because the traditional flapping process is performed by human operation of the metal keratome, and human error and mechanical failure cannot be controlled. The femtosecond laser flap technology abandons the metal keratome used in traditional surgical flaps and replaces it with a computer-controlled femtosecond laser flap, which makes a qualitative breakthrough in the safety of the flapping process.

Femtosecond laser is used to make the corneal flap with the parameters such as the thickness, diameter, shape and position and width of the flap. The corneal flap is used under the precise control of the computer program. Compared to conventional mechanical corneal lamellar knives, the advantages of femtosecond lasers are:

1 The corneal flap made with femtosecond laser does not have button flaps, free, broken, etc. The thickness of the flaps is the same everywhere, and the corneal flaps are generally uniform. The corneal flaps made by the microkeratome generally have a slightly thicker peripheral portion. In the thin case, it is difficult to achieve a lamellar flap with the same thickness as the peripheral portion of the central portion, so the postoperative reduction and fixation of the keratotomy is not good.

Comparison of cutting layers between femtosecond laser and keratome

2 quantitative control, can accurately control the corneal thickness in the micron level, the accuracy is several times higher than the laminar knife. Generally, a cornea with a thickness of 90 to 100 μm is required, and the error can be within 10 μm, and the accuracy of the lamellar knife is 30 to 45 μm.

3 avoids the possibility of cross-infection caused by the blade;

4 Femtosecond laser reduces postoperative dry eye syndrome by 72% due to the uniform depth of the corneal flap and less nerves and blood vessels.

The LASIK (laser in situ keratomileusis) operation of the 5 femtosecond laser to make the corneal flap has less astigmatism and higher-order wavefront aberration than the conventional LASIK, which is important for the visual function after LASIK.

6 In the past, affected by corneal thickness, nearly 10% of patients were too deep for myopia and the cornea was too thin to receive traditional laser surgery such as LASIK. The femtosecond laser can overcome this shortcoming, even if it is a thin cornea.

Combining the above advantages, the femtosecond laser has begun to replace the metal keratome that has been used for more than 20 years in the medical field, and has taken the most important task of making a corneal flap in LASIK surgery, bringing laser myopia surgery into the pure laser era.

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