LASIK surgery Video

In the preceding article is titled how LASIK is performed is listed in the LASIK vision correction, that surgery is performed in two stages.  Corneal tissue flap is created the first time. Excimer-laser reshapes then decorate with cornea. Finally, is replaced by the Corvette to its original position.

Today, the presentation of the video is expected to repair surgery LASIK vision to understand how LASIK works.

LASIK vision correction surgery

Cornea LASIK Eye Surgery in the target:

Cornea LASIK Eye Surgery

LASIK eye surgery becomes permanently visible, depending on the size of the allocation of the power of the reshaping of excimer laser corneal surface with light. So in our view the cornea of the eye surgery, LASIK, the destination section and the simplicity of its structure and function.
The eye of the cornea is the clear crystal accessories section. The clock, Crystal, such as the cornea, a clear window to give us. It is about 1/2 mm thick (550 ± 50 micrometer) and five separate layers.
The cornea receives food, oxygen, minerals and glucose in the small vessels in the form of the outermost edge of the cornea, aqueous humor and sustainable, in parallel with the film. Nerve terminals resulting, therefore, very sensitive tissues, which is very painful, if disturbed, they also offer a full range of cornea, supplied by the cornea.

Epithelium
Corneal epithelium the outermost layer of the cornea has cells in the epithelial cells layers and consist of five to six. It provides a smooth optical surface of the barrier against infection and prevent access to the cornea of contaminants, bacteria, etc. The powers of the Epithelial cells again quickly, when the cornea is injured. However, if the damage penetrates into the cornea in the wake of enlargement, it may leave a scar. Opaque areas, leave scars cause to lose its luster and clarity of the cornea. Bowman layer
Below is the epithelium, Bowman's layer of the structure of the cell freely, which consists of a single collagen lämmöksi. Because this level is very hard and difficult to reach, it protects the cornea damage. This layer is unable to recover when the cornea is injured. Stroma
Corneal stroma in bulk is called, which consists of a single Republic in the Lao People's Democratic Republic and regularly arranged in bundles of collagen and lämmöksi together with the complex material is glued to the ground and air a few cells. Excimer laser eye surgery LASIK will remove some of the tissues of the cornea, this part of the cornea, so that the income support. Descemet membrane
Below is a list of the stroma is Descemet's membrane filters, cell free, strong, elastic Membrane filters in the corneal Endothelium, basement membrane filters. It grows throughout the entire life and turns slightly thicker advanced age. Endothelium
The cells of the endothelium is one layer of the cornea, which removes fluid. Aging, inflammation, the endothelial cells due to trauma. Endothelial cells to die and disappear, and the endothelial cells of the thin is distributed between the endothelial cell, lost count. Epithelium has other keratinized (absence of keratin protein is called) Stroma collagen fibres are organized on a regular basis, and packaged Tear film abolishes all the surfaces of the irregularities is the cornea Corneal nerves absence (the myelin is an insulating materials by electronic means) of the myelin sheath are blood vessels Corneal dried , maintained by the Endothelium
In addition, you can protect the delicate structures within the cornea to the eye, to help focus the light rays, create an image of the retina. Its manufacture is similar to the passage of light to create the image on the film Camera lens.

top 10 questions about LASIK and Corneal thickness

Corneal thickness

Corneal thickness is one of the most important factors to be taken into account when calculating your surgeon if you have a good LASIK candidate. 
Understand why LASIK corneal thickness intraocular surgery is an important one, is assumed to be the most common questions about LASIK and corneal thickness ratio.
The thickness of the cornea normally varies between people with an average of about 550 microns, (which is about 1/2 mm), the Caucasians. It is less the black (520 microns), and even less, to Western Europe.
Corneal thickness is measured by a device known as the pachymeter. The most common method is ultrasound Pachymetry, but specific description of the systems, such as the Orbscan corneal and Pentacam can also be used. The latter systems may provide a representative of the relative thickness of the cornea in different places on the map.
Is not ideal for LASIK corneal thickness. It should, however, you know that LASIK surgery to improve vision, according to the United States Census Bureau, you should have a sufficient number of corneal thickness. This amount depends on the type of Medical error.
It is important to determine the corneal thickness before the LASIK procedure, because the LASIK improves the user's perspective of reshaping your cornea and reshapes it, inter alia by deleting some of the tissues in your cornea. If the cornea is too thin, Visio can vary depending on the quality and the weak.
The depth of ablation excimer laser has been deleted is called the stroma, the middle layer of cornea tissue. If you are shortsighted, depreciation is a user in the middle of the cornea. If you have developed your cornea, from a circle.


Ablation depth depends on the amount of treatment, which in turn depends on the degree of Medical error. Size and the selected parameters in excimer laser are other factors that affect the depth of ablation.
Can we assume that, in General, with a size 6.0 mm, the excimer laser to remove each LASIK for the treatment of the tissues of the diopter of 12 microns.
If you have 4 diopters, correcting shortsightedness to Visio, for example, the depth of ablation should be 4 x 12 = 48 micrometers.
LASIK Surgeon in such a way as to ensure that, when you have created a Corvette and excimer laser corneal tissue when applying the minimum amount is not affected by changes you make to the LASIK procedure. This critical called residual Stromal bed and it is important to maintain the integrity of the user and the strength of the cornea after LASIK procedure and to avoid serious complications such as corneal LASIK ectasia.
When the U.s. food and Drug Administration (FDA) approved LASIK, it is recommended that at least 250 microns thickness should be left to the remainder of the stromal Corvette LASIK surgery pursuant to avoid corneal ectasia.
Currently, most LASIK surgeons prefer to leave the 275-300 microns for the rest of the stromal bed safety and also to add the LASIK enhancement (retreatment), if necessary.
Residual Stromal thickness is calculated by taking the Central corneal thickness before the LASIK flap thickness and by reducing and, in particular, by tilting the calculated ablation depth.
For example, if the Central corneal thickness of 550 microns in thickness flap is estimated to be 160 microns and the depth of ablation-refraction is 60 microns, the thickness of the remaining stromal bed would be 550 – (160 + 60) = 330 microns.
If you have a thin cornea and Refractive error should be corrected, it will not be able to be great to leave at least 250 microns in the stromal bed for the rest of the Corvette.
Sometimes, the surgeon can you solve this problem by creating a thinner flap, which allows more processing is carried out at least 250 microns corneal bed. A thinner LASIK flaps can be created either in the femtosecond laser during the flap Maker IntraLASIK or specific types of microkeratomes conventional LASIK.
If it is not possible to create a thinner LASIK flap, other options such as PRK, LASEK, or Epi-LASIK may be the better option for you.

How does the Z-LASIK performed?

I was asked recently to explain how the Z-LASIK Vision correction surgery is carried out in more detail.

Z-LASIK

The most important things first, what is the Z-LASIK?
Z-LASIK is one of the most advanced technology, all-Laser LASIK bladeless surgery that are available today. Z-LASIK procedure, your surgeon uses to create the Corvette LDV Femtosecond LASIK-laser Excimer laser to correct and the user's perspective of reshaping your cornea.
LDV Femtosecond laser, situated in the territory of the port, the Swiss Ziemer group, and the experience developed by the Bladeless LASIK Food and Drug Administration (FDA) approval in 2008.
Z-LASIK than with the other, if not all, of the laser LASIK LASIK procedures, create a small fast Corvette by femtosecond laser pulses of light, not a microkeratome blade.
Now suppose view this video, which describes how the Ziemer FEMTO-LDV Femtosecond Laser creates the corneal flap LASIK procedure for the Z-order.