Excimer laser correction
According to the World Health Organization, every third inhabitant of the planet, unfortunately, forced to wear glasses or contact lenses.
The whole history of "corrective surgery was associated with the search for a safe, secure and stable method of correction, allowing all to get rid of dependence wear glasses and contact lenses.
And finally - what the third millennium, a new method to solve this problem - it excimer laser correction, which removes people from nearsightedness, farsightedness and astigmatism. Laser correction for the first time meets all the requirements of a person with "bad" eye. Scientific validity, painless, maximum security, stability of results - these are unconditional factors, which have been characterized. Field ophthalmosurgery engaged in correcting these anomalies, called refractive surgery, and they - refractive errors, or refractive error.
Experts identify two types of refractive errors:
- Emmetropia - normal vision;
- Refractive error - abnormal vision, which includes several types: myopia - nearsightedness, hyperopia - farsightedness, astigmatism - image distortion when the curvature of the cornea and irregular course of the light rays at its different sites varies. Astigmatism is myopic (nearsighted), hypermetropic (farsighted) and mixed.
To understand the essence of refractive interventions, very brief and sketchy recall anatomical - physics of the eye. The optical system of the eye consists of two structures: svetoprelomlyayuschaya part - the cornea and lens and svetovosprinimayuschaya part - the retina, located at a particular (focal) distance. To the image was sharp and clear, the retina should be the focus of optical power in the world. If the retina is located in front of focus, what happens when farsightedness or behind the focus in the short-sightedness, the image objects will be blurred and indistinct. At the same time from birth up to 18-20 years of eye optics is changing due to the physiological growth of the eyeball and under the influence of factors that often lead to the formation of various refractive errors. Therefore, refractive surgery patients increasingly becoming a person who is at least 18-20 years.
At the heart of excimer laser vision correction is the program "a computer reprofiling of the surface of the main optical lens of human eye - the cornea. For individual program correction cold beam "smooths" the cornea, removing all existing defects. It formed the normal conditions for optimum light refraction and to obtain an undistorted image in the eye, as people with good eyesight.
The process of "converting" is not accompanied by a disastrous rise in temperature corneal tissue, and how many people mistakenly believe nor any "burning" is not happening. And most importantly, excimer laser technology can get so "perfect given the new profile" of the cornea, which enabled them to correct almost all types and degrees of refractive errors. Speaking the language of science and excimer lasers - high-precision systems that provide the necessary "photochemical ablation (evaporation) layers of the cornea. If tissue is removed in the central zone, the cornea flattens, that corrects nearsightedness. If you evaporate the peripheral part of the cornea, then the center will be more "cool" that allows you to correct the farsightedness.Metered removal in different meridians of the cornea can correct astigmatism. Modern lasers used in refractive surgery
