Healthy popular science, look in light of [cure of 100 families name] !
When laser treats myopia to just appeared, because canthus film is cut,many people worry thin, old hind can appear a few secondary action that cannot expect at that time. Went more than 10 years nowadays, most propbably is very much the person will be curious: Went now so old, did the first batch of laser treat myope occurrence sequela?
Laser treatment myopia is a kind of when begin the remedial myopia that rise in last few years new method. At present of clinical more application is art of cutting of cornea of optics of accurate element laser (PRK) .
Operation principle:
Adjusting below relaxation condition, the focusing after eyeball of parallel light classics bends optical system is before retina, call myopia. Because this kind of eye can look only,cannot look nearly far. When this kind of eye is resting, after the Qu Guang of the eye of parallel smooth course that comes from infinite far fastens refraction, before retina collect composes a central issue, form not clear elephant on retina, far-sighted force is reduced apparently, but myopic power is still normal.
Dai Jin inspects the friend of lens to know, spectacles for nearsighted persons is one side concave mirror, narrow namely lens. Degree is higher, the contractible multiple of this contractible lens is bigger:
This piece of graph can see its principle: The nearsighted patient change as a result of crystalline lens and eyeball, umbriferous before leaning, after adding concave lens umbriferous those who call is new return retina to go up, produce clear picture.
The cornea that surgery of so myopic laser is a person actually becomes a concave lens:
First cornea cortical poke, show inside as jelly the corneal matrix with general transparent softness. Use accurate element laser next vaporization of one part matrix, make cornea attenuates, form concave lens. Next cortical break up, the operation is finished.
This kind of laser makes in cutting of the Central Bank in cornea corneal surface layer forms a concave side, reduce diopter correct to face up to force thereby, cutting deepness occupies the 1/10 left and right sides of corneal ply only, cutting kitchen surface is even and slick, do not form any spot thin etc. This operation agrees with the age is in 18 ～ is 50 years old, close diopter is in - 20. 00D is the following, astigmatism is spent do not exceed 5. 0D, far diopter is in ＋ 4. 0D is the following, and myopia spends several stability be in two years of above, but the except of all myopia patient of concerned eye disease and systemic system disease, its drip inside before main measure is art 10 minutes of eyes exterior narcotic, raze is corneal the epithelial tissue central, this method controls next automatic cutting in the computer, about 30 seconds are finished, drop of the further consultation with a doctor after art uses the eye ointment or eyedrops that fight bacterium and hormone. The complication after art is scarcer, individual patient has dazzle, low correct and cross correct, hormone sex glaucoma. Anyhow, PRK operation still is to forecast a gender at present strong, stability is tall, on the safe side, treat myopic method effectively, its excel is other art of myopia correct forehand, be accepted by most patient place.
Why oculist still can wear glasses, mean laser surgery to treat myopia insecure?
Any operations have a risk, laser surgery is not exceptional also, may fail, it is aggravating even, some laser surgery still can bring about retina to come off, the severe case such as eye ground haemorrhage, glaucoma happens, anyhow, laser surgery did not reach the degree of absolute safety. This special the level that relies on operation doctor, but opposite for a very mature still technology, overall for it is safe and effective.
As to why does oculist wear glasses even?
Actually, a lot of oculist became laser operation early (what here points to is those myopia) , be not puzzled by propagandist place of the small number of people, those do not do, because oneself feel degree is not bad,have a plenty of, because do not accord with operation index,have a plenty of.
18 ～ is 50 age of 1. phototropism operation years old. 18 years old of the following adolescent had better not be done, old people of 50 years old of above often the result is bad.
2. is myopic 100 ～ 1500 degrees, far-sighted 100 ～ 600 degrees, astigmatism 600 degrees the following.
3. diopter counts stability 2 years or so.
4. is healthy, without disease of anxious chronic eye.
The patient of contented above condition suits to become operation of cornea of accurate element laser.
Anyhow, must consult a doctor, had done before the operation evaluate adequately.
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