By Asst. Prof. Dr. Nawat Watanachai
Let's talk about it with LASIK.
LASIK คือ Laser In-situ Keratomileusis .
is to correct the refraction of the cornea using a laser beam.
So,It is especially suitable for short-sighted, long-sighted, astigmatism patients.
Not suitable for people whose cornea (cornea) is uneven, such as after pterygium surgery.
that is a lot or people with corneal scars or other
LASIK is based on other methods such as lamellar rafractive keartoplasty, excimer laser photoablation. This usually involves stripping the cornea, freezing it, flattening it into the desired shape. then paste it back in again, but the problem is Frozen black cornea There is wound healing that is not very good. Corneal epithelial cells are reduced.
– Take the patient for an eye exam determine the method of dissection
– Preparation before surgery, anesthetic line or general anesthesia
If the patient appears to be convulsing
– Slice the cornea, but not all of it.
leaving one side still attached to the base then flipped out
Weakness
– FDA has not approved yet.
– Some people have to repeat 2-3 times because these things are not 100%
– Not suitable for people whose eyesight is not in the 300-800 range, because if less than 300, the discrepancy will make the result not worth it. As for people over 800, there will be insufficient results.
– Some people have complications (complication) such as having something fragments. (precipitate What would you say in Thai) to cling to the cornea, but not much. Some people have corneal wrinkling (flap wrinking), broken vision in bright light (glare), etc.
The most brutal complication (I've seen it in a review article but I haven't seen it in Thailand) is total cornea opaque. ) After doing PK, it will be bad. There are a lot of tilts. I'm threatening...
– After the procedure, some people will have a refractive error of 25-50-75, which does not require glasses or contacts, but will not get sharp vision. therefore not suitable for personnel requiring this qualification, such as vascular surgeons, Ophthalmic Surgeon etc.
Regarding LASIK, here's a little extra.
1. In case of myopia less than 300, external devices such as glasses or contact lenses should be used.
2. In cases where myopia is greater than 800 or thousands of myopia, LASIK may help some in terms
- Reduce the thickness of the eyeglass lenses you need to use (a lot)
-May be used in conjunction with lens replacement surgery. (Surgery to remove the natural lens in the eyeball to remove the artificial lens with suitable refractive power
Give a little
The case of presbyopia is the eyesight of older people (i.e. when they get older, Normal lenses that used to adjust themselves to focus on near images clearly when young will wear out. makes it impossible to focus on images that are near clearly That's why many old people use glasses to read.) LASIK I can't fix this.
The progress of this presbyopia case is currently being researched in several places, such as in Brazil or in our own Rama.
by doing Scleral expansion or other methods This one would take several years before it became widespread.
More..
Using any method that helps to see clearly in people with impaired vision, the safest way is to use glasses…..
As for the use of contact lens (CL), there will be a risk. Especially if it's not used properly, like wearing it overnight - maybe it's okay, but maybe if you've been unlucky to have a corneal infection (most common is Pseudomonas).
If a general practitioner finds a patient using CL with corneal ulcer, please refer him to an ophthalmologist immediately.
- If slow, chances are quite tragedy. It's a sad thing that's hard to fix, so it's best to use these devices. Is strictly following the instructions for use
EN 
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