2. If it is not wavefront aberration, it is general surgery or other aspheric surgery (such as Q-value-guided personalized cutting), the treatment card is only a form of management, which is not directly related to the type of surgery. Q-value personalized cutting is to make the shape of the outer surface of your cornea as low as possible after surgery and close to the shape before surgery. Theoretically, it can make the surgical field of vision more comfortable and easier to adapt. If you still feel uncomfortable, it is possible that your discomfort will be more obvious after general surgery. Everyone's situation is different, and some people may not feel bad even after general surgery. At present, only wavefront aberration technology can significantly reduce the degree of night glare.
I'm not sure about this, but I believe the rotation is very small. In addition, a person's astigmatism axis itself is not always the same, but it will also change to some extent. In addition, people's eyelids always have a certain pressure on the cornea, which is prone to physiological astigmatism, that is, myopia astigmatism with axis 180 or 0 or hyperopia astigmatism with axis of about 90 degrees. This kind of physiological astigmatism is due to the slight deformation of cornea caused by the eyelid slightly pressing the corneal surface from top to bottom. It does not need treatment, and it is easy to recur even after surgery. Often squinting at things will aggravate the degree of astigmatism, but as long as you have good eye habits, you can return to normal, which I have personally experienced. In addition, everyone has a certain degree of astigmatism, which cannot be completely eliminated. Finally, even if the eyes roll when sitting or lying down, so many operations are enough to prove that this does not affect the correction of astigmatism, and many people can achieve quite good results.
I don't know about this, but I think your worry is really unnecessary. You are really too pursuing perfection. In fact, even the best optometrist may examine the same person twice, and the axial position of astigmatism may be different, or even the degree may be different, because the eyes are made of meat, not glass, and there is not so strong certainty. As long as you believe in so many operations, no one is affected by this factor. And your astigmatism must not be caused by the laser being deflected for this reason.
5. Disadvantages: The risk of surgery increases, and it is more difficult to make a new corneal flap than the first time, because the connection between the corneal flap and the underlying tissue is not as tight as before, and problems are more likely to occur when making corneal flaps. It will be better to use the original corneal flap, but it will test the doctor's skill and may not be able to open it completely smoothly. If it is broken, it will be more troublesome. In addition, most doctors have little experience in secondary surgery.
6. If the same surgical methods and techniques are used, the success rate of the first operation is of course high, for the reasons mentioned above. However, there is little difference in the laser cutting part, and since the second operation is needed, it must be that the first operation is not correct. From this point of view, if the second operation is successful, it is more accurate than the first operation. Why else would you do a second operation?
I can't say this. I have to check the corneal topography to know. But the symptoms of keratoconus are first big myopia, big astigmatism, and then a lot of irregular astigmatism. The most fundamental pathogenesis of keratoconus is not clear, but most of them are young people around the age of 20 (some people will have keratoconus with a corneal thickness of more than 500 microns and normal intraocular pressure, while many people will have keratoconus with a thin corneal thickness, which is never a problem). As long as there are enough corneas left after surgery and there is no such tendency for a long time, it should be no problem, but if you get some diseases with high intraocular pressure (such as glaucoma with high intraocular pressure) in the future, it is another matter. As long as it is confirmed to be keratoconus, it is more serious and not much lighter. However, by mild case, you should mean benign corneal swelling. Corneal swelling will only cause myopia, and it will not worsen as long as it is well controlled. Keratoconus refers to the deteriorated condition. But if there is corneal swelling, excimer surgery is definitely not possible.
8. As I said before, eye fatigue is not necessarily caused by astigmatism. As I also said, it may be that the pupil is too big, and the light from something enters the eyes through the non-surgical area, which interferes with the vision. Many people have this; Dry eye can also make you uncomfortable to see. If it is caused by astigmatism, it is not necessarily left by surgery. As I said before, when the postoperative vision recovered best, there was no astigmatism at all (I didn't use iris positioning or wavefront aberration; Whether it is machine optometry or self-feeling, there is really no feeling of astigmatism. So I believe that the problem you are worried about should be unnecessary), but astigmatism returned to the preoperative state one year later, and then stabilized, but myopia did not recover. But I found that good eye habits can really reduce astigmatism. I don't think the slight astigmatism has affected my vision, but my astigmatism is very slight. If I am not sensitive to it, I won't feel it. In addition, there is no other ametropia, the same 50-degree astigmatism, a person's vision is 1.5, a person's vision is 1.0. The bigger the pupil, the more obvious the visual acuity decline caused by astigmatism; In addition, vision has a great relationship with retina.
In addition, I don't think the second operation can solve dry eye. You have to find another way to solve dry eye. If you really need a second operation, you must also explain the situation to the doctor and see what the doctor thinks.