When need surgery, myopia, farsightedness, astigmatism?

People with nearsightedness, farsightedness, astigmatism often go to medical facilities for lasik surgery. But not everyone wants surgery and there are cases after surgery to wear glasses . Why? Dr. Nguyen Huu Chuc - Deputy Dean of Cho Ray Hospital - said:

Prepare before lasik surgery for patients (Photo: KS)

- Currently excimer laser surgery (lasik method) is considered the most effective. Depending on myopia, farsightedness or other refractive errors, laser energy is used to alter the optical capacity of the cornea. It is indicated for myopia from -1D to - 20D, presbyopia from +1 to +10 D, astigmatism from 1D to 7 D, presbyopia according to PAC (Pseudo Accomodative Cornea) method. Patients with myopia (surgery) must be over 18 years old, have stable access.

Contraindicated in cases: acute or chronic ocular diseases such as conjunctivitis, keratitis, uveitis, glaucom, corneal cornea; There are systemic diseases that affect surgery, are pregnant or during lactation because during this period it may affect changes in postoperative adjustment.

* Why do some postoperative cases still need to wear glasses?

- It is because myopia is too heavy, the ability to adjust by surgery is not over. Because the corneal thickness does not allow for complete refraction adjustment. In patients close to 7 diopters can change their lifelong lifelong, but after surgery, the level may still change. In patients with dislocated corneal or corneal thickness, there is no indication for surgery. Therefore, it is necessary to be serious and correct of physicians, to examine accurately before surgery and to give adequate and responsible advice to patients.

* Do patients who are dazzled after lasik surgery have difficulty reading?

- First time after surgery, if you are dazzled, you should wear sunglasses. At night also wear lighter shades. This blinding phenomenon after 3-6 months may be lost or the patient has adapted. However, dazzling only happens with older generation lasik surgery machines.

In Cho Ray Hospital, the excimer laser refractive surgery unit has just been formed, officially put into operation in mid-July 2006. EC-5000 CXIII laser machine newly produced in 2005 with a software system has many advantages in presbyopia, astigmatism and combined refractive errors. After loading the patient's information into the machine, the machine will give the parameters of the corneal thickness, the degree of flatness of the cornea, find the axis on the astigmatism eye .

Since then, the machine has been very accurate on surgery program, overcoming the shortcomings of previous generations, especially minimizing the phenomenon of dazzling after surgery.

By the way, I would also like to advise the young people to keep their eyes. At present, at the age of primary and secondary school students are most prone to myopia, especially in urban areas is higher than in rural areas. It is best to be prevented by: the classroom must be well lit, the chair and the table are proportional to the height of the student. When reading a book, it should not be too close to the eyes (below 35cm), the posture should be correct (not lying). Do not sit in front of a computer monitor or TV for too long (over an hour) .

KIM SON performs