"Myopia laser surgery is not for everyone", which is Beijing Jia Department of Ophthalmology doctors for every short-sighted friend's advice. Every month, many patients because they do not meet the conditions of the surgery by the hospital refused surgery.

Under 18 years of age do not do the degree of instability

  "Doctor, must help me take off glasses," a man who will ascend to the high school senior girls before checks on the firm expressed surgery determination. Because she wants entrance newspaper professional vision requirements more stringent, so the 400 degrees of myopia she thought the hospital excimer laser surgery to eliminate myopia. Because young people under 18 years of age are in body growth, eye refractive state of instability, the degree of increase is still possible, therefore, as blindly underwent surgery a couple of years and goes back to the vision is likely to retreat, patients may again wearing glasses or face a second surgery.

   Do not do too thin cornea

    25-year-old IT worker Liu would like to take issue on vacation want to excimer laser surgery to solve the glasses. However, preoperative examination found that her eyes cornea is too thin, the eyes of "quality" is not suitable for surgery, has also been good to sink Pan Zhuren rejected.

Excimer laser surgery for myopia is controlled by computer laser beam, requires surgery to have a certain thickness of the cornea, some long-term wear contact lenses may be worn on the cornea to a certain extent. But the thickness of the cornea varies, depending on the personality of a congenital condition, was born on the cornea is thin, unfit for excimer laser surgery. Therefore, we must conduct a rigorous preoperative examination to determine the appropriate corneal thickness and no contraindications to do.

 Preoperative examination unqualified person can not do

    Excimer laser surgery in addition to routine preoperative examination, should note the following:

    1, after a possible glare, poor night vision Reason: Preoperative pupil dark environment greater than 6.5mm; preoperative spherical equivalent degree greater than -10D; preoperative higher-order aberrations too large.

    2, postoperative dry eye appear: Preoperative strict tear-related checks, such as tear film breakup time, Schirmer test and so on.

    3, for postoperative rollback phenomenon: Preoperative spherical equivalent greater than -10D.

    4, preoperative corneal thickness of less than 450μm.