The eligibility criteria for surgery for myopia or astigmatism vary according to the different types of surgery. In general, to be eligible for refractive surgery, it is usually necessary to meet the following criteria:

Have reached a stable prescription for glasses or contact lenses.

Be at least 18 years old or be at least 21 years old for certain surgical techniques.

Have good overall eye health, free from eye diseases such as macular degeneration or cataracts.

Have an appropriate corneal shape for the chosen surgery.

Have realistic expectations about the results of surgery.

It is important to note that these criteria may vary depending on the type of surgery and the country in which you are located. It is recommended that you consult an experienced ophthalmologist to assess your eligibility for myopia or astigmatism surgery.