Leo S Harf

Can I do laser vision correction again
Vision correction with the help of laser intervention is a rather popular ophthalmic operation.

About this effective method of getting rid of wearing lenses and glasses, thought everyone who has problems with vision. Surgical intervention with a laser helps to get rid of farsightedness, myopia, astigmatism and other eye diseases.

To understand the essence of laser correction, it is necessary to know the anatomy of the human optical system-the eyeball. The anterior convex part of the eye, the cornea, is a kind of lens that focuses light rays on the retina and allows you to get a clear image. Deterioration of visual acuity is usually associated with the inability of the cornea to focus light rays directly on the retina. The image is obtained on the plane in front of the retina (myopia) or after it (hypermetropia). Refractive errors are the result of irregular curvature and abnormal thickening of the entire corneal layer or its specific areas. Laser exposure corrects the thickness and shape of the cornea, significantly improving vision.

There are several technologies for laser vision correction, which differ in the method of forming a corneal flap and the method of modeling the corneal surface. The most popular technology is LASIK. The first stage of the operation is cutting off the upper layer of the cornea and creating a surface flap. Then, the section fixed on the leg is folded back in order to give access to the laser beam to the deeper layers of the cornea (stroma). Excimer laser, acting on the surface of the cornea of the eye, causes micro-evaporation. As a result of this high-precision procedure, all parameters of which are controlled by computer equipment, the shape of the corneal layer is simulated. The normal focusing of the image on the retina of the eye is restored. The final stage is the return to the place of the flap and its self-fixation due to its own collagen fibers. After correction, antibacterial drops are instilled into the operated eye.

Excimer laser surgery is an outpatient operation that is completely painless and takes only 3-5 minutes. Normalization of vision after surgery occurs 3-4 hours after the intervention, and you can return to normal life and work in 2-3 days. State-of-the-art precision technologies allow you to perform vision correction in one go. The results of the operation are preserved for a long time, and, as a rule, do not require repeated vision correction.

When additional vision correction is needed

It is extremely rare that there are cases when a repeated adjustment of the treatment is still required. Vision correction is a procedure for changing the optical ability of the eye after previously performed vision correction. The need for additional correction occurs in the following cases:

if after the operation, the expected refractive effect was not achieved, and the vision remained at the same level or became worse;
with a high degree of farsightedness, myopia or astigmatism, when repeated correction can be predicted already at the stage of preoperative examination;
the presence of general and eye diseases that reduce visual acuity;
vision correction was carried out by outdated methods many years ago (the method of incisions);
lack of accurate preoperative diagnosis or a medical error;
failure of the patient to follow the recommendations of an ophthalmologist in the postoperative period, which led to complications or a decrease in visual acuity.

The possibility of repeated intervention and the choice of correction technology is determined individually for each patient and depends on many factors. The most important indicator is the condition of the cornea of the patient’s eye. The absolute contraindication for repeated surgery is thinning of the stratum corneum. The operation is prohibited if the thickness of the cornea is less than 430-450 microns. To determine the thickness of the shell, a special examination of the eye is carried out – pachymetry. Diagnosis of the condition of the cornea allows you to identify existing abnormalities, evaluate the effectiveness of the treatment already carried out. There are several methods of conducting the survey: contact and non-contact. Both methods are painless procedures that do not require additional preparation.

Most of the general contraindications for repeated vision correction coincide with the contraindications for any surgical laser intervention:

  • glaucoma (increased intraocular pressure);
  • cataract (clouding of the lens of the eye);
  • keratoconus (protrusion of the cornea in the form of a cone);
  • inflammatory eye diseases (conjunctivitis, keratitis);
  • diabetes mellitus, endocrine diseases;
  • common inflammatory diseases (acute respiratory infections, SARS);
  • unstable mental state of the patient;
  • pregnancy and breast-feeding.

The timing of repeated surgery depends on the characteristics of the diagnosis and is determined individually for each patient. Additional adjustment in the absence of contraindications can be carried out 6-12 months after the initial operation, when vision is fully stabilized. In principle, a repeated operation to correct vision is no different from the primary intervention. The process of forming the upper flap falls out of the algorithm of the operation, if the operation is carried out after a short period of time, and the upper section of the cornea did not have time to fully take root. The operating surgeon will not need to cut it off, but only raise it. After repeated laser intervention, as a rule, the expected results of refractive correction are achieved.

At the stage of making a decision on laser vision correction, in order to prevent complications and as a result of possible repeated surgical intervention, it is necessary to:

choose an ophthalmic clinic equipped with modern diagnostic and operating equipment and highly qualified personnel;
be sure to pass a diagnostic examination on the hardware, pass tests and get detailed recommendations from an ophthalmologist on the choice of correction method;
follow all the doctor’s recommendations in the preoperative and especially in the postoperative period.

Good vision allows us to see the world in all its diversity. You need to protect your eyesight and take care of its safety every day!

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