What is anisometropia?
We talk about corneal laser refractive surgery when we are referring to the group of surgical techniques that use a laser to modify the curvature of the cornea and correct refractive errors of the eye (myopia, hypermetropia and astigmatism) and thus eliminate, or at least reduce, the patient's dependence on glasses and/or contact lenses.
Because of its reliability and safety, refractive laser surgery is the most commonly used method for correcting mild and moderate refractive defects.
Astigmatism is characterised by the fact that the eye is unable to form a clean image of an object because the power of the optical system varies between the highest and lowest degrees of power.
In hypermetropia, objects in the distance are focused behind the retina, this makes close objects look blurred.
Myopia is a change in refraction whereby objects in the distance are focused in front of the retina and not on it, causing blurred farsight.
PRK (Photorefractive Keratectomy)
LASIK (Laser-Assisted in Situ Keratomileusis)
SMILE (Small Incision Lenticule Extraction)
It is important to conclude that there are neither better or worse techniques in this field, given that the most important factor is to determine which technique best suits each patient. A proper diagnosis is key.
The pre-operative period
Frequently asked questions
Refractive laser surgery is generally performed from the age of 18 due to a series of factors including:
The surgery requires some cooperation from the patient to avoid intraoperative complications. It is a surgical procedure that is normally performed under local anaesthetic while general anaesthesia should be used on a child.
Refractive errors like myopia must be stable to have this surgery. Let's recall that the operation corrects myopia but does not stop its progression, therefore, the patient's myopia must not have increased for a minimum of two years, which usually happens, in the majority of cases, from the age of 18. Otherwise, the myopia could continue developing meaning the child would need glasses once again.
Therefore, in general, it is recommended that the myopia and/or hypermetropia is corrected using glasses or contact lenses until the error is stable. In very select cases where the child has a significant different in prescription between one eye and the other, and because of very different circumstances conservative treatment to avoid amblyopia and/or lazy eye cannot be performed, surgery has been undertaken with varying results.