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Cirurgia refractiva

miopia

Miopia

És una condició normalment hereditària, que provoca que els objectes es vegin clars de prop i borrosos de lluny. La causa més freqüent és que l'ull és més llarg del que hauria de ser normalment o la còrnia és massa corba, llavors els rajos de llum convergeixen abans d'arribar a la retina, donant lloc a una imatge borrosa.

En la miopia, els rajos de llum convergeixen per davant de la retina, no sobre ella

Hipermetropia

hipermetropiaEn aquest defecte el rajos de llum convergeixen darrere de la retina ja que l'ull és més curt del que és habitualment o la còrnia massa plana, al contrari que en la miopia, donant lloc a una imatge borrosa principalment d'aprop.

En la hipermetropia, els rajos de llum convergeixen per darrere de la retina

Astigmatisme

Astigmatismo

Quan algú té astigmatisme significa que la còrnia està més corbada en un eix que en un altre.

Per entendre-ho diríem que la còrnia té més forma de pilota de rugby que no pas de futbol.

Produeix visió borrosa a qualsevol distància, causant una distorsió de la imatge semblant a la dels miralls on et veus més alt, més ample o més prim. Pot presentar-se sola o associada a miopia o hipermetropia.

En l'astigmatisme, les irregularitats en la curvatura fan que les imatges es vegin deformades.

  • What are the risks?

    In spite of the commendable results, this type of surgery should not be undertaken without serious consideration, for, even though they are rare, risks are run. Nocturnal glare, difficulties in raising the corneal flap, undercorrection and overcorrections are the main ones. Nocturnal glare is most commonly observed in people who are particularly short-sighted, but has become much less so since the introduction of Zyoptix to sharpen vision.

  • May a second operation be necessary?

    Ten per cent of people, especially those with more than five dioptres, require further treatment to correct the remains of the defect. Normally, this second operation will be performed when the gradation is stable, often 6-12 months after the first one. Thanks to Zyoptix, there has been a considerable fall in the number of severely short-sighted people who have to return for a second operation.

  • What will happen if I blink or my eye moves during the operation?

    During the operation the eyelids are held open by a speculum and eye movement is monitored by a computer with which the laser is fitted.

  • How long does the operation last?

    An operation on each eye lasts approximately 10 minutes.

  • From what age should I undergo surgery?

    Surgery should be undergone from the age of 20 onwards at the point when gradation has remained stable for at least one year.

  • When can I begin to lead a normal life again?

    Sight is very swiftly regained within the first 24 hours, so you can go back to work the day after the operation.

  • Can both eyes be operated on in the same day?

    Since the eyes do not need to be covered and the sight comes back exceptionally fast, both eyes are normally treated at the same time with Zyoptix. If the patient wishes to have them treated on separate days then they may do so.

  • How long before the operation should I stop wearing my contact lenses?

    At least 15 days prior to the operation although this may vary depending on the type of lenses being worn.

  • What precautions must be taken after the operation?

    The patient must use antibiotic eye drops and artificial tears for the next seven days after the operation. The artificial tears should be used for several weeks.

    You should not rub your eyes for a month after the operation.

    If you are to partake in sports -which you may- you must wear eye protection.

    Make-up is not to be worn for the first month after the surgery.

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