refractive surgery Valencia

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    What is astigmatism?

    Astigmatism is a refractive error caused by an irregular shaping of the cornea (mismatched curves with different radius of curvature on the main axes). This causes light to be dispersed to several points of the retina instead of focusing on one point.


    Dr. Alonso clarifies the most frequent doubts regarding laser refractive surgery.

    The expertise of our medical team combined with the use of state-of-the-art technology guarantee the best results for our patients. Schedule a non-binding consultation and we will recommend you the best treatment option for your condition.

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    Symptoms of astigmatism

    Symptoms of astigmatism include blurry or hazy vision at any distance, distorted vision, visual fatigue, headaches, eye discomfort and irritation. Patients that suffer astigmatism tend to squint to see more clearly.

    Types of astigmatism

    The following types of astigmatism can be detected in patients:

    Simple astigmatism

    It only appears on one meridian. One axis is focused on the retina while the other axis focuses in front of the retina or behind it.

    Compound astigmatism

    It affects one meridian and is associated with myopia or hyperopia. Both axes focus before or behind the retina.

    Mixed astigmatism

    Light rays come to two focal points, one of which is before the retina (myopic) and the other of which is behind the retina (hyperopic).

    HOW IS

    Astigmatism is usually corrected with eyeglasses or contact lenses. Patients who do not wish to rely on optical correction may choose to undergo refractive surgery.

    Different surgery methods are available for the correction of astigmatism. A personalised monitoring of patients is required to adapt a given treatment to the characteristics of the eye.


    • LASIK – Laser-Assisted in Situ Keratomileusis
    • PRK/LASEK – Photorefractive Keratectomy
    • ReLEx SMILE – Small-Incision Lenticule Extraction

    In cases where Excimer Laser Surgery is carried out it is possible to use a customised Wavefront TM guided system which reduces the induction of high order aberrations and grants a high quality vision.


    Intraocular lens implants represent a possibility to correct refractive errors in patients whose eyes do not meet the criteria for laser surgery. Intraocular lenses may be:

    • Phakic intraocular lenses
      • Angle-fixated anterior chamber phakic intraocular lenses
      • Iris-fixated anterior chamber phakic intraocular lenses
      • Posterior chamber intraocular lenses
    • Pseudophakic intraocular lens


    The expertise of our medical team combined with the use of state-of-the-art technology guarantee the best results for our patients.


    “An excellent clinic with outstanding patient care. It is clearly visible when professionals love their job. I will never change to another ophthalmologist”

    María Sempere.

    “My experience was satisfactory, results were excellent after surgery and I received special care all the time. The whole staff are great professionals”

    Carmen Valles. 

    “I had surgery in this clinic and recommend it to everyone. I received excellent treatment and care. I’ve seen few doctors as proficient and dedicated as doctor Alonso.”

    Jose Miguel Carbonell. 


    At CLÍNICA RAHHAL we want treatment to be affordable for our patients.



    Select any of the following FAQs from our patients and check the answers. If your doubts are not solved please use the contact form below to get in touch with us.

    When can I have surgery to correct myopia/hyperopia?

    Refractive errors (myopia, hyperopia, astigmatism) can only be corrected when the patient’s prescription is stabilised, which occurs around the age of 20.

    Can I have surgery if I also have astigmatism, aside from myopia/hyperopia?

    Yes, any of the procedures currently used (laser and lens implants) allow the simultaneous correction of both errors.

    What happens if my eyes move during the laser surgery procedure?

    The eye must remain as stable as possible during surgery, therefore patients lie on a treatment table with their eyes fixed on a red light on the Excimer Laser machine. 

    A safety device called eye tracker compensates for involuntary eye movements following up the eye at milliseconds intervals and adjusting the direction of the laser pulses. In case of sudden movements the safety system fully stops the treatment.

    How long does the laser surgery last?

    It is a quick procedure. Patients remain in the surgery room for 15-20 minutes on average. Just a few seconds of that time are used for the application of the Excimer Laser. The remaining time is used to prepare the patient’s eye for surgery.

    Is laser surgery painful?

    Refractive surgery procedures are carried out using topical (local) anaesthetics (eye drops). Patients do not experience any pain during the operation.

    How will the post-operative/recovery period be?

    LASIK and PRK procedures have very simple post-operative processes which require only eye drops and artificial tears.

    After surgery it is recommended to rest at least for 24 hours. Most work activities can be resumed after 48 hours. Patients must wait at least a week to resume any sport activity.

    I have a very high prescription. Can I undergo refractive surgery?

    During the pre-op check up, our medical team will examine the condition of the cornea, namely corneal width and number of dioptres to be corrected. Laser treatment vaporises corneal tissue. The amount of extracted tissue is proportional to the number of dioptres to be treated. Intraocular lens implants may be considered if prescription is very high.

    First visit

    Leave your contact info and we’ll get back to you. You will receive a confirmation email and within a few hours we’ll call you to schedule an appointment.