Refractive Surgery in Valencia
It is a refractive error caused by irregularities in the corneal surface (it has different curvature ratios instead of being spherical). This results in light being dispersed and focusing on various focal points on the retina, instead of just one.
Astigmatism symptoms may include blurry vision at any distance, distorted vision areas, eye strain, headache or eye discomfort. It can also cause patients to squint their eyes to be able to see things clearer.
It is possible to roughly assess corneal surface irregularities using this self-test. To do so, follow the instructions given below:
- Click on the image above in order to zoom it in.
- Observe it at a distance where you are able to see the whole image.
- Cover one eye and look at the centre of the image.
- Repeat this covering your other eye.
If you have mild or no astigmatism, every line will appear to be equally intense and defined. If you have astigmatism, you will see one or two more prominent lines, while the other ones appear to be blurred. The more severe the astigmatism, the more prominent those lines will be and the more blurry the other ones will be.
- Simple Astigmatism - Only one axis is affected. One axis focuses on the retina, while the other one is located behind or in front of the retina.
- Compound Astigmatism - It occurs in association with myopia or hyperopia. Both axis focus behind or in front of the retina.
- Mixed Astigmatism - One axis focuses in front of the retina (myopic) and the other one behind the retina (hyperopic).
Astigmatism can be corrected with glasses, contact lenses or refractive surgery in those cases where the patient does not want to use optical correction.
A variety of surgical techniques can be applied to correct astigmatism. In order to obtain the best results, a personalized examination is necessary to adapt the treatment to the specific characteristics of the patient’s eye.
Nowadays, the quicker and simpler procedures for astigmatism correction are those that alter the corneal surface using Excimer laser. To do so, we use the most reliable technology available in the ophthalmology sector (Tissue Saving, Wavefront Guided Laser…), which allows us to reduce any risks and optimize results.
If any condition contraindicates laser surgery, an intraocular lens with the refraction power needed can be implanted between the cornea and crystalline lens.
If astigmatism occurs in association with other refractive errors such as myopia or hyperopia, they can both be corrected in the same procedure.
- LASIK - Laser-Assisted in Situ Keratomileusis
- PRK - Photorefractive Keratectomy
- ReLEx SMILE - Small-Incision Lenticule Extraction
When using Excimer Laser, wavefront TM system which reduces the risk of inducing higher-order aberrations can be applied.
If the patient cannot be treated using laser (due to severe refractive errors, excessively thin cornea...), astigmatism can be corrected using intraocular lens implant which, according to the characteristics of the patient’s eye, can be:
- PHAKIC LENS
- Angle-supported anteior chamber IOL
- Iris-supported anterior chamber IOL
- Posterior chamber IOL (ICL)
- PSEUDOPHAKIC LENS