{"id":2000,"date":"2018-04-27T10:18:18","date_gmt":"2018-04-27T09:18:18","guid":{"rendered":"https:\/\/presbytie-lasik.fr\/?page_id=2000"},"modified":"2021-05-26T15:58:42","modified_gmt":"2021-05-26T14:58:42","slug":"laser-eye-surgery-process","status":"publish","type":"page","link":"https:\/\/presbytie-lasik.fr\/en\/laser-eye-surgery-process\/","title":{"rendered":"The laser eye surgery overview"},"content":{"rendered":"

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The laser eye surgery overview<\/h1>\n

A survey of the most popular procedures for getting freedom from glasses and contact lenses<\/span><\/h4>\n<\/div>
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The laser eye surgery treatments<\/h2><\/h2><\/div>

LASIK<\/h3>\n

LASIK is a surgical technique that consists of creating a corneal flap with parallel faces held by a hinge, then using the excimer laser to reshape the corneal thickness and to change its radius of curvature and therefore its power.<\/p>\n

LASIK surgery is fast. It takes less than half an hour for both eyes. We use local surface anesthesia eye drops to numb the eye during the procedure. Therefore, LASIK is painless.<\/p>\n

Photo Refractive Keratectomy (PRK)<\/h3>\n

PRK consists in using an excimer laser to reshape the area of the cornea to modify the radius of curvature and therefore the power. In PRK or “Photo Refractive Keratectomy” (keratectomy means removal of a portion of the cornea), we apply the laser after removing the epithelium.<\/p>\n

The PRK procedure is quick. It takes less than half an hour for both eyes. We use local surface anesthesia eye drops to numb the eye during the process. Therefore, PRK is painless.<\/p>\n

SMILE LASIK<\/h3>\n

SMILE (Small Incision Lenticule Extraction) allows for myopic refractive correction without using an excimer laser and only using only the Femtosecond VisuMax laser. What this means for the patient is that it’s all-laser, less-invasive LASIK.<\/p>\n

SMILE consists of creating a lenticule according to the ametropia we need to correct. We then detach the lenticule from the anterior and posterior stroma plane and remove it through a small keyhole incision.<\/p>\n

The SMILE procedure is quick. SMILE takes less than half an hour for both eyes. We use local surface anaesthesia eye drops to numb the eye during the process. Therefore, SMILE is painless. It is not necessary to come on an empty stomach for any laser eye surgery procedure.<\/p>\n

PresbyLASIK<\/h3>\n

PresbyLASIK is LASIK surgery that corrects symptoms of presbyopia. We perform this form of LASIK in the same way as we do for the correction of all ametropia whether it is myopia and hyperopia (isolated or associated with astigmatism).<\/p>\n<\/div>

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The laser eye surgery technologies<\/h2><\/h2><\/div>

The Excimer Laser<\/h3>\n

A laser is a light beam composed of parallel rays (coherent light). Its power, wavelength and diameter characterise a laser. Depending on its properties, a laser can cut, burn or vaporise the material.<\/p>\n

In ophthalmology, we use different lasers depending on the ocular structures we aim to treat (retina or cornea).<\/p>\n

The excitation of two gases produces the excimer laser beam (a contraction of excited dimer). Stephen Trockel, an American surgeon, developed it for eye applications in 1983. The excimer laser was the only laser used to perform ablative refractive surgery since 1985.<\/p>\n

The excimer laser removes material (from the cornea in this case) by vaporising it. Its wavelength is in the ultraviolet spectrum (193 nanometers). In practice, the excimer laser is a device that has a series of mirrors that direct the light beam on the cornea with an accuracy of the order of two-thousandths of a millimetre (0.2 microns).<\/p>\n

On average, each impact removes a corneal thickness of 0.2 microns over a diameter of 1 to 2 mm. The number of laser impacts varies according to the importance of the refractive disorder and the distribution of laser impacts on the cornea varies according to the refractive disorder we aim to correct.<\/p>\n

The Femtosecond Laser<\/h3>\n

The relatively recent use of a femtosecond laser in ophthalmic surgery, and in particular in refractive surgery allows, above all, an increase in the safety of the techniques and an improvement of postoperative results. The United States by the FDA approved this laser in 1999.
\nIt is a solid-state laser that works in the infrared spectrum and that allows us to cut the cornea according to a predetermined pattern (like we used to do with blades). Therefore, since the femtosecond laser makes blades redundant, it offers the possibility of all-laser surgery.<\/p>\n

The femtosecond laser was invented in the early 80s. The main feature of this device is to work with extremely short pulses, of the order of femtosecond, or 10-15 seconds (0.000000000000001 seconds). This low pulse duration avoids thermal effects. The laser beam works by delaminating the material.<\/p>\n

We use the femtosecond laser in LASIK for creating the corneal flap of the desired shape and depth with better predictability, greater safety, greater asepsis and greater comfort for the patient.<\/p>\n

We also use the laser to make intra-corneal tunnels for the placement of rings for the treatment of keratoconus or corneas at risk. By using the femtosecond laser, we are confident that the rings will be at the same depth.<\/p>\n

Finally, we use the femtosecond laser in the SMILE technique for creating the intrastromal refractive lenticule.<\/p>\n

The advantages of the femtosecond laser are:<\/p>\n