Is FLAAK keratopigmentation a safe procedure?

The FLAAK technique uses certified biocompatible pigments and a high-precision femtosecond laser. The pigment is placed within the thickness of the cornea: there is no surgery inside the eye (iris, lens, retina), unlike iris implants. Like any corneal surgery, it carries risks (dryness, glare, inflammation, infection), which Dr Gozlan explains during the consultation; the preoperative assessment is there to rule out eyes that should not be operated on. Dr Gozlan has performed more than 2,000 FLAAK procedures.

Is the procedure painful?

The procedure is performed under local anesthesia with eye drops, which greatly reduce the eye's sensitivity: during the operation, you mainly feel pressure or contact. Pain or stinging is, however, common in the following hours and days: in a survey of 42 patients treated with the FLAAK technique (BMC Ophthalmology, 2023), 81% reported pain during or after the procedure. These symptoms were temporary in every case and had gone within 48 hours for about half of the patients.

How long does the operation last?

The procedure takes approximately 15 to 20 minutes per eye. It is performed on an outpatient basis — you go home the same day. Full recovery is achieved within 48 to 72 hours.

Can I choose any color?

We offer a palette of natural shades carefully selected to harmonize with each morphology and skin tone. During the initial consultation, Dr Gozlan will guide you toward the colors best suited to your face and aesthetic desires.

What are the eligibility criteria?

A prior ophthalmological consultation is mandatory. Contraindications include certain eye diseases (active glaucoma, severe keratoconus), pregnant or breastfeeding women, and immunocompromised patients. The recommended minimum age is 18 years. The complete preoperative assessment will precisely evaluate your eligibility.

Is the result permanent?

FLAAK keratopigmentation is designed to be permanent: the pigment is placed in the corneal stroma. The shade may change slightly during the first weeks as the pigments integrate into the tissue. A touch-up remains occasional; it can be done, at the patient's discretion, to adjust the shade.

What is the cost of the procedure?

FLAAK keratopigmentation costs €5,500 for both eyes, whatever color you choose, even if the procedure is done in two stages. This price includes the pre-operative consultation, the femtosecond laser procedure and certified pigments. On the day of the procedure, I give you your post-operative prescription, to take to a pharmacy, along with an eye colour change certificate to keep with your passport: when you next renew it, your new eye colour can be shown on it. For reference, the Neoris Eyes clinic list shows, as of October 2026, prices ranging from €5,500 to €7,000 for European clinics that quote in euros (source: Neoris Eyes clinic list).

→ Keratopigmentation cost in Paris: what's included and booking

→ Compare keratopigmentation prices in Europe

What is the difference between FLAAK keratopigmentation and iris implants?

Iris implants are placed inside the eye; the American Academy of Ophthalmology (AAO) has described serious complications (glaucoma, cataract, corneal damage). With the FLAAK technique, the pigment is placed within the thickness of the cornea: there is no surgery inside the eye. It is corneal surgery, with its own risks, which are explained during the consultation.

Is it possible to return to one's natural color after the procedure?

FLAAK keratopigmentation is designed to be permanent. The pigment integrated into the corneal stroma cannot be removed by a simple procedure. This is why a thorough and considered consultation beforehand is essential before any decision.

Does FLAAK keratopigmentation affect vision?

The pigments are placed in the periphery of the corneal stroma, leaving the central optical zone clear. The technique is designed to change only the apparent color of the eye. Like any corneal surgery, it carries risks (including glare), which are explained during the consultation. Regular eye check-ups remain recommended.

Evolution and Touch-Up of FLAAK Keratopigmentation

Creator: Dr Yoni Gozlan
Published: 2026-06-14T21:28:58+00:00
Keywords: touch-up

June 14, 2026 — 9 min read —Updated October 24, 2026

Illustration: patient under a sterile drape with a speculum, the surgeon's gloved hand holding an instrument

Dr Yoni Gozlan

Ophthalmic Surgeon — FLAAK Keratopigmentation Specialist

SFO · SAFIR member · Paris 16th

RPPS 10101201803 · See his background

Upcoming sessions:Nov 19 Dec 23

Evolution of keratopigmentation: will a touch-up be necessary in the short to long term? This question comes up very frequently among patients considering a permanent eye color change. Yoni Gozlan, M.D., Ophthalmic Surgeon specializing in FLAAK keratopigmentation in Paris 16, explains the behavior of pigments over time, the factors influencing color stability, the situations that may justify a touch-up, and what can be expected from the FLAAK technique.

What is the evolution of keratopigmentation and why consider a touch-up?

The evolution of keratopigmentation refers to all the changes that the color obtained after surgery undergoes, from the first postoperative days to several years after the procedure. Understanding this evolution makes it possible to anticipate whether a touch-up will be necessary in the short to long term and to approach the final result with confidence.

FLAAK keratopigmentation surgery is based on the placement of biocompatible pigments into the corneal stroma using a femtosecond laser. This process creates a precise intracorneal tunnel into which the pigment is injected evenly. Yoni Gozlan, M.D., a specialist in this corneal pigmentation surgery technique in Paris, emphasizes that the quality of the implantation directly determines the longevity of the result.

Evolution of keratopigmentation in the first weeks: will a touch-up be necessary in the short to long term?

During the days and weeks following the procedure, the evolution of keratopigmentation goes through several natural phases:

Initial inflammatory phase (Day 1–Day 7): Mild corneal edema may give the impression of a more intense or slightly hazy color. This phase is temporary and does not predict the final result.
Progressive stabilization (Day 7–Day 30): The edema subsides, the cornea regains its normal transparency, and the shade appears with greater clarity. It is at this stage that the patient begins to appreciate the actual color achieved.
Consolidation (1 to 3 months): The pigments stabilize within the stromal tunnel. Any touch-up is considered no earlier than six months after the procedure.

During recovery after FLAAK keratopigmentation, it is therefore normal to observe slight color variations. These fluctuations do not mean that a touch-up will be essential. Understanding the evolution of keratopigmentation: will a touch-up be necessary in the short to long term? requires patience during this healing period.

Long-term pigment stability: key factors in the evolution of keratopigmentation

The question of the evolution of keratopigmentation over the long term depends on several fundamental parameters:

Quality of biocompatible pigments: The pigments used in the FLAAK technique are specifically formulated to resist biological degradation. Their mineral composition ensures strong chemical inertness within the intracorneal environment, significantly limiting the phenomenon of resorption.
Depth of implantation: The femtosecond laser creates a tunnel at a calibrated depth within the stroma, the avascular zone of the cornea. This absence of blood vessels reduces the risk of migration or phagocytosis of the pigment particles.
Chosen color and density: Certain shades, particularly the lighter ones, may experience slight fading over the years. The colors chosen in FLAAK keratopigmentation therefore influence the durability of the result and the likelihood of an eventual touch-up.
Natural iris color: A dark iris requires a higher pigment density to achieve a visible change. This greater density paradoxically contributes to better retention over time.

Yoni Gozlan, M.D. evaluates each of these parameters during the preoperative consultation in order to propose a treatment plan aiming for the best possible stability. Patients frequently ask about the evolution of keratopigmentation: will a touch-up be necessary in the short to long term? The answer depends largely on these factors.

Evolution of keratopigmentation after several years: will a touch-up be necessary in the short to long term?

The color obtained with the FLAAK technique is designed to last. However, the evolution of keratopigmentation over several years may vary from individual to individual:

Minimal pigment resorption: In some cases, a very slight decrease in color intensity may occur after 5 to 10 years. This phenomenon, documented in the literature, generally remains subtle and often imperceptible to the naked eye.
Complete maintenance: Many patients show no detectable change in shade, even after several years. The stability of the operated eye color and resorption over time remains a key strength of the FLAAK technique.
Evolving aesthetic preferences: Some patients may wish for a touch-up not because of color loss, but to slightly modify the shade or intensify its brilliance. This is then a personal choice rather than a medical necessity.

When patients inquire about the evolution of keratopigmentation: will a touch-up be necessary in the short to long term? he provides an evidence-based, individualized answer.

How is a FLAAK keratopigmentation touch-up performed?

When the evolution of keratopigmentation justifies a touch-up, the procedure is essentially identical to the initial surgery:

Step 1: Comprehensive control assessment

Yoni Gozlan, M.D. performs a complete corneal examination including topography, pachymetry, and biomicroscopy. This assessment verifies corneal integrity, quantifies any pigment resorption, and confirms the feasibility of the touch-up in complete safety.

Step 2: Targeted pigment reinjection

The femtosecond laser reopens the existing stromal tunnel or creates an adjacent one if necessary. The biocompatible pigment supplement is then injected in a targeted manner into the areas that have lost intensity. The procedure remains outpatient, under local anesthesia, and takes approximately 20 to 30 minutes per eye.

Step 3: Recovery

Recovery after a touch-up is comparable to that of the initial procedure, with anti-inflammatory and antibiotic eye drop treatment for a few days. Visual recovery is rapid and the color result stabilizes within a few weeks.

Each touch-up is preceded by the same corneal assessment as the initial procedure and is only performed if this assessment confirms that it is feasible.

Preventing the need for a touch-up: Dr. Gozlan's recommendations

To optimize the durability of the result and reduce the likelihood that a touch-up will be needed, Yoni Gozlan, M.D. provides several recommendations regarding the evolution of keratopigmentation:

Follow the postoperative protocol: Rigorous application of prescribed eye drops and adherence to hygiene guidelines promote optimal healing and proper pigment fixation.
Protect eyes from UV rays: Wearing quality sunglasses with UV filters reduces the potential photochemical degradation of the pigments, contributing to the longevity of the chosen shade.
Choose the right shade from the start: A shade suited to the natural iris color and the patient's expectations, selected in consultation with the surgeon, maximizes the chances of a lasting and harmonious result.

These simple measures make it possible to get the most out of FLAAK keratopigmentation and significantly reduce the risk of needing a touch-up in the medium or long term. A touch-up remains occasional; it can be done, at the patient's discretion, to adjust the shade.

FAQ: Evolution and touch-up of FLAAK keratopigmentation

Is the color obtained through keratopigmentation truly permanent?

Yes, FLAAK keratopigmentation is designed to provide a permanent result. The biocompatible pigments implanted in the corneal stroma are chemically stable and resist biological degradation. However, the evolution of keratopigmentation may lead to very slight fading in some patients after many years. Yoni Gozlan, M.D. informs each patient of this possibility during the initial consultation.

How long after the procedure can a touch-up be considered?

A touch-up is considered no earlier than six months after the procedure, once complete color stabilization has been achieved. A touch-up remains occasional; it can be done, at the patient's discretion, to adjust the shade. Assessing the evolution of keratopigmentation: will a touch-up be necessary in the short to long term?

Is a keratopigmentation touch-up painful?

No, the touch-up is performed under local anesthesia using eye drops, exactly like the initial procedure. Thanks to the anesthesia, the procedure is generally well tolerated: most patients mainly describe a feeling of pressure. Mild ocular discomfort may be felt in the following hours, easily relieved by the prescribed treatment. Yoni Gozlan, M.D. ensures optimal patient comfort throughout the procedure.

How many touch-ups can be performed on the same eye?

The number of possible touch-ups depends on corneal thickness and the condition of the stroma. Dr. Gozlan performs a complete corneal examination before any reintervention to make sure the procedure can be performed safely.

Do all 16 available shades have the same durability?

Durability varies slightly depending on the chosen shade. Rich colors such as hazel brown or deep green tend to hold better than very light shades, due to a higher pigment concentration. The evolution of keratopigmentation is therefore influenced by this choice. Yoni Gozlan, M.D. advises each patient on the shade offering the best balance between aesthetics and longevity.

Is the touch-up included in the initial price?

The fee is fixed: €5,500 for both eyes, regardless of the color chosen. The terms for a possible touch-up are explained during the preoperative consultation, before you commit.

Does a touch-up affect vision or corneal health?

No, a FLAAK keratopigmentation touch-up does not affect visual acuity or corneal health when performed under appropriate conditions. The pigments are placed in an area of the stroma that does not participate in light refraction. Yoni Gozlan, M.D., ophthalmic surgeon and member of the SFO and SAFIR, performs each touch-up with the same safety standards as the initial procedure. The evolution of keratopigmentation: will a touch-up be necessary in the short to long term? should never be a source of concern when the procedure is performed by an experienced specialist.

When to consult Yoni Gozlan, M.D.?

Would you like to learn more about the evolution of keratopigmentation and determine whether a touch-up will be necessary in the short to long term? Yoni Gozlan, M.D. provides a comprehensive consultation including a thorough corneal assessment to evaluate the stability of your result and offer personalized advice.

📍 Consultation at Centre Laser Victor Hugo – Paris 16

Yoni Gozlan, M.D. welcomes you at Centre Laser Victor Hugo, 27 bis avenue Victor Hugo 75116 Paris to evaluate the evolution of your keratopigmentation, verify the stability of the color obtained, and determine whether a touch-up is indicated.

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