Vision After FLAAK Keratopigmentation: Blur, Light and Acuity

Will I see as well after the operation? For many patients, that question comes even before the choice of colour. Vision after keratopigmentation with the FLAAK technique goes through two phases: a few days of blurred vision and light sensitivity, which are part of normal healing, followed by vision that, in published studies, remains comparable to what it was before surgery. Yoni Gozlan, M.D., ophthalmic surgeon in Paris, has operated on more than 1,000 patients over more than 10 years. Here he explains, without downplaying or dramatising, what is normal, what the studies show, and when you should contact him.

Vision after keratopigmentation: the key points

• The centre of the cornea, through which the light that forms the image passes, is not pigmented.
• Blurred vision, watery eyes and light sensitivity are common in the first days. They are usually temporary.
• In a prospective study of 166 eyes, visual acuity and visual field were not significantly changed at 12 months. Contrast sensitivity was slightly lower in dim light, while staying within the normal range.
• Some signs mean you should contact Dr Gozlan straight away: pain that gets worse, loss of vision, intense redness, discharge.

Why keratopigmentation spares the centre of your vision

FLAAK stands for Femtosecond Laser-Assisted Annular Keratopigmentation. A femtosecond laser creates a thin ring-shaped tunnel within the thickness of the cornea, in front of the iris, and pigment in the chosen shade is placed inside it. The central zone, in front of the pupil, stays clear: this is where the light that forms the image on the retina passes through.

The procedure is not designed to correct your sight. If you need glasses or contact lenses to see clearly today, you will still need them afterwards. It does not touch the iris, the lens or the retina: everything happens within the cornea, without entering the eye.

On the other hand, the pigmented ring acts like an artificial pupil with a fixed diameter. As the French National Academy of Medicine points out, this can make it harder to examine the outer edges of the retina during future eye exams. The diameter of this central zone is one of the parameters discussed during your pre-operative assessment.

Blurred vision after keratopigmentation: the first days

Slightly blurred vision right after the procedure is expected. Several factors add up: mild swelling of the cornea, reflex tearing, the prescribed drops and ointments, and light sensitivity that makes you squint.

As a rough guide, this is how things usually progress:

• On the day and the day after: hazy vision, watery eyes, sensitivity to light. Have someone accompany you and do not drive.
• Over the following days: gradual improvement; most everyday activities become possible again.
• After one to two weeks: vision is usually comfortable again. The colour itself keeps settling for a few weeks (see our article on why the colour looks so intense right after surgery).

Every cornea heals at its own pace. Using your drops as prescribed, not rubbing your eyes, and avoiding dust and swimming pools in the first days all help. Our article on recovery after FLAAK keratopigmentation goes through the healing period day by day.

Glare and sensitivity to light

In a survey of 42 patients treated with the FLAAK technique in Paris (BMC Ophthalmology, 2023), 56% reported glare after the procedure. It was temporary in every case: it had gone within 48 hours for about half of them, and when it lasted longer, the median duration was 7 days. No patient reported halos.

In an older series of 234 eyes treated with various keratopigmentation techniques (British Journal of Ophthalmology, 2018), light sensitivity was the most common complaint among patients who had a complication; it had resolved by 6 months in most of them.

In practice: wear filtering sunglasses in the first days, then outdoors for as long as you feel the need. Our article on sun and UV after FLAAK keratopigmentation covers these precautions. Light sensitivity that gets worse instead of better is a reason to let Dr Gozlan know.

Acuity, night vision and visual field: what the studies show

The most important question is the long term. A prospective study on cosmetic femtosecond-laser keratopigmentation (American Journal of Ophthalmology Case Reports, 2025) followed 166 eyes for 12 months. Its findings:

• Visual acuity: no significant difference between before surgery and 12 months after.
• Visual field: no significant difference.
• Contrast sensitivity: a slight decrease, mainly in low light (dusk, night), while remaining within the normal range.
• Corneal endothelial cells: a slight average decrease.

The authors conclude that these slight decreases should be discussed with patients before surgery, and that is what we do. In everyday terms, some people may find night vision a little less crisp, for example when driving in the rain. Raise this during your consultation, especially if you drive a lot at night.

These data are encouraging, but long-term experience with purely cosmetic keratopigmentation is still limited, as both the French National Academy of Medicine and the American Academy of Ophthalmology (AAO) emphasise. The AAO also lists loss of vision among possible complications, particularly after a severe infection. All the risks are set out in our article on keratopigmentation risks, side effects and contraindications.

When should you be concerned?

Moderate blur in the first days is nothing to worry about. Contact Dr Gozlan without delay, however, if you notice:

• pain that increases instead of easing, or does not respond to simple painkillers;
• a sudden drop in vision, or a shadow appearing;
• intense redness or discharge;
• light sensitivity that is getting worse.

These situations are uncommon, but prompt treatment limits the consequences of a complication. In an emergency, contact Dr Gozlan immediately and, if needed, the nearest eye emergency department.

After the procedure: your questions about your vision

Behind "my vision is blurry" there are often other questions: is this normal? did I follow the instructions properly? The same symptom can be harmless in one person and need checking in another. That is why it is better to ask one question too many than to keep a worry to yourself.

Later on, remember to tell any eye doctor who examines you that you have had keratopigmentation, and to tell the radiologist before any MRI scan.

Before surgery: checking that your eyes are suitable

A full eye examination comes before any decision: visual acuity, corneal topography and thickness, endothelial cell count and examination of the back of the eye. If a contraindication is found, the procedure does not go ahead. Our article on the pre-operative consultation explains these tests.

For a first indication, you can take our two-minute eligibility test and preview the shade you have in mind with the colour simulator. Surgery takes place at the Centre Laser Victor Hugo, 27 bis avenue Victor Hugo, 75116 Paris, during scheduled operating sessions. The price is €5,500 for both eyes (see the detailed cost).

To understand each step of the procedure, see our overview of the FLAAK technique. A question about your vision or your own situation? You can message Dr Gozlan directly on WhatsApp.

Sources

• Alio J, Sanginabadi A, Hojabr AT, Jafari B. Femtosecond laser-assisted keratopigmentation outcomes for pure cosmetic purposes. Am J Ophthalmol Case Rep. 2025;38:102297.
• Alafaleq M, van Haselen R, Ferrari F. The safety and effectiveness of a novel annular keratopigmentation technique; a cross-sectional survey of patients. BMC Ophthalmol. 2023;23:292.
• Alió JL et al. Keratopigmentation with micronised mineral pigments: complications and outcomes in a series of 234 eyes. Br J Ophthalmol. 2018;102(6):742.
• French National Academy of Medicine, "La kérato-pigmentation des yeux : un essor qui n'est pas sans risques", press release, 18 June 2025.
• American Academy of Ophthalmology, warning on the dangers of eye color-changing procedures, 29 January 2024.

Further reading

• Recovery after FLAAK keratopigmentation: the healing period day by day.
• Is FLAAK keratopigmentation painful?: what you feel during and after the procedure.
• Sun and UV after FLAAK keratopigmentation: the precautions to take.
• Keratopigmentation: risks, side effects and contraindications: a sourced overview.

This article is for general information only. It does not replace a medical consultation: only an eye examination can assess the benefits and risks in your particular situation.