ReLEx SMILE vs LASIK: Should You Choose the Newer Technology?

How Each Procedure Works

LASIK (Femto/Contoura): A femtosecond laser creates a thin corneal flap. The flap is lifted, an excimer laser reshapes the underlying cornea, then the flap is repositioned. Healing is fast.

ReLEx SMILE: A femtosecond laser creates a small lens-shaped piece (lenticule) inside the cornea, then a 2-4 mm 'keyhole' incision through which the lenticule is removed. No flap is created. The cornea remains structurally stronger.

SMILE uses ONE laser; LASIK uses two (femtosecond + excimer).

Side-by-Side Comparison

Procedure time: - LASIK: 10-12 minutes both eyes - SMILE: 10-15 minutes both eyes

Visual recovery: - LASIK: Sharp vision in 4-6 hours - SMILE: Sharp vision in 24-48 hours (slightly slower initially)

Return to work: - LASIK: 24-48 hours - SMILE: 24-48 hours

Return to contact sports: - LASIK: 4-6 weeks - SMILE: 1-2 weeks (no flap to displace)

Dry eye risk: - LASIK: Usually temporary; persistent dry eye in a minority - SMILE: Generally lower than LASIK

Cost (both eyes, India 2026): - Femto LASIK: ₹50,000-₹65,000 - Contoura LASIK: ₹1,40,000-₹1,90,000 - ReLEx SMILE: ₹1,70,000-₹2,20,000

Where SMILE Wins

Better for active lifestyles: No flap means no risk of flap displacement from trauma, contact sports, or eye rubbing. Often suited to boxing, martial arts, military, defence, athletics.

Lower dry eye rates: SMILE preserves more corneal nerves than LASIK, leading to less long-term dry eye.

Stronger cornea biomechanically: Less corneal weakening since no flap is created. Important for borderline-thin corneas.

Faster return to high-impact activities: 1-2 weeks vs 4-6 weeks for LASIK.

Smaller incision: 2-4 mm vs 18-22 mm for LASIK flap.

Where LASIK Wins

Faster initial visual recovery: Sharp vision in 4-6 hours vs 24-48 hours.

Treats wider range of prescriptions: LASIK can treat hyperopia (+5.0 D) and very high astigmatism (-5.0 D); SMILE primarily treats myopia (-1.0 to -10.0 D) and astigmatism up to -5.0 D. Newer SMILE platforms (VISUMAX 800) treat hyperopia in some markets but not yet widely in India.

Cost: Standard Femto LASIK is ₹1+ lakh cheaper than SMILE.

Topography-guided customisation (Contoura): Currently offers more customisation options than SMILE.

Easier enhancement procedures: If a touch-up is needed later, lifting the LASIK flap is simpler than re-treating after SMILE.

Longer track record: 25+ years of LASIK data vs 12 years of SMILE.

Who Should Choose Which

Choose ReLEx SMILE if: - You play contact sports (boxing, MMA, wrestling, rugby) - You're in defence forces, police, or active military - You have moderate dry eyes pre-surgery - You have borderline corneal thickness - Your lifestyle involves a lot of eye rubbing or trauma risk

Choose Contoura/Femto LASIK if: - You want the fastest possible visual recovery - You have hyperopia or very high astigmatism - Cost is a meaningful factor - You want maximum customisation (Contoura's 22,000-point mapping) - You're a busy professional who needs to return to work fast

A proper consultation determines what's medically right for your eyes.

What Is ReLEx SMILE Surgery? A Patient's-Eye View

ReLEx SMILE is flapless laser eye surgery in which a single femtosecond laser shapes a thin, lens-shaped piece of tissue (a lenticule) inside the cornea, and the surgeon removes it through a small incision. Removing the lenticule changes the cornea's curvature and corrects your power.

What it feels like on the day:

1. Numbing drops are put in; there are no injections and you stay awake.
2. A curved contact glass rests gently on the eye and holds it steady with light suction. Your vision dims briefly.
3. The laser works for a short time while you look at a target light — there is no smell of burning, as no tissue is vaporised.
4. The surgeon separates the lenticule and removes it through the small incision. Most people feel pressure rather than pain.
5. Both eyes usually take 10–15 minutes in total.

Most people describe mild grittiness and watering for a few hours afterwards. Vision is usually functional the next day and continues to sharpen over the following days.

What Is SMILE Pro Surgery?

SMILE Pro is the SMILE procedure performed on Zeiss's newer VisuMax 800 laser. The operation itself is the same — a lenticule is created inside the cornea and removed through a small incision, with no flap — but the laser is much faster and the system adds aids for centring and aligning the treatment.

What changes with SMILE Pro:

• Faster laser time. The lenticule is created in a matter of seconds, so the eye needs to be held under suction for less time.
• Centration and alignment aids help the surgeon position the treatment accurately and account for slight eye rotation.
• Potentially more comfortable because of the shorter suction time.

What does not change:

• The same eligibility — mainly short-sightedness with or without astigmatism
• The same flapless benefits and the same recovery pattern
• The correction is still based on your prescription, not on a corneal map or ray-traced eye model

Visual results are expected to be similar to standard SMILE, and the platform's long-term track record is naturally shorter. If your centre offers both, ask what difference the newer laser makes in your case.

What Is SILK Laser Vision Correction?

SILK is a newer lenticule-extraction procedure from Johnson & Johnson, performed on its ELITA femtosecond laser. Like SMILE, it removes a thin lenticule from inside the cornea through a small incision, without a flap. The name stands for Smooth Incision Lenticular Keratomileusis.

The manufacturer positions SILK as producing a smooth, biconvex lenticule with the aim of quick visual recovery. Because it is newer, there is much less published long-term data on SILK than on SMILE, and it is not available at every centre in India.

If SILK is offered to you, it is reasonable to ask:

• How many SILK procedures the surgeon has performed
• What results the centre has seen so far for prescriptions like yours
• Why they recommend it over SMILE, LASIK or PRK for your eyes
• How an enhancement would be handled if one were needed

We describe SILK cautiously because evidence is still building; that is not a criticism of the technology, simply an honest reflection of how new it is.

SILK vs SMILE: What Is the Difference?

SILK and SMILE are both flapless lenticule-extraction procedures, so they work on the same principle; the differences are in the laser platform, the lenticule design and the amount of evidence behind each.

• Manufacturer and laser: SMILE (and SMILE Pro) uses Zeiss VisuMax lasers; SILK uses Johnson & Johnson's ELITA laser.
• Lenticule design: SILK uses a biconvex lenticule that the manufacturer describes as giving smoother surfaces; SMILE uses Zeiss's own lenticule design.
• Track record: SMILE has been performed widely for over a decade with extensive published results; SILK is much newer.
• Availability: SMILE is offered at many Indian centres; SILK is available at fewer.

In practice, for most patients the surgeon's experience with a particular platform matters more than the brand. Other lenticule-extraction systems also exist from other laser manufacturers, and the same principle applies: choose the surgeon and the evidence, not the name.

SMILE vs Customised LASIK (Contoura and InnovEyes)

The biggest difference between SMILE and customised LASIK is what the treatment is planned from. SMILE corrects your prescription — sphere and astigmatism. Contoura and InnovEyes can also address individual corneal or optical irregularities, because their plans come from a detailed corneal map or a full eye model.

This means:

• For regular eyes with a straightforward minus prescription, SMILE and customised LASIK usually give similar everyday vision. The decision then rests on flap versus no flap, recovery speed, lifestyle and cost.
• For eyes with small corneal irregularities or significant higher-order aberrations, a topography-guided or ray-tracing LASIK plan — or topography-guided surface treatment if a flap is unsuitable — may correct things SMILE cannot.
• For thin corneas, contact sports or borderline-dry eyes, SMILE's flapless design may outweigh the customisation advantage.

Your pre-operative scans usually make one direction clearer than the other.