SMILE Eye Surgery

SMILE eye surgery offers a combination of advanced technology and patient-centric outcomes, making it one of the most sought-after vision correction options today. The SMILE procedure is designed to deliver excellent visual results while minimising disruption to the eye's natural structure.

Key benefits of SMILE surgery include:

• Minimally invasive approach: No corneal flap, only a small incision
• Faster recovery time: Most patients return to routine activities within 24–48 hours
• Lower risk of dry eyes: Better preservation of corneal nerves compared to LASIK
• High precision correction: Advanced laser technology ensures accurate and predictable outcomes
• Enhanced corneal stability: Maintains the biomechanical strength of the eye

While SMILE surgery is highly effective, candidacy depends on a detailed clinical evaluation to ensure optimal safety and outcomes. The SMILE procedure is best suited for individuals with specific refractive conditions and stable eye health.

You may be an ideal candidate for SMILE eye surgery if:

• You are 18 years or older with stable vision for at least one year
• You have myopia (nearsightedness) up to -10D and astigmatism up to 5D
• Your corneal thickness is sufficient to support the procedure
• You do not have severe dry eyes or active eye infections
• You are not affected by conditions like keratoconus or uncontrolled systemic diseases

A key clinical advantage of SMILE surgery is the preservation of anterior corneal lamellae due to the absence of a flap. Since the SMILE procedure involves only a 2–4 mm incision, nearly 80% of the corneal surface remains untouched.

This results in better biomechanical stability compared to flap-based procedures, lowering the theoretical risk of post-surgical ectasia in appropriately selected patients.

Quick Facts:

• Incision size: ~2–4 mm
• No flap creation → stronger corneal structure
• Better preservation of corneal biomechanics

Corneal nerves, primarily located in the anterior stroma, are less disrupted in SMILE laser eye surgery due to the small incision approach. In contrast, flap creation in LASIK severs a larger proportion of these nerves.

This anatomical preservation plays a crucial role in maintaining tear film stability and corneal sensitivity, leading to a lower incidence and shorter duration of post-operative dry eye symptoms in SMILE eye surgery patients.

Quick Facts:

• Minimal nerve disruption vs LASIK
• Faster recovery of corneal sensitivity
• Lower incidence of chronic dry eye
• Better tear film stability post-surgery

SMILE surgery delivers predictable and stable refractive outcomes, particularly for myopia. Clinical studies show high efficacy, with a majority of patients achieving 20/20 vision or better, depending on pre-operative parameters.

The lenticule-based correction in the SMILE procedure maintains corneal asphericity more naturally, which may contribute to better quality of vision, especially in low-light conditions.

Quick Facts:

• High predictability for myopic correction
• The majority achieve 20/20 or better vision
• Reduced induction of higher-order aberrations (case-dependent)
• Long-term refractive stability observed

SMILE and PRK are both flap-free procedures, but they differ significantly in how the cornea is treated and how recovery progresses.

In SMILE surgery, the correction is performed within the cornea by removing a lenticule. In PRK, the outer epithelial layer is removed, and the cornea is reshaped using an excimer laser.

1. Tissue Interaction:

• SMILE → Internal stromal correction
• PRK → Surface ablation after epithelial removal

2. Invasiveness:

• Both flap-free, but SMILE preserves the surface epithelium
• PRK involves surface healing

3. Recovery Time:

• SMILE → Faster visual recovery (1–2 days)
• PRK → Slower recovery (several days to weeks)

4. Comfort:

• SMILE → Minimal discomfort
• PRK → More post-operative discomfort during epithelial healing

5. Use Case:

• SMILE → Moderate to high myopia and astigmatism
• PRK → Thin corneas or specific contraindications for LASIK/SMILE

SMILE and ICL represent two fundamentally different approaches, corneal reshaping vs intraocular lens implantation.

In SMILE laser eye surgery, vision is corrected by reshaping the cornea. In contrast, ICL involves placing a biocompatible lens inside the eye, without altering corneal structure.

1. Procedure Type:

• SMILE → Laser-based corneal reshaping
• ICL → Implantable lens inside the eye

2. Invasiveness:

• SMILE → Minimally invasive (no intraocular entry)
• ICL → Intraocular procedure

3. Reversibility:

• SMILE → Permanent corneal change
• ICL → Reversible (lens can be removed)

4. Suitability:

• SMILE → Mild to high myopia
• ICL → Very high refractive errors or thin corneas

5. Visual Quality:

• Both provide excellent outcomes, but ICL may offer superior results in extreme prescriptions

Intermediate vision (such as computer use, dashboards, or tasks at arm's length) generally becomes more comfortable after SMILE eye surgery because it benefits from improved distance focus and overall optical alignment.

However, it is important to understand that SMILE is not specifically designed to optimise intermediate vision independently, but many patients find it adequate for routine daily activities.

What to expect:

• Clear vision for most day-to-day tasks
• Comfortable screen usage for routine durations
• May require ergonomic adjustments (lighting, screen distance)

SMILE surgery does not correct presbyopia, which is the age-related reduction in the eye's ability to focus on near objects. Therefore, near vision outcomes depend largely on the patient's age and natural accommodation.

Younger patients (typically below 40) often retain good near vision after surgery. However, individuals approaching or above presbyopic age may still require reading glasses for fine print or prolonged near work.

What to expect:

• Good near vision in younger individuals
• Possible need for reading glasses with age
• No worsening of natural near vision beyond expected ageing

Night vision after SMILE laser eye surgery is influenced by factors such as pupil size, optical zone design, and higher-order aberrations. Modern planning protocols aim to optimise visual quality under low-light conditions.

Some patients may notice temporary glare, halos, or light sensitivity during the early recovery phase. These effects typically reduce as the eye adapts and healing progresses.

What to expect:

• Progressive improvement in night clarity
• Temporary visual disturbances in the early days
• Stable and comfortable night vision over time