SMILE (Small Incision Lenticule Extraction) differs from LASIK in that SMILE:
- A Creates a larger corneal flap with a microkeratome for better optical zone size
- B Uses a femtosecond laser to create and extract a stromal lenticule without creating a corneal flap, preserving more anterior stromal nerve fibers ✓
- C Requires an excimer laser for ablation and is suitable for hyperopic corrections only
- D Involves photorefractive keratectomy of the anterior stroma without removing Bowman's membrane
Correct answer: B. Uses a femtosecond laser to create and extract a stromal lenticule without creating a corneal flap, preserving more anterior stromal nerve fibers
Explanation
SMILE is a flapless procedure that uses a femtosecond laser alone to create an intrastromal lenticule, which is then removed through a small 2–4 mm incision. Since no flap is raised, more anterior stromal collagen and corneal nerves are preserved, resulting in greater biomechanical stability and less dry eye compared to LASIK. LASIK requires flap creation (microkeratome or femtosecond laser) followed by excimer laser ablation. SMILE is used for myopia and myopic astigmatism correction.
Reference: Khurana Comprehensive Ophthalmology, 7th ed.
High-yield for: NEET PGINI-CETNExTFMGEUSMLEPLABMRCP
Written and medically reviewed by the StethoPrep medical team.