Refractive errors, including myopia, hyperopia, and astigmatism, are common causes of blurred vision. Advances in refractive surgery have made it possible to reduce or eliminate dependence on spectacles and contact lenses. Laser-Assisted in Situ Keratomileusis (LASIK) and Implantable Collamer Lens (ICL) implantation are two widely used surgical options for correcting refractive errors. Although both procedures aim to improve visual acuity and quality of life, they differ in their surgical techniques, indications, advantages, and potential complications.
LASIK: Procedure, Advantages, and Limitations
LASIK is a corneal refractive procedure that uses an excimer laser to reshape the corneal stroma and correct refractive errors. A thin corneal flap is created, followed by laser ablation of the underlying tissue. The flap is then repositioned, allowing rapid visual recovery.
The major advantages of LASIK include rapid visual rehabilitation, minimal postoperative discomfort, high patient satisfaction, and reduced dependence on spectacles. It is commonly used for suitable patients with stable refractive errors and adequate corneal thickness.
However, LASIK has certain limitations. It may cause dry eye symptoms, glare, halos, and reduced night-vision quality. Excessive removal of corneal tissue can increase the risk of corneal ectasia, particularly in patients with thin corneas or abnormal corneal topography. Therefore, careful preoperative assessment is essential to determine eligibility and minimize complications.
ICL: Procedure, Advantages, and Limitations
Implantable Collamer Lens implantation involves placing a biocompatible lens inside the eye, typically behind the iris and in front of the natural crystalline lens. Unlike LASIK, ICL does not require tissue removal from the cornea and is particularly useful for patients with moderate to high myopia, thin corneas, or those unsuitable for corneal laser surgery.
ICL offers excellent visual outcomes, preserves corneal integrity, and is associated with a lower incidence of postoperative dry eye compared with LASIK in many patients. The procedure is also potentially reversible because the implanted lens can be removed or exchanged when clinically indicated.
Nevertheless, ICL is an intraocular procedure and carries risks such as increased intraocular pressure, cataract formation, endothelial cell loss, inflammation, and infection. Appropriate lens sizing, assessment of anterior chamber depth, and long-term postoperative monitoring are essential for achieving safe outcomes.