Over the past few decades, vision correction procedures have revolutionised the eye care industry, making significant strides in improving patients’ visual acuity and overall ocular health. These options range from minimally invasive laser surgeries such as LASIK and PRK, to more invasive procedures such as implantation of intraocular lenses. Understanding the details of these procedures, their benefits, risks, and eligibility criteria is crucial when considering vision correction.
LASIK (Laser-Assisted In Situ Keratomileusis)
LASIK surgery has become the most common refractive surgery procedure, promising to correct common vision problems like myopia, hyperopia, and astigmatism. It involves creating a thin flap in the cornea using a microkeratome or a femtosecond laser, reshaping the underlying corneal tissue with an excimer laser, and then repositioning the flap.
- Benefits: The most significant advantage of LASIK is its speed of recovery, with most patients reporting improved vision within 24 hours. The procedure is relatively painless, and most patients require no corrective eyewear post-surgery.
- Risks: While rare, potential risks include dry eyes, glare, halos, double vision, and in extreme cases, loss of vision.
- Eligibility Criteria: Candidates should be over 18, have stable vision for at least a year, and have a suitable corneal thickness. Those with autoimmune diseases, a history of keloids, or pregnant women may be deemed unsuitable.
PRK (Photorefractive Keratectomy)
PRK is another form of refractive surgery similar to LASIK. The main difference is that instead of creating a corneal flap, the thin outer layer of the cornea (epithelium) is removed entirely and allowed to regenerate over time.
- Benefits: PRK is often recommended for individuals with thin corneas, where a LASIK procedure might not be suitable. It also eliminates the risk of flap-related complications.
- Risks: PRK recovery is generally slower and potentially more uncomfortable than LASIK, with complete vision recovery taking several weeks. There is also a slight risk of infection, corneal haze, and vision disturbances.
- Eligibility Criteria: PRK is suitable for those with stable vision, a refractive error within certain limits, and a sufficient corneal thickness. Like LASIK, those with autoimmune diseases or pregnant women may not be ideal candidates.
Intraocular Lenses (IOLs)
Intraocular lens implantation involves replacing the natural lens of the eye with an artificial one, usually to treat cataracts or severe refractive errors. There are several types of IOLs, including monofocal, multifocal, and accommodative lenses.
- Benefits: IOLs can provide a permanent solution for cataracts and can also correct refractive errors. Depending on the type of lens used, patients may not require glasses for certain distances.
- Risks: Potential risks include infection, inflammation, lens dislocation, retinal detachment, and decreased visual acuity.
- Eligibility Criteria: IOLs are primarily used in patients with cataracts. However, they can also be considered in people with severe myopia or hyperopia that can’t be corrected with other methods.
SMILE (Small Incision Lenticule Extraction)
SMILE is a newer, minimally invasive procedure that uses a femtosecond laser to create a small, lens-shaped bit of tissue (lenticule) within the cornea which is then removed through a small incision, altering the shape of the cornea and thus correcting vision.
- Benefits: SMILE is a flapless procedure, reducing the chance of complications associated with flap creation. It also results in fewer dry-eye symptoms than LASIK and PRK.
- Risks: Though rare, complications can include under correction, overcorrection, infection, and visual disturbances such as halos or starbursts.
- Eligibility Criteria: SMILE is generally used for the correction of myopia and astigmatism. Candidates should have stable vision, and should not be pregnant, breastfeeding, or have a collagen vascular, autoimmune, or immunodeficiency disease.
While all these procedures aim to improve vision, choosing the best one is a personalized decision. Factors such as the specific refractive error, age, lifestyle, overall health, and individual expectations from the surgery play a critical role. It’s crucial to have a detailed discussion with your ophthalmologist who can guide you to the most suitable vision correction option, ensuring optimal results.