| Several factors increase the risk of complications following LASIK surgery. These include pre-existing dry eye disease, thin corneas, high myopia or hyperopia (significant nearsightedness or farsightedness), previous eye surgery or trauma, certain autoimmune diseases, and unrealistic expectations. Age, overall health, and diligent adherence to post-operative care instructions also play a role in determining the likelihood of a successful outcome and minimizing potential risks. 
LASIK, while generally safe and effective, carries certain risks. These risks can vary depending on individual factors and the surgeon's skill. They can be broadly categorized as:
Pre-existing Conditions & Factors Increasing Risk: - Thin corneas: This is a major contraindication for LASIK. Insufficient corneal thickness can lead to ectasia (thinning and bulging of the cornea), resulting in blurry vision and potentially needing corneal transplants.
- Dry eyes: Dry eye syndrome can be exacerbated by LASIK, leading to discomfort and potentially affecting visual acuity. Pre-existing dry eyes significantly increase the risk of post-operative complications.
- Certain medical conditions: Conditions like autoimmune diseases, diabetes, and some connective tissue disorders can increase the risk of complications.
- Pregnancy or breastfeeding: Hormonal changes during pregnancy and breastfeeding can affect corneal healing and are generally reasons to postpone LASIK.
- Age: While LASIK is possible for many older adults, the risk of complications might increase slightly with age due to slower healing.
- High myopia or hyperopia: Individuals with very high degrees of nearsightedness (myopia) or farsightedness (hyperopia) may have a higher risk of complications and less predictable outcomes.
- Previous eye surgery: Having had previous eye surgeries can complicate the LASIK procedure and increase risks.
- Unrealistic expectations: Patients with unrealistic expectations about the outcome may be more prone to disappointment, even with a successful procedure.
Procedure-Related Risks: - Infection: Though rare, infection is a potential risk of any surgery, including LASIK.
- Dry eye syndrome: As mentioned above, LASIK can worsen existing dry eye or even cause it. Artificial tears and other treatments may be needed.
- Halos and glare: Some patients experience halos or glare around lights, especially at night, after LASIK. This often improves over time but may persist in some cases.
- Undercorrection or overcorrection: The LASIK procedure may not correct vision perfectly, resulting in the need for further correction (either glasses, contacts, or enhancement procedures).
- Regression: Vision may gradually regress after LASIK, requiring further correction.
- Corneal flap complications: Complications related to the creation and repositioning of the corneal flap (during flap-based LASIK) are possible, though rare with experienced surgeons. This can include flap displacement, incomplete flap creation, or irregular flap healing.
- Loss of best corrected visual acuity: In rare cases, LASIK can result in a worse visual outcome than before the surgery.
Important Note: The risks associated with LASIK are generally low, but it's crucial to discuss these potential complications with your ophthalmologist before undergoing the procedure. A thorough pre-operative evaluation is vital to determine if you are a suitable candidate and to minimize potential risks.
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