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What Is Thin Cornea? Causes, Symptoms, and Eye Care Tips

A thin cornea refers to a condition where the cornea—the clear, dome-shaped front layer of the eye—has a thickness lower than normal, which can affect vision and overall eye health. This condition may result from various causes such as natural aging, frequent eye rubbing, genetic disorders, or side effects from eye surgeries like LASIK. Common symptoms include blurry vision, frequent changes in prescription, distorted images, and unusually high astigmatism.   Understanding the Cornea The cornea is the transparent, curved layer covering the front part of the eye. It helps focus light into the eye for clear vision and serves as a protective barrier against dust and germs. Normally, corneal thickness ranges between 520–550 microns, but it may thin with age.   What Is a Thin Cornea? A thin cornea is typically defined as a corneal thickness of less than 500 microns (0.5 mm). It is not necessarily a disease and often requires no treatment. However, thin corneas can affect certain diagnoses—such as glaucoma—since intraocular pressure readings may appear lower than actual values. Corneal thickness also plays an important role in refractive surgery decisions. For example, patients with thin corneas and high refractive errors (nearsightedness or astigmatism) may not be ideal candidates for LASIK, as the remaining corneal tissue after surgery might be too thin. This could increase the risk of complications like keratoconus or corneal ectasia. In such cases, ophthalmologists may recommend alternative procedures such as PRK, ICL, FemtoLASIK, ReLEx SMILE Pro, or NanoLASIK, which preserve more corneal tissue. Therefore, detailed corneal thickness assessment is essential before undergoing LASIK to ensure safe and effective outcomes.   Does Wearing Contact Lenses Cause Thinning of the Cornea? Generally, wearing contact lenses correctly does not thin the cornea. However, prolonged use without proper cleaning or rest may lead to oxygen deprivation or corneal infections, which can gradually weaken or thin corneal tissue.   Causes of Thin Cornea There are several factors that can lead to corneal thinning: 1. Genetic Conditions Keratoconus: The most common cause, where the cornea gradually thins and bulges outward into a cone shape, leading to irregular astigmatism and blurred vision. It usually appears during the teenage years to early adulthood. Corneal Dystrophies: Such as Pellucid Marginal Degeneration (PMD), where thinning occurs in the lower peripheral cornea. 2. Eye Surgery or Injury Procedures like LASIK or PRK can thin the cornea, especially if excessive corneal tissue is removed. Repeated eye injuries or untreated infections (e.g., corneal ulcers, keratitis) can also cause thinning due to tissue damage. 3. Systemic Diseases and Medication Autoimmune diseases such as Rheumatoid Arthritis or SLE can cause chronic inflammation, leading to corneal thinning.Long-term use of steroid eye drops may also weaken corneal tissue over time.   Symptoms of Thin Cornea Corneal thinning often progresses slowly and may not show early signs. Key symptoms include: Blurry or distorted vision Frequent changes in prescription High or irregular astigmatism Difficulty focusing or double vision   Diagnosis Thin cornea is often detected during pre-LASIK evaluations.Eye doctors use devices like: Keratometer: Measures corneal curvature and astigmatism. Corneal Topography: Creates a detailed map of corneal thickness and shape. Tomographic Biomechanical Index (TBI): Evaluates corneal strength and risk of ectasia. While early symptoms can hint at the condition, only a comprehensive eye exam by an ophthalmologist can confirm it.   Summary Thin cornea is a silent condition that can significantly impact vision if left untreated. Early detection—especially before refractive surgery—is crucial.At Bangkok Eye Hospital, advanced diagnostic tools and experienced specialists ensure accurate corneal thickness evaluation and personalized treatment planning to maintain long-term eye health.     FAQ: Frequently Asked Questions About Thin Cornea 1. Can corneal thickness be increased?No, corneal thickness cannot naturally increase as it is determined by the cornea’s internal structure. 2. What happens if thin cornea is left untreated?It may lead to worsening blurred vision, irregular astigmatism, or even corneal ectasia. In severe cases, acute hydrops or corneal perforation may occur, leading to permanent vision loss if untreated. 3. Can thin cornea be prevented?Yes — by avoiding vigorous eye rubbing, maintaining good eye hygiene, limiting contact lens wear time, and having regular eye checkups, especially if there is a family history of corneal diseases.
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Laser Vision LASIK Center

Post-LASIK Eye Care: Guidelines for Quick Recovery

Post-LASIK Eye Care: Guidelines for Quick Recovery After undergoing successful LASIK surgery, it's essential to follow specific guidelines for post-operative care to ensure a speedy recovery and minimize the risk of complications. Laser Vision recommends adhering to the following post-LASIK guidelines provided by your eye specialist.   Guidelines for the First Night After LASIK Surgery Use Eye Shields: Following your LASIK procedure, you'll receive eye shields to protect your eyes. These shields feature small openings for visibility, and it's crucial not to remove them. Avoid Eye Strain: Engage in activities that don't strain your eyes, and be cautious not to expose your eyes to water. When cleaning your face, opt for a damp cloth rather than splashing water directly on your eyes. You can continue with your regular shower and teeth-brushing routine. Use Artificial Tears: Post-surgery, most patients experience tearing and a gritty sensation in their eyes. To alleviate this, use preservative-free artificial tears. If your eye shields are not fitting securely, consider using micro-pore tape to keep them in place. Rest and Avoid Eye Rubbing: It's crucial to get plenty of rest and refrain from rubbing your eyes, especially during sleep. Even at night, do not remove the eye shields.   Guidelines for the First Week After LASIK Surgery Within a day, you should notice a reduction in discomfort and tearing, along with improved vision. Here are key post-LASIK guidelines for the first week:   Continue Medications: Follow your doctor's instructions regarding antibiotics and artificial tears. Maintain Eye Shield Usage: Keep wearing your eye shields while sleeping to prevent inadvertent eye rubbing. Avoid Eye Makeup: Steer clear of eye makeup, especially around the eyes, and ensure that no water or dust particles enter your eyes. Use Sunglasses: When exposed to bright light, wear sunglasses to reduce eye discomfort and sensitivity. Face and Hair Care: Do not wash your hair or face by yourself; visit a salon for hair washing, and use a damp cloth for face cleaning. Avoid Swimming: Refrain from swimming for the first two weeks and any underwater activities during the initial month post-LASIK. Contact the Clinic: If you experience significant changes in vision or severe discomfort, contact the clinic promptly.   In most cases, your doctor will schedule follow-up appointments, including evaluations of your visual acuity and discussions about any potential side effects or complications. Laser Vision boasts over 25 years of LASIK expertise, providing quality care and cutting-edge technology. For appointments and online LASIK consultations, call 02-511-2111 or 02-939-6006.
Laser Vision LASIK Center

How to Care for Your Eyes After LASIK Surgery

How to Care for Your Eyes After LASIK Surgery After undergoing LASIK surgery, proper eye care is essential to ensure a quick recovery. With the use of cutting-edge technology like NanoRelex and NanoLASIK from Switzerland, which employ low-energy lasers, post-LASIK side effects have been significantly minimized. Laser Vision, has been providing over 25 years of experience in LASIK procedures, guarantees a precise and safe process to promote clear and healthy eyes.   Dealing with Initial Post-LASIK Temporary Side Effects: After LASIK, patients may encounter short-term side effects that vary among individuals. Common early side effects including: Eye Irritation: Often occurring within the initial 24 hours after LASIK, this can be mitigated by getting sufficient rest and using cold compresses or prescribed eye drops. Blurry Vision: Typically experienced during the first week, this is attributed to dry eyes resulting from the LASIK procedure. Vision gradually improves as the cornea heals. Nighttime Glare: This may present as starbursts or halos but is usually temporary, diminishing as the cornea smooths over time. If night driving is affected, it's advisable to avoid it temporarily. Dry Eyes: LASIK can temporarily reduce tear production, leading to dry eyes. The discomfort can be relieved with artificial tears, and it usually improves with time.   Addressing Other Concerns: Should you encounter any of the following issues, it is crucial to seek immediate specialist assistance: Eye Pain or Severe Irritation Increased Swelling or Redness of the Eyes Beyond the First Day Sudden Vision Loss or Abnormal Eye Discharge Any Eye Injury Following LASIK Surgery   Conclusion: Your vision is a valuable asset, and after LASIK, it demands careful care and attention. Opting for a reputable LASIK center such as Laser Vision, known for advanced technology, standardized procedures, and extensive experience, all of which is vital to ensure a full and successful recovery.  
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