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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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Safe Songkran Celebration - Protecting Your Eyes from Infections

Safe Songkran Celebration - Protecting Your Eyes from Infections Eyes are vulnerable to various infections, particularly when exposed to impure water during the Songkran festival. Water used for the festivities may contain harmful bacteria, viruses, or even fungi. Before joining the water splashing fun, it's crucial to examine the water you'll be using for any contamination like dust, debris, sand, or impurities.   Eye Conditions Arising from Unclean Water and Contaminants Conjunctivitis (Pink Eye): Symptoms include redness, itching, eye discharge, excessive tearing, and inflammation of the white part of the eye. It can be caused by allergies or infections, including bacteria or viruses transmitted through contaminated water. Corneal Abrasions and Ulcers: The cornea, the clear front surface of the eye, can be scratched due to foreign objects or improper use of contact lenses. Severe cases can lead to corneal ulcers when infections occur. Stye: Styes are inflamed oil glands on the eyelid. When these glands get blocked, they can become painful and red. Red Eye: This condition includes symptoms like a red and swollen white of the eye, excessive eye discharge, itching, eye pain, sensitivity to light, and blurred vision. If you get water or foreign objects in your eye, rinse with clean water. Afterward, observe if the symptoms improve; if not, consult a doctor within 1-2 days.   Precautions for Songkran Celebration Before participating in the water festivities, ensure that the water is sufficiently clean and free from impurities. If something foreign enters your eye, do not rub it as this may dislodge your cornea. Rinse your eye with clean water and seek medical attention if necessary. If contaminated water causes eye irritation, such as redness, itching, or tearing, rinse your eyes with flowing clean water. For contact lens wearers, it's not recommended to wear lenses while participating in water activities to prevent infections. After the Songkran celebration, check for any signs of eye discomfort or redness. If you experience eye irritation that doesn't improve, consult an eye doctor.   In Summary While celebrating Songkran, take steps to protect your eyes from infections caused by impure water and contaminants. By following these precautions, you can enjoy a safe and joyful Songkran festival without compromising your eye health.        
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Allergic Conjunctivitis: Understanding Inflammation Triggered by Allergies

Allergic Conjunctivitis: Understanding Inflammation Triggered by Allergies Allergic conjunctivitis can be a result of allergies or, in some instances, infections. The reason allergies often target the eyes is because they have a rich network of blood vessels that react to allergens. Your eyes are in direct contact with the external environment.   When you encounter allergens like pollen, dust, pet dander, medications, or cigarette smoke, these substances dissolve in your tears and interact with the conjunctiva. This conjunctiva generates antibodies known as IgE (Immunoglobulin E). When allergens bind to these antibodies, it sets off an allergic response. This leads to itching, redness, and watery eyes. Your skin around the eyes typically remains unaffected, and your vision remains clear. It's advisable to avoid wearing contact lenses during this time, as they could raise the risk of bacterial infections.   Types of allergic conjunctivitis:   Conjunctivitis: This is the most prevalent form of allergic conjunctivitis and is often accompanied by symptoms like a runny nose. Key indicators include itchy, watery eyes, usually affecting both eyes, and the severity may fluctuate with the seasons. Perennial Allergic Conjunctivitis: This type is a year-round allergic response and is less common. The symptoms are typically milder compared to the first type. Atopic Keratoconjunctivitis: This form is often linked with skin issues such as eczema around the eyes and face. Symptoms encompass redness, itching, and excessive tearing. The hallmark sign is intense eye itching. In the case of an infection, you might experience pain and a mucous or pus-like discharge. Inflammatory changes may affect the conjunctiva and cornea.   Preventing allergic conjunctivitis: To ward off allergic conjunctivitis, it's vital to minimize your exposure to allergens. This includes avoiding places with blooming flowers, dusty environments, cigarette smoke, and pets.   Self-care for allergic conjunctivitis: If you're experiencing eye irritation and suspect allergies, take immediate steps to avoid allergens. You can use artificial tears to reduce swelling and flush out allergens. Applying a cold compress can help diminish swelling. Over-the-counter antihistamines can offer relief. If self-care doesn't alleviate your symptoms, it's wise to seek advice from a healthcare professional who may prescribe allergy eye drops.   Avoiding allergens: In certain cases, rinsing your eyes with a saline solution might be necessary. Cold compresses can help reduce swelling. You may be prescribed eye drops to constrict blood vessels and reduce inflammation. In severe cases, steroid eye drops are employed.        
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