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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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Ultimate Eye-Nourishing Foods

Ultimate Eye-Nourishing Foods Your eyes require care and attention, just like any other part of your body. Consuming natural, beneficial foods can help maintain strong eye health and keep your vision fresh for years to come.   Apricots: Apricots are sweet and contain beta-carotene, which helps slow the degeneration of the eye lens. They nourish the eyes and help prevent cataracts.   Goji Berries: Rich in beta-carotene and zeaxanthin, goji berries enhance vision and can aid in treating night blindness. They also improve image reception and protect against harmful blue and violet light, ultimately slowing down the aging of the eyes.   Strawberries: Strawberries, being both sweet and sour, are rich in vitamin A, which ensures clear vision. They have more vitamin C than lemons, supporting a strong immune system and preventing various diseases.   Citrus Fruits: Citrus fruits like oranges, tomatoes, and bell peppers contain high levels of vitamin C. This vitamin can reduce the risk of cataracts and improve blood circulation in the eyes. Oranges, in particular, are beneficial for preventing colds and have a mild laxative effect.   Dark Leafy Greens: Dark leafy greens such as kale, spinach, and broccoli are rich in vitamin A and beta-carotene. They not only nourish the eyes but also contribute to cancer prevention and maintain a healthy immune system.   Red Beans: Red beans are an excellent source of zinc, which benefits the eyes. Regular consumption can reduce the risk of age-related macular degeneration (AMD), breast cancer, and heart disease.   Watercress: Watercress alleviates eye strain when used for extended periods. It also helps relieve dry eyes.   Pumpkin: Pumpkin supports clear vision, prevents dry eye conditions, and aids in the healing of eye injuries.   Tamarind Leaves: Tamarind leaves are rich in beta-carotene and carotenoids. They help nourish the eyes and can reduce the risk of night blindness.   Incorporating these eye-nourishing foods into your diet can significantly contribute to maintaining good eye health. Regular intake of these foods can protect against various eye conditions and ensure clear, vibrant vision for years to come.  
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Herbal Remedies for Eye Health

Herbal Remedies for Eye Health If you are a senior or experiencing eye-related issues such as cataracts, blurry vision, eye irritation, or difficulty seeing at night, these three herbs may provide relief and promote better eye health.   Basil: Basil is commonly used in cooking and can alleviate eye discomfort. It contains various nutrients such as vitamin C, phosphorus, iron, and calcium. Additionally, it is rich in beta-carotene, which the body converts into vitamin A, supporting overall eye health.   Cassia: The flowers and tender leaves of cassia are used in various dishes, like iron-rich curries and soups. Cassia is packed with high levels of beta-carotene and is renowned for its mild laxative properties. Besides promoting eye health, it serves as a gentle detoxifier.   Carrots: Carrots can be consumed raw as a salad or incorporated into various dishes. They are exceptionally high in beta-carotene, making them extremely beneficial for eye health.   Incorporating these herbs into your diet can contribute to better eye health. However, if you have severe eye issues, it is essential to consult an eye specialist for a comprehensive evaluation and treatment.
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