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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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Understanding Age-Related Eye Health Issues and Care

Understanding Age-Related Eye Health Issues and Care As we age, it's natural to prioritize physical health, working diligently to prevent diseases such as diabetes, heart conditions, and high blood pressure. However, one aspect that often gets less attention is our eye health. Surprisingly, a survey by The International Agency for the Prevention of Blindness (IAPB) revealed that a significant 80% of individuals over the age of 50 experience various eye problems, with some facing the daunting prospect of blindness.   Age-Related Eye Problems   1. Presbyopia: The Age-Related Vision Challenge This age-related vision issue, known as presbyopia, typically emerges in one's early 40s or later. It's akin to looking through a foggy window, causing a decline in sharpness, particularly noticeable when driving at night.   2. Glaucoma: The Silent Thief of Sight Glaucoma, characterized by elevated eye pressure, stiffens the eye, affecting peripheral vision while retaining central vision. There are two main types: closed-angle and open-angle glaucoma. Closed-angle glaucoma is more prevalent in elderly women, causing sudden eye pain and blurred vision, necessitating immediate attention. In contrast, chronic open-angle glaucoma is often asymptomatic, making regular eye exams crucial for early detection.   3. Age-Related Macular Degeneration (AMD): A Leading Cause of Vision Loss Age-Related Macular Degeneration (AMD) is a significant contributor to vision loss in the elderly. It starts with clear peripheral vision but blurry central vision due to macular tissue abnormalities. It often has a hereditary component and is associated with risk factors such as high blood pressure, high cholesterol, obesity, and smoking.   Other Eye Health Concerns   4. Floaters: Understanding Those Pesky Spots Floaters, those small dark spots or streaks in your vision, can resemble flying insects. These result from changes in the vitreous substance inside the eye. While they're usually harmless, an excessive amount, accompanied by decreased vision, should prompt a visit to an ophthalmologist.   5. Cataracts: The Clouding of Vision Cataracts, the clouding of the eye's lens leads to reduced vision. Cataracts are common among the elderly and can be related to aging, diabetes, high blood pressure, and smoking. Surgical removal is often necessary when they significantly impair vision.   Regular Eye Health Check-ups Just like overall physical health, it's vital to schedule regular eye check-ups, at least annually, with a specialist.   Conclusion: Optimizing Eye Health in Your Golden Years In your pursuit of a healthy and fulfilling life as you age, don't overlook the significance of eye health. By understanding common age-related eye issues and the importance of regular check-ups, you can safeguard your vision and enjoy a vibrant, active lifestyle well into your golden years.        
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Understanding Visual Acuity Measurement and 20/20 Vision

Understanding Visual Acuity Measurement and 20/20 Vision The Principle of Visual Acuity Testing: The fundamental principle behind measuring visual acuity lies in the size of the image projected onto the retina. This size depends on both the size of the object being viewed and the distance from the eye. To assess visual acuity, eye care professionals commonly employ Snellen charts, which consist of numbers and letters of varying sizes. Importance of Visual Acuity Measurement: Visual acuity measurement is vital in assessing the clarity of vision. It helps determine an individual's ability to read and recognize objects at specific distances. This information is crucial for identifying vision problems and prescribing corrective measures such as eyeglasses or contact lenses. Near Vision Testing with Reduced Snellen Charts: In addition to standard Snellen charts, near vision testing is essential, especially for individuals experiencing presbyopia, a condition that affects near vision as we age. Near cards, or reduced Snellen charts, are used to evaluate close-up vision. Test subjects hold the cards at a distance of 14 inches and read the numbers or letters. This helps diagnose and address near vision issues. Decoding 20/20 Vision: The term "20/20 vision" is often heard, but what does it mean? The first "20" represents the distance at which the individual is tested, typically 20 feet. The second "20" signifies the level of visual acuity. A person with 20/20 vision can see the same size letters or numbers at 20 feet as a person with normal vision. The higher the second number, the poorer the visual acuity. For example, 20/40 vision means the person can see at 20 feet what a person with normal vision can see at 40 feet. Conclusion: Visual acuity measurement is a fundamental aspect of eye health evaluation. Understanding the principles of visual acuity testing and the significance of 20/20 vision aids in identifying vision issues early and seeking appropriate solutions.  
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