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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

Farsightedness (Hyperopia)

What Is Farsightedness? Farsightedness, also known as hyperopia, is a common refractive error in which light entering the eye focuses behind the retina, rather than directly on it. This occurs because the eye is either too short from front to back, or the cornea has too little curvature. As a result, people with hyperopia have difficulty seeing objects up close, while distant objects may appear clearer. In some cases, especially in young individuals, the eye’s natural lens can compensate, making symptoms less noticeable—until eye strain sets in. Causes of Farsightedness Hyperopia is typically hereditary and present from birth. Its main cause is related to abnormalities in the shape of the eye: Shortened axial length: The eyeball is shorter than normal, causing light to focus behind the retina. Flat corneal curvature: The front surface of the eye (cornea) is less curved than usual. Age-related lens changes: The natural ability to accommodate diminishes over time, revealing or worsening farsightedness. While it often develops early in life, farsightedness can progress or become more noticeable with age, especially after age 40 due to presbyopia—an age-related decline in near vision. Symptoms of Farsightedness The symptoms vary based on the degree of hyperopia and a person’s age. Mild cases may be asymptomatic, while more severe hyperopia can significantly affect daily activities. Common signs include: Difficulty focusing on near objects (e.g., reading, using a smartphone) Eyestrain or fatigue, especially during tasks requiring close vision Headaches, particularly after prolonged reading or screen use Squinting to see nearby items clearly Burning or aching eyes In children, crossed eyes (strabismus) may develop if uncorrected Diagnosing Hyperopia at Bangkok Eye Hospital Accurate diagnosis is key to determining the appropriate treatment. At Bangkok Eye Hospital, our eye specialists use a range of technologies to assess your vision, including: Refraction testing using autorefractors or phoropters Visual acuity testing for both distance and near vision Cycloplegic refraction for children or those suspected of accommodating excessively Retinoscopy and manual lens comparison Our experienced ophthalmologists ensure that your prescription is tailored not only to your refractive error but also to your lifestyle and visual demands. Treatment Options for Farsightedness There are several effective ways to correct hyperopia, depending on the severity, age, and preference of the patient: Eyeglasses Most common and non-invasive solution Use convex lenses to help light focus correctly on the retina Suitable for all age groups Available in single-vision or multifocal (progressive) options Contact Lenses Provide a wider field of view compared to glasses Soft lenses, rigid gas-permeable (RGP) lenses, or multifocal contacts Require proper hygiene and fitting by a specialist Refractive Surgery (LASIK/PRK) Reshapes the cornea to correct how light is focused Suitable for mild to moderate hyperopia Fast recovery and long-term solution for many patients Related reading: What Is LASIK Eye Surgery? Refractive Lens Exchange (RLE) Recommended for older patients or those with significant presbyopia Involves replacing the natural lens with a custom intraocular lens (IOL) Similar to cataract surgery but done electively for vision correction Can Farsightedness Be Prevented? Since hyperopia is often genetic and structural, it cannot be prevented. However, early diagnosis and appropriate correction can prevent complications such as: Eyestrain and chronic headaches Learning difficulties in children Amblyopia (lazy eye) Strabismus (crossed eyes) Regular eye exams are especially important for children, who may not realize they are having difficulty seeing clearly. Related Services at Bangkok Eye Hospital To provide comprehensive care for hyperopia, Bangkok Eye Hospital offers: Comprehensive Eye ExaminationsFor accurate diagnosis and personalized prescriptions Refractive Surgery CenterIncludes LASIK, PRK, and advanced imaging for treatment planning Pediatric Eye Care ClinicFor early detection and treatment of vision problems in children Contact Lens ClinicOffers expert fittings for patients with hyperopia and presbyopia Presbyopia and Aging Eye CenterFor adults over 40 needing correction for both near and distance vision Frequently Asked Questions (FAQs) Is farsightedness the same as presbyopia?No. Hyperopia is due to an eye shape issue, often present from birth. Presbyopia is age-related and affects the eye’s focusing ability, usually after age 40. Can children outgrow farsightedness?Yes, in some cases. As a child’s eye grows, mild hyperopia may correct itself. Regular eye exams are important to monitor changes. Is LASIK effective for farsightedness?Yes. LASIK can correct mild to moderate hyperopia by reshaping the cornea to improve light focus. Do I need to wear glasses all the time if I have hyperopia?Not necessarily. If your farsightedness is mild and your eyes can compensate, you might only need glasses for reading or computer use.   Can uncorrected hyperopia cause eye problems?Yes. It can lead to eye strain, headaches, blurred vision, and in children, may increase the risk of amblyopia or crossed eyes.
Laser Vision LASIK Center

Choosing the Right LASIK Treatment

Choosing the Right LASIK Treatment When it comes to LASIK eye surgery, many individuals have questions like, "Which LASIK Treatment is best?" and "Can I choose my LASIK treatment, or does the doctor decide?" Laser Vision is here to provide you with answers and insights into LASIK treatment, helping you make an informed decision. PRK (Photorefractive Keratectomy): PRK is a well-established treatment technique for vision correction. It involves removing the outermost layer of the cornea and using an Excimer Laser to reshape it. PRK is suitable for mild to moderate vision issues like nearsightedness, farsightedness, and mild astigmatism. LASIK (Laser In Situ Keratomileusis): LASIK is a popular and advanced vision correction treatment. It includes creating a corneal flap using a blade and reshaping the cornea with an Excimer Laser. LASIK is suitable for various vision issues, such as nearsightedness, farsightedness, and astigmatism. NanoLASIK: NanoLASIK is a modern and bladeless approach to vision correction. It uses laser light for precise corneal reshaping. This treatment enhances the chances of treating higher-level vision issues and reduces discomfort. NanoRelex: NanoRelex is the most advanced vision correction treatment. It uses a Femtosecond Laser for precise corneal tissue reshaping, making it a gentle option for mild to moderate nearsightedness and mild astigmatism. Your eyes are unique, and the best LASIK treatment depends on your specific needs. In addition to your eye condition and the available treatment techniques, your daily lifestyle plays a vital role in the decision-making process. Ultimately, the choice of LASIK treatment should be a collaborative decision between you and your doctor, aiming for the best possible vision correction. Conclusion: At Laser Vision, our team of experienced eye specialists is dedicated to long-term vision correction. We offer a range of LASIK treatment technologies, including PRK, TransPRK, LASIK, FemtoLASIK, NanoLASIK, and NanoRelex, tailored to your individual needs. Trust us to guide you toward the best LASIK treatment for your unique vision requirements.  
Laser Vision LASIK Center

NanoRelex: The Latest Breakthrough in LASIK Technology with AI Precision"

NanoRelex: The Latest Breakthrough in LASIK Technology with AI Precision" Are you considering vision correction options for yourself or a loved one? Don't miss out on NanoRelex, the cutting-edge LASIK technology hailing from Switzerland, now enhanced with Artificial Intelligence (AI) for exceptional results.   What Is NanoRelex?   Let's begin by exploring the realm of LASIK procedures. LASIK, short for Laser In-Situ Keratomileusis, is a proven vision correction technique that employs laser technology to restore clear vision for individuals with nearsightedness, farsightedness, or astigmatism. With over two decades of history, LASIK has evolved, yet the traditional approach involves a microkeratome blade for corneal flap creation, followed by corneal reshaping using a laser. Post-surgery, it's common to visualize patients wearing eye shields for several days.   FemtoLASIK is a more advanced option that replaces the blade with a femtosecond laser to create the corneal flap and excimer laser reshaping, delivering precise results and rapid recovery. Patients can bid farewell to eye shields in as little as one night. Another option, ReLEx SMILE, builds upon FemtoLASIK by employing Femtosecond Laser technology to create 3D lenticules within the cornea. These lenticules are extracted through small incisions (2-4mm) without the use of an Excimer Laser, significantly reducing recovery time.   The Next Frontier: NanoRelex The term "the latest" is about to take on a new meaning as Laser Vision introduces the most recent Swiss innovation: NanoRelex. This technology leverages the power of Artificial Intelligence, utilizing minimal nanojoules of energy for the procedure. Patients experience minimal discomfort during surgery, and an advanced eye-tracking system ensures unparalleled precision. With super small corneal layer opening and closing processes, the surgery time is significantly reduced. Furthermore, post-surgery discomfort is minimal, and the small corneal incision (2-3mm) heals within 24 hours. It's a game-changer, offering not only superior results but also time-saving benefits.        
Laser Vision LASIK Center

NanoLASIK: Revolutionizing Vision Correction for Swift Recovery

NanoLASIK: Revolutionizing Vision Correction for Swift Recovery If you're grappling with vision problems and have opted for LASIK, NanoLASIK, the latest Swiss innovation, could be the game-changer you're seeking. With nanotechnology at its core, NanoLASIK promises a quick recovery, ensuring you swiftly regain clear vision. When it comes to vision issues, eyeglasses and contact lenses are common remedies. However, they can be inconvenient, leading to situations like misplacing your glasses or experiencing discomfort with contacts. This is where LASIK, a vision correction procedure, shines as a long-term solution for significantly improving your eyesight.   Understanding LASIK:   LASIK, short for Laser In-Situ Keratomileusis, is a medical marvel using laser technology to correct various vision problems, including myopia, hyperopia, and astigmatism. It's known for its convenience, safety, and rapid results. LASIK comes in different variants, but generally, LASIK refers to a method that involves creating a corneal flap with a microkeratome blade and then using an excimer laser for precise corneal reshaping. The flap is repositioned afterward.    Decoding FemtoLASIK:   FemtoLASIK, or Femto for short, is an advanced vision correction technique that replaces the microkeratome blade with femtosecond laser technology for corneal flap creation. Subsequent steps involve employing an excimer laser for corneal reshaping, offering superior precision throughout the process and usually requiring a short recovery period of 2-3 days.   Introducing NanoLASIK:   NanoLASIK is the latest milestone in vision correction, building upon the advancements of FemtoLASIK. NanoLASIK utilizes low-energy nanosecond lasers with nanometer-level precision, augmented by artificial intelligence (AI) systems to prevent corneal movement. This groundbreaking approach eliminates the need for excessive corneal tissue removal, making it ideal for individuals with higher degrees of myopia. What's more, NanoLASIK prioritizes patient comfort and recovery, with most individuals experiencing a rapid, one-day recovery. This cutting-edge technology offers a renewed and clearer world, granting individuals the freedom to resume their regular activities, all under the care of experienced medical professionals.
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