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.

Dry eyes Tears play a crucial role in keeping our eyes moist, ensuring clear vision by letting light effectively pass through the eye's lens, and supplying oxygen to nourish the eye. They also help fend off infections and keep foreign substances at bay.   Now, when it comes to dry eyes, it's a pretty common issue that can stem from abnormal tear production or tears evaporating too quickly. This can lead to discomfort, irritation, that feeling like there's something foreign in your eye, redness, pain, blurry vision that gets better with blinking, or even feeling like your eyes are tired and heavy. What causes dry eyes can vary—getting older, being a woman (yeah, we're more prone to it), certain allergy medications, spending loads of time on screens, being in places with dust and smoke, gusty winds, and bright lights, they can all have a hand in it.   But hey, the good news is there are ways to tackle dry eyes:   Keep away from things that can make it worse, like strong winds and dust, by popping on some sunglasses and protecting those peepers. Remember to take breaks or blink more often, especially when you're glued to screens for a while. You've got these cool eye drops called artificial tears. There's a type for daytime (more watery) and nighttime (a bit thicker). Which one to use depends on how serious your dry eye situation is. Sometimes your doc might suggest special eye drops that encourage your eyes to make more tears. Give your eyes a treat with warm, clean cloths over your closed eyelids to help them feel better. If the dry eye struggle is real and isn't improving, it's wise to chat with an eye doctor.   All in all, dry eyes can be a bother, but there are solutions out there. It's important to take good care of your eyes, especially when it's all dry outside. If you suspect you've got dry eyes, having a chat with an eye care expert is a smart move.      

People with myopia have blurred distance vision, while near vision usually remains clear. At myopia 100, distance vision begins to blur, while higher levels such as 300, 400, 500, and up to 800 cause increasing blur at most distances. Myopia can be corrected with glasses or contact lenses, and permanently treated with LASIK or implantable lenses after consultation with an ophthalmologist. Understanding how people with myopia levels 50, 100, 300, 400, 500, and 800 see without glasses highlights the importance of proper eye care. This article presents simulated images of visual blur at different myopia levels to show how vision changes and how it affects daily life.   Visual Characteristics of People With Myopia If you have myopia, your vision typically appears as follows. The severity of blur varies depending on the degree of myopia. Blurred distance vision: Distant objects such as road signs, classroom boards, or television text appear blurry and lack sharp detail. Clear near vision: Reading, using a smartphone, or working on a computer at close range remains relatively clear. Squinting to see clearly: You may instinctively squint to narrow incoming light, temporarily improving focus on distant objects. Light glare or halos: Some individuals notice scattered lights or glare at night, especially from streetlights or headlights.   Myopia Levels Explained: Vision at Each Degree Myopia is classified by severity, and each level affects vision differently, as outlined below.   Vision With Myopia 25–50 Myopia levels between 25 and 50 are considered mild. Distance vision may appear slightly unclear, especially in low-light conditions. Many people notice little difference and may not require glasses in daily life, though eyewear may be recommended for tasks requiring high visual precision.   Vision With Myopia 75–100 At myopia levels 75 to 100, distance blur becomes more noticeable, particularly in dim lighting or when reading small text from afar. Wearing glasses improves clarity and safety, especially during activities such as night driving or watching television. Vision at myopia 100 is clearly blurrier than normal vision.   Vision With Myopia 150–200 Myopia levels between 150 and 200 cause significantly blurred distance vision, making glasses necessary both day and night. Eye fatigue may also occur more easily, even during near work. Consistent use of corrective lenses helps improve clarity and reduce eye strain.   Vision With Myopia 300 and Above High myopia, from 300, 400, 500 up to 800, results in severe distance blur and requires glasses at all times to ensure clear vision and reduce accident risk. Regular annual eye examinations are strongly recommended to monitor eye health and prevent complications under professional ophthalmic care.   Myopia Care and Treatment Options At myopia 100, visual blur may still be mild, but as myopia progresses to 300, 400, 500, or 800, vision becomes increasingly blurred. Proper management and treatment are essential to protect long-term eye health. Eyeglasses: The simplest and safest method for correcting myopia. Contact lenses: Suitable for those who prefer not to wear glasses, requiring strict hygiene and proper care. Refractive surgery: Procedures such as LASIK or other corrective surgeries reshape the cornea to improve visual clarity.   Summary Vision without glasses in people with myopia varies by severity—from mildly reduced clarity at myopia 100 to significant blur at levels above 300, which can greatly affect daily life. Regular eye examinations and consultation with an ophthalmologist are essential for proper diagnosis, prevention of complications, and appropriate vision correction. Bangkok Eye Hospital offers comprehensive eye care with advanced technology and experienced specialists to support long-term visual health.   Frequently Asked Questions About Myopia Vision (FAQ) Is myopia 100 considered severe? Myopia 100 is considered mild and not severe. Glasses may be recommended for certain activities to enhance clarity and safety.   Do I need glasses if I have myopia 100? In daily life, glasses may not always be necessary. However, wearing glasses during activities such as night driving or watching TV can improve vision and safety.   Does myopia 100 affect eye health? Generally, myopia at this level does not cause serious eye health issues. Regular eye checkups are still recommended to monitor vision and maintain proper eye care.

Blurred distance vision may be a sign of nearsightedness or farsightedness and should be evaluated by an ophthalmologist for accurate diagnosis and treatment. Ophthalmologists diagnose blurred distance vision through comprehensive eye exams, including refraction tests and overall eye health assessments, to determine the exact cause. Treatment options for blurred distance vision include prescription glasses, contact lenses, or LASIK surgery to restore clear vision. Blurred distance vision is a common issue that many people experience and may be caused by nearsightedness or farsightedness. Understanding the underlying causes and recognizing the symptoms correctly can help you choose the most appropriate treatment and restore visual clarity more effectively. Let’s explore how to identify the condition and the available eye care solutions.   Blurred Distance Vision: Nearsighted or Farsighted? Blurred distance vision can result from several types of refractive errors and is not limited to nearsightedness or farsightedness alone. Each condition presents different characteristics and symptoms, as outlined below. Nearsightedness (Myopia)Nearsightedness is a condition in which distant objects appear blurry while near objects remain clear. A common sign is the need to squint to see distant objects more clearly. Farsightedness (Hyperopia)In some cases, farsightedness may also cause blurred distance vision. However, the primary symptom is difficulty seeing nearby objects clearly, often accompanied by eye strain or headaches during prolonged focus. AstigmatismAstigmatism causes distorted, blurred, or shadowed vision at both near and far distances. Symptoms are often more noticeable at night, such as seeing lights as streaks or halos, which can significantly impair visual clarity.   How Ophthalmologists Diagnose Blurred Distance Vision To determine whether blurred distance vision is caused by nearsightedness, farsightedness, or astigmatism, a comprehensive eye examination by an ophthalmologist is essential. Accurate diagnosis allows for appropriate treatment planning. The diagnostic process typically includes the following steps: Visual Acuity Test Visual acuity is assessed using a Snellen chart, which displays letters of varying sizes. Patients are asked to read the chart from a fixed distance, enabling the ophthalmologist to evaluate whether blurred distance vision is due to myopia, hyperopia, or astigmatism. This test helps determine the clarity of vision and the severity of the refractive error for initial treatment planning. Manifest Refraction The ophthalmologist uses specialized instruments to measure refractive errors in detail. Patients look through a series of lenses to determine which provides the clearest vision. If distance or near vision remains unclear, the lenses are adjusted until optimal clarity is achieved. The final measurements are recorded for prescribing glasses or contact lenses. Comprehensive Eye Health Examination In addition to refraction testing, the ophthalmologist evaluates overall eye health to confirm whether blurred vision is solely due to refractive errors. This includes measuring intraocular pressure, examining the retina, and assessing the condition of the eye lens. If farsightedness is diagnosed and long-term correction is desired, LASIK surgery may be considered under professional medical guidance.   Treatment Options for Blurred Distance Vision Blurred distance vision can affect daily activities and overall quality of life. Fortunately, several effective treatment options are available: Prescription Glasses Wearing prescription glasses is the safest and most commonly recommended solution for improving distance vision. Convex or concave lenses are used to properly focus light onto the retina, making this option suitable for both nearsightedness and farsightedness. Contact Lenses For individuals who find glasses inconvenient—such as during sports or physically demanding activities—contact lenses are an alternative option. Proper hygiene, insertion, removal, and regular cleaning are essential to maintain eye safety and prevent infections. Surgical Options LASIK surgery is currently the most popular surgical method for correcting refractive errors, followed by implantable contact lenses (ICL). Both procedures carry potential risks and side effects, so a thorough consultation with an ophthalmologist or optometrist is necessary to make an informed decision.   Summary Blurred distance vision may be caused by nearsightedness, farsightedness, or other refractive conditions that impact visual quality and daily life. Accurate diagnosis by an ophthalmologist is crucial to identify the underlying cause and select the most suitable treatment—ranging from glasses and contact lenses to LASIK or implantable lenses. Bangkok Eye Hospital offers comprehensive eye examinations, advanced technology, and experienced specialists to help restore clear vision and enhance your quality of life.   Frequently Asked Questions About Blurred Distance Vision (FAQ) How can I tell if blurred distance vision is caused by nearsightedness or farsightedness? Nearsightedness causes difficulty seeing distant objects clearly while near vision remains sharp. Farsightedness primarily affects near vision but may also blur distant vision. If you frequently squint to read distant signs, nearsightedness is more likely. Does prolonged screen use cause nearsightedness? Extended screen time does not directly cause nearsightedness or farsightedness. However, it can lead to eye strain, headaches, and dry eyes. In individuals predisposed to myopia, excessive near work may accelerate symptom progression. Will wearing glasses all the time weaken my eyes?   Wearing glasses does not weaken eye muscles. On the contrary, uncorrected blurred vision forces the eyes to work harder, leading to eye strain and headaches. Properly prescribed glasses are essential for maintaining good eye health.  

Blurred or unfocused vision refers to difficulty seeing clearly or accurately focusing on objects at near or far distances. Common causes include refractive errors such as myopia, hyperopia, astigmatism, dry eyes, and excessive eye strain. Effective solutions include regular eye breaks, proper glasses or contact lenses, artificial tears, and consulting an ophthalmologist if symptoms persist. Blurred vision and difficulty focusing are common problems that can affect daily life. Understanding the causes and proper solutions can help restore clear, comfortable vision. This article explains what blurred and unfocused vision is, its causes, and practical eye care tips to protect your eye health. What Is Blurred or Unfocused Vision? Blurred or unfocused vision is a condition in which the eyes cannot see images clearly or maintain sharp focus. Vision may appear hazy, unclear, or difficult to focus, affecting one or both eyes. Symptoms can be temporary or chronic. Today, blurred or slow-to-focus vision is increasingly common across all age groups, especially among people who spend long hours using digital screens, such as office workers, students, and computer users. Without proper care, this condition can reduce work efficiency and overall quality of life. Temporary vs. Chronic Blurred Vision Temporary blurred vision is often caused by eye strain, dry eyes, or prolonged contact lens use. Symptoms usually improve with rest and proper eye care.Chronic blurred vision, however, is commonly linked to refractive errors or underlying eye diseases. It does not resolve on its own and requires proper diagnosis and treatment by an ophthalmologist to prevent long-term eye damage. Main Causes of Blurred and Unfocused Vision The causes of blurred and unfocused vision can be grouped into three main categories: refractive errors, eye health conditions, and lifestyle or environmental factors. Lifestyle and Environmental Factors These are the most common causes, including: Excessive eye use: Prolonged screen time strains eye muscles, leading to temporary blurred vision. Dry eyes: Insufficient tear production reduces visual clarity. Lack of sleep: Eye and brain fatigue can impair focusing ability. Environment: Air-conditioned rooms, wind, smoke, or dust can irritate the eyes. Refractive Errors Vision problems that affect focus include: Myopia, hyperopia, and astigmatism: Cause blurred vision at near or far distances. Presbyopia: Age-related loss of lens flexibility, making near vision unclear. Other Contributing Factors Underlying conditions: Diabetes, cataracts, or glaucoma may directly affect vision. Medications: Some drugs may cause temporary blurred vision as a side effect. Eye drops: Certain drops can cause short-term blurriness. Post-LASIK recovery: Temporary blurred vision may occur during the early healing phase and usually improves within a few days. How to Fix Blurred and Unfocused Vision To restore clear and comfortable vision, follow these eye care tips: Follow the 20-20-20 rule: Every 20 minutes, look 20 feet away for 20 seconds. Get an eye exam and wear properly prescribed glasses or contact lenses. Adjust lighting to avoid overly dim or bright environments. Eat eye-nourishing foods such as salmon, leafy greens, nuts, and berries. Use artificial tears to relieve dry eyes. Sleep at least 7–8 hours per night. Avoid screen use in dark environments. Practice eye exercises to reduce eye fatigue. Summary Blurred and unfocused vision can result from eye strain, dry eyes, or refractive errors. Regular eye breaks, proper lighting, balanced nutrition, and artificial tears can help relieve symptoms. If vision does not improve, a comprehensive eye examination at Bangkok Eye Hospital is recommended to accurately diagnose the cause and receive appropriate treatment. Frequently Asked Questions About Blurred Vision (FAQ) Can stress or anxiety cause unfocused vision? Yes. High stress can tense eye muscles and worsen dry eye symptoms, leading to temporary blurred or unfocused vision. What is the fastest way to relieve blurred vision? Resting the eyes using the 20-20-20 rule, blinking frequently, and using artificial tears are the quickest and most effective methods. If vision blurs for a few seconds and then clears, should I see a doctor? Occasional brief blurring may be due to eye strain or dryness. However, if it happens frequently or is accompanied by headaches or eye pain, consult an ophthalmologist for proper evaluation.

Normal vision refers to clear eyesight without the need for glasses or contact lenses. What is normal vision? It is measured at 20/20, meaning you can see objects clearly at 20 feet just as a person with normal eyesight. People with normal vision can see clearly at both near and far distances without blurriness or distortion. Eye examinations are recommended if you experience blurred vision, frequent eye strain or headaches, eye fatigue, or the need to squint to see clearly. Normal vision is a key indicator of overall eye health. Understanding what constitutes normal eyesight helps determine whether your vision falls within a healthy range or if there may be underlying issues affecting daily life. It also supports timely eye care planning and early diagnosis, helping prevent long-term vision problems effectively. What Is Normal Vision? What is normal vision? Normal vision refers to the ability to see clearly at all distances without visual aids. Medically, vision is measured using the “20/20” standard, meaning you can see clearly at 20 feet what a person with normal eyesight should see at the same distance. If your vision is 20/40, it means you must stand at 20 feet to see what a person with normal vision can see clearly at 40 feet. How Does Normal Vision Appear? In addition to knowing what normal vision is, understanding how people with normal eyesight perceive images can help identify abnormalities more easily. Normal vision includes: Clear and sharp images without blur, double vision, or distortion Accurate color perception with the ability to distinguish colors clearly Good night vision without glare, halos, or scattered light around sources When Should You Get an Eye Exam? If you experience any of the following symptoms, you should visit an ophthalmologist or optometrist promptly to assess your vision and detect potential eye conditions accurately. Blurred Vision If you experience blurred vision at near or far distances, an eye exam is recommended to determine whether your eyesight falls within the normal range or if conditions such as myopia, hyperopia, or astigmatism are present. Early diagnosis helps prevent complications and supports long-term visual clarity. Frequent Headaches or Eye Pain Recurring headaches or eye pain may be linked to uncorrected vision problems or prolonged visual strain. These symptoms can indicate changes in eyesight that require professional evaluation to prevent chronic discomfort and reduced quality of life. Squinting to See Clearly If you often need to squint to improve focus, it may signal refractive errors such as nearsightedness, farsightedness, or astigmatism. While squinting temporarily sharpens vision, frequent squinting can cause eye fatigue and headaches. Seeing Halos or Double Images Light glare, halos, or double vision may be associated with refractive errors or corneal and lens irregularities. These symptoms can impair night vision and increase accident risk if left untreated. Eye Strain or Fatigue Eye strain, heaviness around the eyes, dryness, or soreness often results from prolonged screen use or uncorrected vision. Persistent eye fatigue may indicate abnormal vision and should be evaluated to maintain eye comfort and health. Summary Normal vision means seeing clearly without visual aids. So, what is normal vision? Medically, it is defined as 20/20 eyesight, indicating the ability to see objects clearly at 20 feet, equivalent to the average person. If you notice visual abnormalities or are considering vision correction such as LASIK, a comprehensive eye examination at Bangkok Eye Hospital is recommended to assess eye health and receive appropriate care for optimal vision. Frequently Asked Questions About Normal Vision (FAQ) Can eyesight return to normal on its own? Permanent refractive errors such as nearsightedness, farsightedness, or astigmatism do not typically resolve on their own. Glasses, contact lenses, or corrective surgery are required to restore clear vision. Does 20/20 vision mean perfect eye health? While 20/20 indicates clear visual acuity, it does not guarantee overall eye health. Comprehensive eye exams are still essential to detect conditions such as glaucoma, cataracts, or retinal diseases that may not show early symptoms. Can eyesight change over time? Yes. Vision can change with age, particularly during adolescence and early adulthood. As people age, presbyopia may develop due to reduced lens flexibility, causing difficulty with near vision.