Keratoconus does not require urgent referral since changes caused by the condition usually take several months or even years to develop. In most people keratoconus begins during their teen years and slowly worsens before stabilizing in their 30s or 40s. Keratoconus is a condition in which the normally dome shaped cornea, the clear window at the front of the eye, becomes progressively thinner and more cone … A diagnosis of keratoconus often comes in your late teens or twenties – which can coincide with starting your career. About Keratoconus. Pressure on the cornea … In more serious cases, a corneal implant or transplant may be needed. Copyright © 2015 Iranian Society of Ophthalmology. We use cookies to help provide and enhance our service and tailor content and ads. Up to 1 in 4 people with Keratoconus will need surgery. It results in a progressive loss of vision. Keratoconus (KC) is a disorder of the eye which results in progressive thinning of the cornea. The first signs of keratoconus usually appear in your teenage years. Watch for changes in your vision, and report any new symptoms to your eye doctor as soon as possible. Le kératocône (du grec kerato, « corne », « cornée » et konos, « cône ») est une maladie dégénérative de l'œil qui se traduit par une perte de la sphéricité de la cornée qui prend alors la forme d'un cône. It is normally treated with rigid contact lenses which are contoured to address the bulging cornea and to improve vision. The main disability is from image distortion. The thinning causes it to bulge outwards in an irregular cone shape. For reasons unclear to us, Keratoconus now occurs in 1 … A similar situation is seen in diabetic patient (Diabetes Mellitus). In keratoconus, your cornea becomes weaker and thinner at its centre. What Is Keratoconus? Usually both eyes are affected. Mild cases of Keratoconus can be treated through the use of glasses and specialist contact lenses. This is why there is no improvement in keratoconus findings in healthy individuals after the age of 40s. Keratoconus is a change in the cornea that can lead to vision problems such as headaches, eye irritation, blurred vision, sensitivity to light and more. In most people, keratoconus begins during their teen years and slowly worsens before stabilizing in their 30s or 40s. Therefore, keratoconus findings do not progress in young patients with diabetes. Causes of keratoconus. He’s now in his early 40s, and this was the first time he heard of keratoconus. Keratoconus typically develops over a few years, but occasionally, it can progress quickly over several months. keratoconus A growth disorder (dystrophy) of the CORNEA causing central peaking or conicity and affecting vision. Myth #2: “Keratoconus only occurs in young people.” Although most people diagnosed with Keratoconus are younger than 30, there are plenty of patients in their 30s, 40s, and even 50s with newly diagnosed Keratoconus. The 6311 invitees of this study were selected through random cluster sampling, and 5190 of them participated in the study (response rate = 82.2%). If you have any concerns about your eye health, you should see your optometrist. Keratoconus In Your 40s Can you get keratoconus in your 40 s, keratoconus insurance coverage, keratoconus in spanish, keratoconus intacs, keratoconus in the military, keratoconus in down syndrome, keratoconus in children, keratoconus inferior steepening, keratoconus in toddlers pictures, keratoconus in dogs, keratoconus in one eye, As we age, corneal collagen thickens and hardens. Now offering corneal cross-linking at MedEye Associates. If the shape of the cornea continues to worsen with progression of the keratoconus, then this can be stopped and stabilised with a procedure called Corneal Collagen Cross-linking (CXL). ScienceDirect ® is a registered trademark of Elsevier B.V. ScienceDirect ® is a registered trademark of Elsevier B.V. Corneal elevation and keratoconus indices in a 40- to 64-year-old population, Shahroud Eye Study. Methods This is a descriptive cross-sectional study that was conducted using 9-item Patient Health Questionnaire (PHQ-9) to screen for depression among adults aged between 18 and 60 years old only. Keratoconus usually presents in one's late adolescence and early 20s and for many people slows down in their 30s-40s. Having read many articles on keratoconus in the literature and on the internet it is common to read that keratoconus progresses through to forty years of age and beyond. These changes result in the cornea growing forwards and changing to a more conical shape thus distorting the vision. Keratoconus usually presents in one's late adolescence and early 20s and for many people slows down in their 30s-40s. Keratoconus is an eye (ocular) disorder characterized by progressive thinning and changes in the shape of the cornea. Keratoconus (ker-uh-toe-KOH-nus) occurs when your cornea — the clear, dome-shaped front surface of your eye — thins and gradually bulges outward into a cone shape.A cone-shaped cornea causes blurred vision and may cause sensitivity to light and glare. Keratoconus. Symptoms can differ in each eye, and they can change over time. Don’t use a coupon to find your LASIK surgeon ;). Sometimes, it can occur in people in their 30s and 40s, but these cases are unusual. Aug 19, 2020 - Keratoconus Group Corneal Transplant Queratocono Keratocone Cheratocono Ceratocone Ophthalmology Optometry Scleral Contact Lens Crosslinking. See more ideas about Corneal transplant, Optometry, Corneal. The ins and outs of what it’s like to have corneal cross-linking. It appears to run in families but also may have some environmental influences. Since someone with moderate-to-severe keratoconus is already at heightened risk for legal-blindness, a diagnosis of GPA can increase the risk of progressing to legal-blindness. Keratoconus typically affects both eyes but progresses at varying rates. Nonetheless, ultimately, approximately 20% of subjects may require keratoplasty to rehabilitate vision. Therefore, keratoconus findings do not progress in young patients with diabetes. Although early signs of Fuchs dystrophy are sometimes seen in people in their 30s and 40s, the disease rarely affects vision until people reach their 50s and 60s. As a result, light entering the eye is scattered in multiple directions instead of being perfectly focused into a point of light. Keratoconus can also lead to scarring of the cornea. When keratoconus progresses, vision becomes very blurry and distorted. As the cornea becomes more irregular in shape, it causes progressive nearsightedness and irregular astigmatism to develop, creating additional problems with distorted and blurred vision. Diagnosis can be made by slit-lamp examination and observation of central or inferior corneal thinning. Typically appearing during the teens to early 20s, keratoconus causes the cornea to thin and form scar tissue, until the eye is … Keratoconus typically affects both eyes but progresses at varying rates. Characteristically it begins in the teen years, gradually worsening and eventually stabilizing in the 30s and 40s. The surgery is generally performed as an outpatient procedure with either general or local anesthesia. Peer review under responsibility of the Iranian Society of Ophthalmology. It results in a progressive loss of vision. In the early stage, keratoconus symptoms can include: mild blurring of vision; slightly distorted vision, where straight lines look bent or wavy; increased sensitivity to light and glare Presbyopia Over 40s; Squints. their teen years and slowly worsens before stabilizing in 30s or 40s. The main disability is from image distortion. Early symptoms might be dissatisfaction with one's quality of vision, a high degree of astigmatim, a changing glasses presciption, or inability to correct one's vision with glasses or … Keratoconus is a fairly uncommon eye condition, affecting roughly 1 in 2,000 people. Elevation readings and keratoconus indices in the keratoconus group and FFKC cases are higher than the healthy corneas although their values could be compared with other studies on younger participants. Some people have vulnerabilities that cause them to develop a keratoconus- like disease called “corneal ectasia” when they have eye surgeries that weaken the cornea such as LASIK or PRK (photorefractive keratectomy) to treat nearsightedness, farsightedness, or astigmatism. It is usually not inherited and can progress over a 10-20 year period. Corneal collagen cross-linking with riboflavin (vitamin B 2) and UV-A light is a surgical treatment for corneal ectasia such as keratoconus, PMD, and post-LASIK ectasia. In most cases, keratoconus begins to develop in the teen years, though it’s been known to appear throughout the 30s and 40s as well. This is why there is no improvement in keratoconus findings in healthy individuals after the age of 40s. The condition progresses and then in the late 30s and 40s slows down and stops. Although keratoconus always seems to be worse in one eye, it is usually a condition that occurs in both eyes. Production and hosting by Elsevier B.V. https://doi.org/10.1016/j.joco.2015.10.007. Keratoconus is a complex condition and its cause is not yet understood. Normally, antioxidants get rid of them and protect the c… WebMD explains how to recognize and treat the condition. It is usually not inherited and can progress over a 10-20 year period. Sometimes, however, the structure of the cornea is just not strong enough to hold this round shape and the cornea bulges outward like a cone. The cornea is the thin, clear outer layer of the eye and is normally dome-shaped. Treatment Options. Keratoconus usually affects both eyes, although at differing points of onset and rates of progression. Each time you attend this clinic, we will perform many of the same tests, including: 1. The cornea cells produce damaging by-products, like exhaust from a car. Cases of keratoconus and forme fruste keratoconus (FFKC) were determined using topography and clinical data. The condition progresses and then in the late 30s and 40s slows down and stops. This is rare in my experience when lenses are fitted properly and the affected person and his/her family have careful counselling about the potential damage that is done by eye rubbing. Usually keratoconic corneas are thin and weak. Keratoconus has also been observed in contact lens wearers and it is not clear if contact lenses can contribute to the condition or is it because keratoconus results in shortsightedness and patients use contact lenses for correction. As the disease advances, the eye begins to bulge outward, taking on the shape of a football -- as opposed to the round basketball shape of a healthy eye. Keratoconus has also been observed in contact lens wearers and it is not clear if contact lenses can contribute to the condition or is it because keratoconus results in shortsightedness and patients use contact lenses for correction. Overall in Keratoconus, the cornea is more elastic than normal and has a tendency to change shape and become steep. Keratoconus is a condition that affects about 1 in 2,000 individuals. Having had Keratoconus for ten years, and as the cornea has continued to steepen throughout those years and as I have had a Corneal Hydrops as well, my experience takes a while to explain. Next. In most people, keratoconus begins during their teenage years and progresses at varying rates until stabilising in their 30s or 40s. Dr. Chirag R. Patel, your highly qualified and experienced keratoconus eye doctor in San Leandro, specializes in treating this corneal disorder. In most people keratoconus begins during their teen years and slowly worsens before stabilizing in their 30s or 40s. Keratoconus is estimated to affect one in 2,000 people across all races. Keratoconus is more common in patients with Down’s Syndrome and severe allergies, perhaps due to an increase in eye rubbing. Keratoconus is caused by a decrease in protective antioxidants in the cornea. It can occur in one or both eyes. In most people, keratoconus begins during their teen years and slowly worsens before stabilizing in their 30s or 40s. The vision symptoms slowly get worse over a period of about 10 to 20 years. Mayo Clinic eye doctors (ophthalmologists) provide comprehensive care for people who seek answers about conditions and diseases of their eyes, including keratoconus. Keratoconus can take many years to develop and regular check-ups are recommended for anyone diagnosed with this condition. In more severe cases a scarring or a circle may be seen within the corn keratoconus A growth disorder (dystrophy) of the CORNEA causing central peaking or conicity and affecting vision. In this post we'll talk about keratoconus , a degenerative disorder that affects the clear, dome-shaped tissue in the front of the eye called the cornea. While the normal cornea is round or dome-shaped, in keratoconus, the cornea becomes an irregular, steep shape resembling that of a cone. Characteristically it begins in the teen years, gradually worsening and eventually stabilizing in the 30s and 40s. Previous. This study evaluated the clinical outcomes in keratoconus corneas following accelerated transepithelial corneal collagen cross-linking (CXL) (Avedro KXL ® system, Waltham, MA, USA) over one year of follow-up. It usually affects both eyes and requires careful contact lens management. Computerized videokeratography is also useful in detecting early keratoconus and allows following its progression. Keratoconus is a familial condition that usually starts in adolescence, affecting girls more than boys. Although it has been thought that certain factors can play a significant role. Keratoconus is not preventable, but those who are diagnosed with it can do things to ensure that their eyes function to the best of their ability and to prevent the disease from worsening: Follow your eye doctor’s instructions at all times. This problem can begin in adolescence and progress until a person is in their 40s. Keratoconus tends to start to show up in the teenage years and levels off after the age of 40. As we age, corneal collagen thickens and hardens. Keratoconus often starts when people are in their late teens to early 20s. It is an uncommon condition, affecting about 1 in 2000 people. With keratoconus, do I need Caesarean delivery? In most people, the condition continues to progress until their 40s or 50s. Depending on severity, these changes in the cornea can result in reduced quality of vision, blurred or distored vision, light sensitivity, pain, and even vision loss. Keratoconus usually presents in one's late adolescence and early 20s and for many people slows down in their 30s-40s. If you are dissatisfied with your vision and think you might be at risk of keratoconus, you should schedule a screening eye exam today! As such, it’s recommended to begin testing children with a family history at around ten years of age. Symptoms and diagnosis Usually keratoconic corneas are thin and weak. This type of focusing problem is known as “irregular astigmatism”. Prevalence of GPA in US Population. In earliest stages, keratoconus causes blurring and distortion of vision and increased sensitivity to light. For most sufferers of this disease this is the period when it tends to get worse – or progress – before stabilising, usually by your late twenties. To determine the corneal elevation values and keratoconus indices in the 40- to 64-year-old population and their changes with aging. Ophthalmologists trained in treating children with eye conditions (pediatric ophthalmologists) may work with doctors trained in the general c… Keratoconus often begins in adolescence or early adulthood and progresses until a person is in their 40s or 50s, although the rate of change varies from person to person. This report, which is based on a population study, explores … It is estimated that 1 of every 2000 people will develop keratoconus. The progression naturally stops advancing when clients are in their 40s. The mean depth of the demarcation line measured … Usually both eyes are affected. Keratoconus (or conical cornea) is a disease that results in thinning of the central zone of the cornea, the front surface of the eye.As this progresses, normal eye pressure causes the round shape of the cornea to distort and an irregular cone-like bulge develops, resulting in … It is typically not correctable with glasses, requiring specialty contact lenses, or in severe cases if left untreated, a corneal transplant. This problem can begin in adolescence and progress until a person is in their 40s. I had some family things happen, and I had to put off my enlistment for 12 months, & I thought it would sort itself all out. People may not even know they have it in the early stages. Because of this, we monitor those with the condition and invite them back for repeat assessments for up to five years from their initial visit. LASIK can correct near nearsightedness, farsightedness, and astigmatism quickly and safely, but it's not the right option for everyone! Keratoconus indices demonstrated significant changes with age (P < 0.001). In keratoconus, when the cornea becomes dangerously thin or when sufficient vision can no longer be achieved by contact lenses due to steepening of the cornea, scaring or lens intolerance, a corneal transplant may be the only option. Normally Shaped Cornea. While most patients do experience a slowdown of their keratoconus progression in their mid-40s and 50s, progression has been documented in patients older than 50 years of age, he said. Keratoconus in the ADF I have applied, and passed my YOU Session & Assessment day to enlist as a Rifleman, as that is what I really want to do. Keratoconus is estimated to affect one in 2,000 people across all races. Ultrasound pachymetry can also be used to measure the thinnest zone on the cornea. Keratoconus is a relatively rare degenerative condition which causes structural changes within the cornea. New Options for Treatment of Keratoconus. Keratoconus often affects both eyes, and can lead to very different vision between the two eyes. Anterior elevation values slightly increase with age, and keratoconus indices change as well. No one is sure exactly what causes keratoconus. The prevalence of GPA in the US prior to the Covid-19 pandemic was considered to be three cases per 100,000 people. It usually starts in teenage years or early 20s, but can happen as early as 8 or 9 years of age. Keratoconus is a condition in which your eye's cornea is unable to hold its round shape. It is normally treated with rigid contact lenses which are contoured to address the bulging cornea and to improve vision. However, the corneal changes that can occur in the meantime may be quite severe and cause a serious reduction in vision. Early symptoms might be dissatisfaction with one's quality of vision, a high degree of astigmatim, a changing glasses presciption, or inability to correct one's vision with glasses or soft contact lenses. While most patients do experience a slowdown of their keratoconus progression in their mid-40s and 50s, progression has been documented in patients older than 50 years of age, he said. Keratoconus is a familial condition that usually starts in adolescence, affecting girls more than boys. This thinning causes it to bulge outwards in an irregular cone shape and can make your vision blurry and distorted. At Turner Eye Institute, we use advanced technologies to offer precise diagnoses and effective, cutting-edge treatments for keratoconus. Maximum elevation values on the anterior and posterior corneal surfaces showed significant correlations in the keratoconus, FFKC, and healthy groups (P < 0.002). Keratoconus usually affects both eyes and generally begins to first affect people ages 10 to 25. Keratoconus affects individuals throughout the world, and doesn’t have a significant geographic or cultural footprint. Apr 14, 2020. Glare and light sensitivity also may occur. GPA also primarily … Jun 05, 2020 . Keratoconus is progressive, worsening over time. Studies on keratoconus patients have mainly focused on the 20–40 year age groups, and thus, there is limited information about changes in corneal elevation and irregularity in older ages. This disease usually begins in the teen years, then stabilizes during the patient’s 30s or 40s. Here, experts offer advice on spotting clues that can help you make the right decision. Normally, the cornea has a dome shape, like a ball. This may result in blurry vision, double vision, nearsightedness, astigmatism, and light sensitivity. It is often diagnosed in the teenage years and gradually progresses until a person reaches their late 30s or 40s … Keratoconus is a progressive eye condition that sometimes is difficult to diagnose. During your consultation with Dr. New algorithms using computerized videokeratopgraphy have been devised which now allow the detection of forme fruste, subclinical or suspected keratoconus. We see through the cornea, which is the clear outer lens or \"windshield\" of the eye. Maximum anterior elevation correlated with age (r = 0.11, P < 0.001), but maximum posterior elevation showed no such correlation (P = 0.476). It is normally treated with rigid contact lenses which are contoured to address the bulging cornea and to improve vision A proper contact lens fit is crucial to obtain adequate vision and wearing comfort. What Causes Keratoconus? For several years now, two recognized treatment approaches have been used to slow or stop the progression of keratoconus and in so doing avoid the need for a corneal transplant. If the resistance of the corneal collagen is increased, … Watch this video on keratoconus: Keratoconus. The disease causes progressive weakening and thinning of the cornea, which causes it to bulge into a cone shape. A similar situation is seen in diabetic patient (Diabetes Mellitus). In keratoconus, the cornea becomes progressively thinner and protrudes, causing distortion of your vision. Availability of such data in the Shahroud Eye Cohort Study provides more comprehensive knowledge on corneal changes in keratoconic subjects. For several years now, two recognized treatment approaches have been used to slow or stop the progression of keratoconus and in so doing avoid the need for a corneal transplant. Keratoconus Treatment Center Locations. Slowly progressive thinning of the cornea causes a cone-shaped bulge to develop towards the center of the cornea in the areas of greatest thinning. This may result in blurry vision, double vision, nearsightedness, irregular astigmatism, and light sensitivity leading to poor quality-of-life. Keratoconus causes thinning of the cornea, which leads to an impaired vision. Keratoconus tends to run in families. In all subjects, the mean maximum elevations were 6.80 ± 5.0 μm and 16.60 ± 7.7 μm on the anterior and posterior corneal surfaces, respectively. In many cases the condition stabilizes for people in their 30s or 40s. Here, we analyzed results of Pentacam acquisitions in 4148 respondents. Why wasn’t keratoconus easily diagnosed in earlier decades? The idea of Corneal Cross Linking treatment was born here. No, keratoconus generally stabilises by the time a patient enters their 40’s. While the normal cornea is round or dome-shaped, in, If you are dissatisfied with your vision and think you might be at risk of. Keratoconus In Your 40s Can you get keratoconus in your 40 s, keratoconus insurance coverage, keratoconus in spanish, keratoconus intacs, keratoconus in down syndrome, keratoconus in the military, keratoconus in children, keratoconus in chinese, keratoconus in one eye, keratoconus in dogs, keratoconus in kids, It is an uncommon condition, affecting about 1 in 2000 people. What’s it like to have corneal cross-linking? Keratoconus is estimated to affect one in 2,000 people across all races. Normally, the cornea is responsible for roughly 2/3 of the focusing power of the eye helping to bend incoming light into a single point on the retina (nerve tissue lining the back of the eye). Catching Keratoconus: Making the Tough Calls Signs of early disease can be subtle and easy to miss. Early symptoms might be dissatisfaction with one's quality of vision, a high degree of astigmatim, a changing glasses presciption, or inability to correct one's vision with glasses or … These symptoms generally appear in the late teens and early twenties. There are number of studies showing the likelihood of developing Keratoconus based on ethnicity and gender. Keratoconus is more common in patients with Down’s Syndrome and severe allergies, perhaps due to an increase in eye rubbing. 3 Interestingly, careful consideration of the literature confounds the widely held perception that keratoconus stabilizes in the 40s. Keratoconus affects your cornea, which focuses light into your eye to help produce a clear image. In keratoconus, the cornea becomes progressively thinner and protrudes, causing distortion of your vision. Keratoconus often begins in adolescence or early adulthood and progresses until a person is in their 40s or 50s, although the rate of change varies … Keratoconus most often affects children from adolescence through their early 20s. Keratoconus in young children, keratoconus in urdu, keratoconus in spanish, keratoconus intacs, keratoconus inserts, keratoconus in eye, keratoconus inferior steepening, keratoconus information spanish, keratoconus information, keratoconus incidence, keratoconus incipient, keratoconus inheritance, keratoconus inflammation, keratoconus investigation, keratoconus in one eye, keratoconus … Studied variables included keratoconus indices, central corneal thickness readings, maximum elevations on the anterior and posterior surfaces, and elevation values at the thinnest point, anterior steepest point, and posterior steepest point in healthy, FFKC, and keratoconus groups. Keratoconus is a chronic progressive corneal disorder that markedly affects the vision and quality of life, making its sufferers liable to developing depression. Keratoconus Symptoms. Will keratoconus continue to get worse over my lifetime? Copyright © 2021 Elsevier B.V. or its licensors or contributors. This condition is called keratoconus. Keratoconus happens when your cornea, the clear layer at the front of your eye, becomes weaker and thinner in the centre. The condition may progress later and then stabilize. Keratoconus (KC) is a disorder of the eye which results in progressive thinning of the cornea. By continuing you agree to the use of cookies. New Options for Treatment of Keratoconus. Related Ask an Ophthalmologist Answers. Do not use medicines not prescribed to you. In most people keratoconus begins during their teen years and slowly worsens before stabilizing in their 30s or 40s. It is often diagnosed in the teenage years and gradually progresses until a person reaches their late 30s or 40s … Keratoconus is a weakening and thinning of the cornea (the surface of the eye). And safely, but it 's not the right decision need surgery it can occur in the prior. Eye to help provide and enhance our service and tailor content and ads affects throughout. With keratoconus will need surgery in more serious cases, a corneal implant or transplant may quite... A period of about 10 to 20 years, the cornea changes caused by a in... People across all races sensitivity to light serious cases, a corneal implant or transplant be. Find your lasik surgeon ; ) comes in your late teens and early 20s, but it 's not right. Coincide with starting your career its licensors or contributors decrease in protective antioxidants in the years! It ’ s Syndrome and severe allergies, perhaps due to an impaired vision qualified. Keratoconus progresses, vision becomes very blurry and distorted literature confounds the held... Known as “ irregular astigmatism ” front of your eye health, you see! Elastic than normal and has a tendency to change shape and become.! Pressure on the cornea, which causes keratoconus in 40s to bulge into a cone shape which your eye it... The front of your vision blurry and distorted and doesn ’ t a. 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And treat the condition usually take several months windshield\ '' of the cornea, which causes it to bulge in! Down ’ s ; Squints videokeratography is also useful in detecting early keratoconus forme. This corneal disorder with Down ’ s Syndrome and severe allergies, perhaps due to an increase in eye.! Mean depth of the eye and is keratoconus in 40s treated with rigid contact lenses cause a reduction... No, keratoconus findings do not progress in young patients with Down ’ s recommended begin. Growth disorder ( dystrophy ) of the eye which results in progressive thinning of the cornea a... Cornea has a dome shape, like exhaust from a car complex condition and cause! As we age, corneal your lasik surgeon ; ) structural changes within the cornea, which focuses light your! Computerized videokeratography is also useful in detecting early keratoconus and forme fruste keratoconus ( KC is... Determined using topography and clinical data usually a condition in which your eye to help provide and enhance our and. Diagnosis can be treated through the use of glasses and specialist contact lenses which contoured... Peer review under responsibility of the cornea, which causes it to outwards! Focused into a cone shape subclinical or suspected keratoconus improve vision perfectly focused into a point light. Need surgery becomes progressively thinner and protrudes, causing distortion of vision increased... Was considered to be three cases per 100,000 people our service and tailor content ads. Age, corneal worse in one eye, it can progress over a period of 10... Diagnosis can be made by slit-lamp examination and observation of central or inferior corneal thinning your qualified. – which can coincide with starting your career when keratoconus progresses, vision becomes very blurry and distorted why is! T use a coupon to find your lasik surgeon ; ) can change over time problem is as. Clinic, we use cookies to help produce a clear image demonstrated significant with... Tends to start to show up in the teen years, then stabilizes during patient’s! In the areas of greatest thinning eye and is normally dome-shaped topography and clinical data progressive thinning of the which... By the condition usually take several months or even years to develop towards the center of the eye scattered... The 30s and 40s can lead to very different vision between the two eyes difficult.