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Macular degeneration

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Macular degeneration
Intermediate age related macular degeneration.jpg
Picture of the back of the eye showing intermediate age-related macular degeneration
Classification and external resources
Specialty Ophthalmology
ICD-10 H35.3
ICD-9-CM 362.50
DiseasesDB 11948
MedlinePlus 001000
eMedicine article/1223154
Patient UK Macular degeneration
MeSH D008268

Macular degeneration, also known as age-related macular degeneration (AMD or ARMD), is a medical condition which may result in blurred or no vision in the center of the visual field.[1] Early on there are often no symptoms. Over time, however, some people experience a gradual worsening of vision that may affect one or both eyes. While it does not result in complete blindness, loss of central vision can make it hard to recognize faces, drive, read, or perform other activities of daily life. Visual hallucinations may also occur but these do not represent a mental illness.[1]

Macular degeneration typically occurs in older people. Genetic factors and smoking also play a role. It is due to damage to the macula of the retina. Diagnosis is by a complete eye exam. The severity is divided into early, intermediate, and late types.[1] The late type is additionally divided into "dry" and "wet" forms with the dry form making up 90% of cases.[1][2]

Prevention includes exercising, eating well, and not smoking.[1] Antioxidant vitamins and minerals do not appear to be useful for prevention.[3] There is no cure or treatment that returns vision already lost. In the wet form, anti-VEGF medication injected into the eye or less commonly laser coagulation or photodynamic therapy may slow worsening.[1] Supplements in those who already have the disease may slow progression.[4]

In 2010 it affected 23.5 million people globally.[5] In 2013 moderate to severe disease affected 13.4 million and it is the fourth most common cause of blindness after cataracts, preterm birth, and glaucoma.[6] It most commonly occurs in people over the age of fifty and in the United States is the most common cause of vision loss in this age group.[1][2] About 0.4% of people between 50 and 60 have the disease, while it occurs in 0.7% of people 60 to 70, 2.3% of those 70 to 80, and nearly 12% of people over 80 years old.[2]

Signs and symptoms[edit]

Normal vision
The same view with age-related macular degeneration (National Eye Institute)

Signs and symptoms of macular degeneration include:

Visual symptoms

  • Distorted vision in the form of metamorphopsia, in which a grid of straight lines appears wavy and parts of the grid may appear blank: Patients often first notice this when looking at things like miniblinds in their home or telephone poles while driving. There may also be central scotomas, shadows or missing areas of vision
  • Slow recovery of visual function after exposure to bright light (photostress test)
  • Visual acuity drastically decreasing (two levels or more), e.g.: 20/20 to 20/80
  • Blurred vision: Those with nonexudative macular degeneration may be asymptomatic or notice a gradual loss of central vision, whereas those with exudative macular degeneration often notice a rapid onset of vision loss (often caused by leakage and bleeding of abnormal blood vessels).
  • Trouble discerning colors, specifically dark ones from dark ones and light ones from light ones
  • A loss in contrast sensitivity

Macular degeneration by itself will not lead to total blindness. For that matter, only a very small number of people with visual impairment are totally blind. In almost all cases, some vision remains, mainly peripheral. Other complicating conditions may possibly lead to such an acute condition (severe stroke or trauma, untreated glaucoma, etc.), but few macular degeneration patients experience total visual loss.[7]

The area of the macula comprises only about 2.1% of the retina, and the remaining 97.9% (the peripheral field) remains unaffected by the disease. Even though the macula provides such a small fraction of the visual field, almost half of the visual cortex is devoted to processing macular information.[8]

The loss of central vision profoundly affects visual functioning. It is quite difficult, for example, to read without central vision. Pictures that attempt to depict the central visual loss of macular degeneration with a black spot do not really do justice to the devastating nature of the visual loss. This can be demonstrated by printing letters six inches high on a piece of paper and attempting to identify them while looking straight ahead and holding the paper slightly to the side. Most people find this difficult to do.

Risk factors[edit]

Environment and lifestyle[edit]

  • Smoking: Smoking tobacco increases the risk of AMD by two to three times that of someone who has never smoked, and may be the most important modifiable factor in its prevention. A review of previous studies found "a strong association between current smoking and AMD. ... Cigarette smoking is likely to have toxic effects on the retina."[9]
  • Hypertension (high blood pressure): In the ALIENOR study 2013, early and late AMD were not significantly associated with systolic or diastolic BP, hypertension, or use of antihypertensive medications, but elevated pulse pressure ((PP) systolic BP minus diastolic BP) was significantly associated with an increased risk of late AMD.[10]
  • Atherosclerosis:
  • High cholesterol: Elevated cholesterol may increase the risk of AMD[11]
  • Obesity: Abdominal obesity is a risk factor, especially among men[12]
  • Fat intake: Consuming high amounts of certain fats including saturated fats, trans fats and omega-6 fatty acids likely contributes to AMD, while monounsaturated fats are potentially protective.[13] In particular, ω-3 fatty acids may decrease the risk of AMD.[14]
  • Exposure to sunlight,[dubious ] especially blue light: Evidence is conflicting as to whether exposure to sunlight contributes to the development of macular degeneration. A recent study on 446 subjects found it does not.[15] Other research, however, has shown high-energy visible light may contribute to AMD.[16][17]

Genetics[edit]

Recurrence ratios for siblings of an affected individual are three- to sixfold higher than in the general population.[18] Genetic linkage analysis has identified 5 sets of gene variants at three locations on different chromosomes (1, 6 and 10) as explaining at least 50% of the risk. These genes have roles regulating immune response, inflammatory processes and homeostasis of the retina. Variants of these genes give rise to different kinds of dysfunction in these processes. Over time, this results in accumulation of intracellular and extracellular metabolic debris. This can cause scarring of the retina or breakdown of its vascularization.

Genetic tests are available for some of these gene variations. However, pathogenesis of macular degeneration is a complex interaction between genetics, environment and lifestyle, and presence of unfavorable genetic factors doesn't necessarily predict progression to disease. The three loci where identified gene variants are found are designated:

  • Complement Factor H (CFH) on chromosome 1 at location 1q31.3
  • HTRA serine peptidase 1/Age Related Maculopathy Susceptibility 2 (HTRA1/ARMS2) on chromosome 10 at location 10q26
  • Complement Factor B/Complement Component 2 (CFB/CC2) on chromosome 6 at 6p21.3

Specific genes[edit]

  • Polymorphisms in genes for complement system proteins: The genes for the complement system proteins factor H (CFH), factor B (CFB) and factor 3 (C3) are strongly associated with a person's risk for developing AMD. CFH is involved in inhibiting the inflammatory response. The mutation in CFH (Y402H) results in reduced ability of CFH to regulate complement on critical surfaces such as the retina and leads to increased inflammatory response within the macula. Absence of the complement factor H-related genes R3 and R1 protects against AMD.[19][20] Two independent studies in 2007 showed a certain common mutation Arg80Gly in the C3 gene, which is a central protein of the complement system, is strongly associated with the occurrence of AMD.[21][22] The authors of both papers consider their study to underscore the influence of the complement pathway in the pathogenesis of this disease.
  • In two 2006 studies, another gene that has implications for the disease, called HTRA1 (encoding a secreted serine protease), was identified.[23][24]
  • Six mutations of the gene SERPING1 (Serpin Peptidase Inhibitor, Clade G (C1 Inhibitor), Member 1) are associated with AMD. Mutations in this gene can also cause hereditary angioedema.[25]
  • Fibulin-5 mutation: Rare forms of the disease are caused by genetic defects in fibulin-5, in an autosomal dominant manner. In 2004, Stone et al. performed a screen on 402 AMD patients and revealed a statistically significant correlation between mutations in fibulin-5 and incidence of the disease.

Mitochondrial related gene polymorphisms[edit]

such as that in the MT-ND2 molecule, predicts wet AMD.[26][27]

Pathophysiology[edit]

Human eye cross-sectional view

The pathogenesis of age-related macular degeneration is not well known, although a number of theories have been put forward, including oxidative stress, mitochondrial dysfunction, and inflammatory processes.

The imbalance between production of damaged cellular components and degradation leads to the accumulation of detrimental products, for example, intracellular lipofuscin and extracellular drusen. Incipient atrophy is demarcated by areas of RPE thinning or depigmentation that precede geographic atrophy in the early stages of AMD. In advanced stages of AMD, atrophy of the RPE (geographic atrophy) and/or development of new blood vessels (neovascularization) result in death of photoreceptors and central vision loss.

In the dry (nonexudative) form, cellular debris called drusen accumulates between the retina and the choroid, causing atrophy and scarring to the retina. In the wet (exudative) form, which is more severe, blood vessels grow up from the choroid (neovascularization) behind the retina which can leak exudate and fluid and also cause hemorrhaging.

Early work demonstrated a family of immune mediators was plentiful in drusen.[28] Complement factor H (CFH) is an important inhibitor of this inflammatory cascade, and a disease-associated polymorphism in the CFH gene strongly associates with AMD.[29][30][31][32][33] Thus an AMD pathophysiological model of chronic low grade complement activation and inflammation in the macula has been advanced.[34][35] Lending credibility to this has been the discovery of disease-associated genetic polymorphisms in other elements of the complement cascade including complement component 3 (C3).[36]

A powerful predictor of AMD is found on chromosome 10q26 at LOC 387715. An insertion/deletion polymorphism at this site reduces expression of the ARMS2 gene though destabilization of its mRNA through deletion of the polyadenylation signal.[37] ARMS2 protein may localize to the mitochondria and participate in energy metabolism, though much remains to be discovered about its function.

Other gene markers of progression risk includes tissue inhibitor of metalloproteinase 3 (TIMP3), suggesting a role for intracellular matrix metabolism in AMD progression.[38] Variations in cholesterol metabolising genes such as the hepatic lipase, cholesterol ester transferase, lipoprotein lipase and the ABC-binding cassette A1 correlate with disease progression. The early stigmata of disease, drusen, are rich in cholesterol, offering face validity to the results of genome-wide association studies.[39]

Stages[edit]

In AMD there is a progressive accumulation of characteristic yellow deposits, called drusen (buildup of extracellular proteins and lipids), in the macula (a part of the retina), between the retinal pigment epithelium and the underlying choroid which is believed to damage the retina over time. Amyloid beta, which builds up in Alzheimer's disease brains, is one the proteins accumulating in AMD, which is one of the reasons AMD is sometimes called "Alzheimer's of the eye" or "Alzheimer's of the retina".[40] AMD can be divided into 3 stages: early, intermediate, and late, based partially on the extent (size and number) of drusen.[1]

AMD-like pathology begins with small yellow deposits (drusen) in the macula, between the retinal pigment epithelium and the underlying choroid. Most people with these early changes (referred to as age-related maculopathy) still have good vision. People with drusen may or may not develop AMD, in fact the majority of people over age 60 have drusen with no negative effects. The risk of developing symptoms is higher when the drusen are large and numerous and associated with disturbance in the pigmented cell layer under the macula. Large and soft drusen are thought to be related to elevated cholesterol deposits.

Early AMD[edit]

Early AMD is diagnosed based on the presence of medium sized drusen, about the width of an average human hair. Early AMD is usually asymptomatic.[1]

Intermediate AMD[edit]

Intermediate AMD is diagnosed by large drusen, irreversible retinal damage (atrophy) caused by cell death, or both. Intermediate AMD may cause some vision loss, however, like Early AMD, it is usually asymptomatic.[1]

Late AMD[edit]

In late AMD, enough retinal damage occurs that people have symptomatic central vision loss in addition to drusen. The damage can ether be worsening of atrophy from Intermediate AMD or the onset of Neovascular disease. Late AMD is further divided into two subtypes based on the types of damage: Dry AMD, and Wet AMD (also called Neovascular AMD).[1]

Dry AMD[edit]

In dry AMD (also called atrophic AMD), patients have symptomatic central vision loss due to retinal atrophy. This form is the most common type of clinical AMD, accounting for 80-90% of cases and progresses slowly. In 10-20% of people, it progresses to the wet type.

Wet AMD[edit]

Neovascular or exudative AMD, the "wet" form of advanced AMD, causes vision loss due to abnormal blood vessel growth (choroidal neovascularization) in the choriocapillaris, through Bruch's membrane. It is usualy, but not always, preceded by the dry form of AMD. The proliferation of abnormal blood vessels in the retina is stimulated by vascular endothelial growth factor (VEGF). Unfortunately, because these blood vessels are abnormal, these new vessels are fragile, ultimately leading to blood and protein leakage below the macula. Bleeding, leaking, and scarring from these blood vessels eventually cause irreversible damage to the photoreceptors and rapid vision loss if left untreated.

Oxidative stress[edit]

Age-related accumulation of low-molecular-weight, phototoxic, pro-oxidant melanin oligomers within lysosomes in the retinal pigment epithelium (RPE) may be partly responsible for decreasing the digestive rate of photoreceptor outer rod segments (POS) by the RPE - autophagy. A decrease in the digestive rate of POS has been shown to be associated with lipofuscin formation - a classic sign associated with AMD.[41][42]

The role of retinal oxidative stress in the etiology of AMD by causing further inflammation of the macula is suggested by the enhanced rate of disease in smokers and those exposed to UV irradiation.[43][44][45]

Mitochondrial dysfunction may play a role.[46]

Diagnosis[edit]

Super resolution microscopic investigation of human eye tissue affected by AMD

Diagnosis of age-related macular degeneration rests on signs in the macula, irrespective of visual acuity. Diagnosis of AMD may include the following procedures and tests:

Histology[edit]

  • Pigmentary changes in the retina - In addition to the pigmented cells in the iris (the colored part of the eye), there are pigmented cells beneath the retina. As these cells break down and release their pigment, dark clumps of released pigment and later, areas that are less pigmented may appear
  • Exudative changes: hemorrhages in the eye, hard exudates, subretinal/sub-RPE/intraretinal fluid
  • Drusen, tiny accumulations of extracellular material that build up on the retina. While there is a tendency for drusen to be blamed for the progressive loss of vision, drusen deposits can be present in the retina without vision loss. Some patients with large deposits of drusen have normal visual acuity. If normal retinal reception and image transmission are sometimes possible in a retina when high concentrations of drusen are present, then, even if drusen can be implicated in the loss of visual function, there must be at least one other factor that accounts for the loss of vision.

Prevention[edit]

A 2012 Cochrane review found the use of vitamin and mineral supplements, alone or in combination, by the general population had no effect on whether or not AMD started.[3]

Management[edit]

Supplements that include lutein and zeaxanthin may slow down the worsening of AMD.[4][49] They have; however, not been shown to prevent the disease.[49] There is not enough evidence to determine if statins have a role in preventing or slowing the progression of AMD.[50] Antiangiogenic steroids such as anecortave acetate and triamcinolone acetonide have shown no evidence in preventing visual loss in people with neovascular AMD.[51]

Dry AMD[edit]

No medical or surgical treatment is available for this condition.

Wet AMD[edit]

It can be treated with laser coagulation, and more commonly with medication that stops and sometimes reverses the growth of blood vessels.[52][53] There is strong evidence that laser coagulation will result in the disappearance of drusens but does not affect choroidal neovascularisation.[54]

A randomized control trial found that bevacizumab and ranibizumab had similar efficacy, and reported no significant increase in adverse events with bevacizumab.[55] A 2014 Cochrane review found that the systemic safety of bevacizumab and ranibizumab are similar when used to treat neovascular AMD, except for gastrointestinal disorders.[56] Bevacizumab however is not FDA approved for treatment of macular degeneration. A controversy in the UK involved the off-label use of cheaper bevacizumab over the approved, but expensive, ranibizumab.[57] Ranibizumab is a smaller fragment, Fab fragment, of the parent bevacizumab molecule specifically designed for eye injections. Other approved antiangiogenic drugs for the treatment of neo-vascular AMD include pegaptanib[58] and aflibercept.[59]

Laser coagulation is feasible in only limited cases. Only about 15 out of 100 cases can be effectively treated with laser photocoagulation surgery. The surgery works best when the abnormal blood vessels (choroidal neovascularization) are clustered close together in a specific area. Blood vessels that are scattered over a wider area are much harder to treat. Surgery is also less helpful after the abnormal blood vessels reach the center of the macula (fovea). The procedure cannot restore lost vision, only slow progression of the disease. Laser treatment almost always causes some immediate, permanent central vision loss (a central blind spot). And laser treatment does not always prevent future growth of abnormal blood vessels.

Photodynamic therapy has also been used to treat wet AMD.[60] The drug verteporfin is administered intravenously; light of a certain wavelength is then applied to the abnormal blood vessels. This activates the verteporfin destroying the vessels.

Cataract surgery could possibly improve visual outcomes for people with AMD, though there have been concerns of surgery increasing the progression of AMD. A randomized controlled trial found that people who underwent immediate cataract surgery (within 2 weeks) had improved visual acuity and better quality of life outcomes than those who underwent delayed cataract surgery (6 months).[61]

Adaptive devices[edit]

Josef Tal, an Israeli composer who was affected by macular degeneration, checks a manuscript using a CCTV desktop unit.

Because peripheral vision is not affected, people with macular degeneration can learn to use their remaining vision to partially compensate.[62] Assistance and resources are available in many countries and every state in the U.S.[63] Classes for "independent living" are given and some technology can be obtained from a state department of rehabilitation.

Adaptive devices can help people read. These include magnifying glasses, special eyeglass lenses, computer screen readers, and TV systems that enlarge reading material.

Computer screen readers such as JAWS or Thunder work with standard Windows computers. Also Apple devices provide wide range of features (voice over,screen readers, Braille etc.,

Video cameras can be fed into standard or special-purpose computer monitors, and the image can be zoomed in and magnified. These systems often include a movable table to move the written material.

Accessible publishing provides larger fonts for printed books, patterns to make tracking easier, audiobooks and DAISY books with both text and audio.

Epidemiology[edit]

Disability-adjusted life year for macular degeneration and other (sense organ diseases) per 100,000 inhabitants in 2004[64]
  no data
  less than 100
  100-114
  114-128
  128-142
  142-156
  156-170
  170-184
  184-198
  198-212
  212-226
  226-240
  more than 240

Age-related macular degeneration accounts for more than 54% of all vision loss in the white population in the USA.1 An estimated 8 million Americans are affected with early age-related macular degeneration, of whom over 1 million will develop advanced age-related macular degeneration within the next 5 years. In the UK, age-related macular degeneration is the cause of blindness in almost 42% of those who go blind aged 65–74 years, almost two-thirds of those aged 75–84 years, and almost three-quarters of those aged 85 years or older.

Data pooled from three population-based studies—the Beaver Dam Eye Study, the Rotterdam Study, and the Blue Mountains Eye Study—have estimated the prevalence of advanced age-related macular degeneration to be 0·2% in those aged 55–64 years, increasing to 13% in those older than 85 years. These three large population-based studies have found that the incidence of advanced age-related macular degeneration increases with age, as does the development of large drusen and pigmentary changes. The Blue Mountains Eye Study estimated the overall 5-year incidence of advanced age-related macular degeneration to be 1·1%; increasing from 0% in individuals under 60 years of age to 5·4% in those aged 80 years or older. The overall 5-year incidence of the development of large drusen or pigmentary changes was 8·7%, ranging from 3·2% in those aged less than 60 years to 18·3% in those aged 70–79 years and 14·8% in those older than 80 years.17,18 The 15-year incidence of neovascular macular degeneration in the Beaver Dam Eye Study ranged from 0·4% in individuals under 55 years of age to 4·4% in those older than 75 years; the 15-year incidence of soft indistinct drusen ranged from 4·7% to 16·3% in the same age-groups. The 5-year progression rate to advanced age-related macular degeneration in individuals who had intermediate age-related macular degeneration and who were 80 years or older was 42% in the Rotterdam Study.20 The 5-year progression rate to advanced age-related macular degeneration in another population-based study—the Visual Impairment Project from Melbourne, Australia—ranged from 0% in people aged 60 years and younger to 6·3% in those 80 years and older.21

Macular degeneration is more likely to be found in Caucasians than in people of African descent.[65][66]

Research directions[edit]

Association with other age-related diseases[edit]

Studies indicate drusen associated with AMD are similar in molecular composition to Beta-Amyloid (βA) plaques and deposits in other age-related diseases such as Alzheimer's disease and atherosclerosis. This suggests that similar pathways may be involved in the etiologies of AMD and other age-related diseases.[67]

Genetic testing[edit]

A practical application of AMD-associated genetic markers is in the prediction of progression of AMD from early stages of the disease to neovascularization.[68][69]

Stem cell transplant[edit]

Cell based therapies using bone marrow stem cells as well as Retinal pigment epithelial transplantation are being studied.[70] Recent advancements within the field of stem cell research in the United States have led to the first human embryonic stem cell trial for dry AMD, which reports positive results.[71]

Other types[edit]

There are a few other (rare) kinds of macular degeneration with similar symptoms but unrelated in etiology to Wet or Dry age-related macular degeneration. They are all genetic disorders that may occur in childhood or middle age.

  • Best's disease
  • Sorsby's fundus dystrophy is an autosomal dominant, retinal disease characterized by sudden acuity loss resulting from untreatable submacular neovascularisation
  • Stargardt's disease (juvenile macular degeneration, STGD) is an autosomal recessive retinal disorder characterized by a juvenile-onset macular dystrophy, alterations of the peripheral retina, and subretinal deposition of lipofuscin-like material.

Similar symptoms with a very different etiology and different treatment can be caused by epiretinal membrane or macular pucker or any other condition affecting the macula, such as central serous retinopathy.

Notable cases[edit]

See also[edit]

References[edit]

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