Macular degeneration

From Wikipedia, the free encyclopedia - View original article

Macular degeneration
Classification and external resources
Intermediate age related macular degeneration.jpg
Picture of the fundus showing intermediate age-related macular degeneration.
ICD-10H35.3
ICD-9362.50
DiseasesDB11948
MedlinePlus001000
eMedicinearticle/1223154
MeSHD008268
 
  (Redirected from Macular Degeneration)
Jump to: navigation, search
Macular degeneration
Classification and external resources
Intermediate age related macular degeneration.jpg
Picture of the fundus showing intermediate age-related macular degeneration.
ICD-10H35.3
ICD-9362.50
DiseasesDB11948
MedlinePlus001000
eMedicinearticle/1223154
MeSHD008268
Human eye cross-sectional view

Age-related macular degeneration (AMD) is a medical condition which usually affects older adults and results in a loss of vision in the center of the visual field (the macula) because of damage to the retina. It occurs in "dry" and "wet" forms. It is a major cause of blindness and visual impairment in older adults (>50 years). Macular degeneration can make it difficult or impossible to read or recognize faces, although enough peripheral vision remains to allow other activities of daily life.

Starting from the inside of the eye and going towards the outer surface, the three main layers at the back of the eye are the retina, which is light-sensitive tissue that is considered part of the central nervous system and is actually brain tissue; the choroid, which contains the blood supply; and the sclera, which is the white, outer, layer of the eye.

The macula is the central area of the retina, which provides the most detailed central vision.

In the dry (nonexudative) form, cellular debris called drusen accumulates between the retina and the choroid, and the retina can become detached. In the wet (exudative) form, which is more severe, blood vessels grow up from the choroid behind the retina, and the retina can also become detached. It can be treated with laser coagulation, and with medication that stops and sometimes reverses the growth of blood vessels.[1][2]

Although some macular dystrophies affecting younger individuals are sometimes referred to as macular degeneration, the term generally refers to age-related macular degeneration (AMD or ARMD).

Age-related macular degeneration begins with characteristic 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) have good vision. People with drusen can go on to develop advanced AMD. The risk 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 related to elevated cholesterol deposits and may respond to cholesterol-lowering agents.[citation needed]

Dry AMD[edit]

Central geographic atrophy, the "dry" form of advanced AMD, results from atrophy of the retinal pigment epithelial layer below the retina, which causes vision loss through loss of photoreceptors (rods and cones) in the central part of the eye. No medical or surgical treatment is available for this condition; however, vitamin supplements with high doses of antioxidants, lutein and zeaxanthin, have been suggested by the National Eye Institute and others to slow the progression of dry macular degeneration and, in some patients, improve visual acuity.[3] However, 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.[4]

Higher beta-carotene intake was associated with an increased risk of AMD.[3]

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, 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.

Only about 10% of patients suffering from macular degeneration have the wet type.[5]

Macular degeneration is not painful, which may allow it to go unnoticed for some time.[6]

Signs and symptoms[edit]

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

Signs and symptoms of macular degeneration include:

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. 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.[9] 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. Interestingly, 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.[10]

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.

There is a loss of contrast sensitivity, so that contours, shadows, and color vision are less vivid. The loss in contrast sensitivity can be quickly and easily measured by a contrast sensitivity test performed either at home or by an eye specialist.

Similar symptoms with a very different etiology and different treatment can be caused by epiretinal membrane or macular pucker or leaking blood vessels in the eye.

Causes and risk factors[edit]

Disability-adjusted life year for macular degeneration and other (sense organ diseases) per 100,000 inhabitants in 2004[11]
  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

Genetic testing[edit]

A practical application of AMD-associated markers is in the prediction of progression of AMD from early stages of the disease to neovascularization.[35][36]

Early work demonstrated a family of immune mediators was plentiful in drusen.[37] 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.[38][39][40][41][42] Thus an AMD pathophysiological model of chronic low grade complement activation and inflammation in the macula has been advanced.[43][44] 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).[45]

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.[46][47][48] Mitochondria are a major source of oxygen free radicals that occur as a byproduct of energy metabolism. Mitochondrial gene polymorphisms, such as that in the MT-ND2 molecule, predicts wet AMD.[49][50]

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.[51][52] 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. 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.[53][54]

Diagnosis[edit]

Super resolution microscopic investigation of human eye tissue affected by AMD

The major symptoms of macular degeneration:[55]

Fluorescein angiography allows for the identification and localization of abnormal vascular processes. Optical coherence tomography is now used by most ophthalmologists in the diagnosis and the follow-up evaluation of the response to treatment by using either bevacizumab (Avastin) or ranibizumab (Lucentis), which are injected into the vitreous humor of the eye at various intervals.

Recently, structured illumination light microscopy, using a specially designed super resolution microscope setup has been used to resolve the fluorescent distribution of small autofluorescent structures (lipofuscin granulae) in retinal pigment epithelium tissue sections.[56]

Management[edit]

Drugs approved for some variety of macular degeneration include ranibizumab and aflibercept (for wet AMD).

Treatments for wet AMD[edit]

The proliferation of abnormal blood vessels in the retina is stimulated by vascular endothelial growth factor (VEGF). Antiangiogenics or anti-VEGF agents can cause regression of the abnormal blood vessels and improve vision when injected directly into the vitreous humor of the eye. The injections must be repeated monthly or bimonthly. Several antiangiogenic drugs have been approved for use in the eye by the U.S. Food and Drug Administration and regulatory agencies in other countries.

The first angiogenesis inhibitor, a monoclonal antibody against VEGF-A, was bevacizumab, which is approved for use in cancer. Ranibizumab is a smaller fragment, Fab fragment, of the parent bevacizumab molecule specifically designed for eye injections. The cost of ranibizumab is approximately GB£742 per treatment in the United Kingdom.[57] Bevacizumab is packaged and used for cancer in larger doses than the doses used in the eye. It can be administered in smaller doses in the eye, off label, at a cost of less than one-tenth that of ranibizumab per treatment.[57] A recent randomised control trial found that bevacizumab and ranibizumab had similar efficacy, and reported no significant increase in adverse events with bevacizumab [58]

In the UK, NICE issued guidelines[59] for the treatment of wet AMD in the NHS. NICE only approved use of ranibizumab for wet AMD in the NHS in England. NHS hospitals and Primary Care Trusts in England are required to follow NICE guidance.

Other approved antiangiogenic drugs for the treatment of neo-vascular AMD include pegaptanib (Macugen) and aflibercept (Eylea).[60]

Photodynamic therapy has also been used to treat wet AMD.[61] The drug verteporfin is administered intravenously; light of the correct wavelength is then applied to the abnormal blood vessels. This activates the verteporfin and obliterates the vessels.

Nondrug interventions[edit]

Some evidence supports a reduction in the risk of AMD with increasing intake of two carotenoids, lutein and zeaxanthin.[62]

Consuming omega-3 fatty acids (docosahexaenoic acid and eicosapentaenoic acid) has been correlated with a reduced progression of early AMD, and in conjunction with low glycemic index foods, with reduced progression of advanced AMD.[63]

A Cochrane Database Review of publications to 2012 found the use of vitamin and mineral supplements, alone or in combination, by the general population had no effect on AMD,[64] a finding echoed by another review.[65] A 2006 Cochrane Review of the effects of vitamins and minerals on the slowing of AMD found the positive results mainly came from a single large trial in the United States (the Age-Related Eye Disease Study), with funding from the eye care product company Bausch & Lomb, which also manufactured the supplements used in the study,[66] and questioned the generalization of the data to any other populations with different nutritional status. The review also questioned the possible harm of such supplements, given the increased risk of lung cancer in smokers with high intakes of beta-carotene, and the increased risk of heart failure in at-risk populations who consume high levels of vitamin E supplements.[67] A Cochrane database review published in March 2012 did not find sufficient evidence to determine the effectiveness and safety of statins for the prevention or delaying the progression of AMD.[68]

Cell based therapies using bone marrow stem cells as well as Retinal pigment epithelial transplantation have been reported as experimental options in several patients.[69]

Biofeedback[edit]

A 2012 observational study by Pacella et al. found a significant improvement in both visual acuity and fixation treating patients suffering from age-related macular degeneration or macular myopic degeneration with biofeedback treatment through MP-1 microperimeter.[70][non-primary source needed]

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.[71] Assistance and resources are available in many countries and every state in the U.S.[72] 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.

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.

Amsler grid test[edit]

The Amsler grid test is one of the simplest and most effective methods for patients to monitor the health of their maculae. The Amsler grid is, in essence, a pattern of intersecting lines (identical to graph paper) with a black dot in the middle. The central black dot is used for fixation (a place for the eye to focus). With normal vision, all lines surrounding the black dot will look straight and evenly spaced, with no missing or odd-looking areas when fixating on the grid's central black dot. When disease is affecting the macula, as in macular degeneration, the lines can look bent, distorted and/or missing.[citation needed]

See also[edit]

References[edit]

  1. ^ de Jong PT (2006). "Age-related macular degeneration". N Engl J Med. 355 (14): 1474–1485. doi:10.1056/NEJMra062326. PMID 17021323. 
  2. ^ Ch. 25, Disorders of the Eye, Jonathan C. Horton, in Harrison's Principles of Internal Medicine, 16th ed.
  3. ^ a b Tan JS, Wang JJ, Flood V, Rochtchina E, Smith W, Mitchell P. (February 2008). "Dietary antioxidants and the long-term incidence of age-related macular degeneration: the Blue Mountain Eye Study". Ophthalmology. 115 (2): 334–41. doi:10.1016/j.ophtha.2007.03.083. PMID 17664009. 
  4. ^ Lanza, R; SD Schwartz (25 Feb 2012). "Embryonic stem cell trials for macular degeneration: a preliminary report.". Lancet. 
  5. ^ "Eye Conditions: Macular Degeneration". lasiksurgerycost.net. Retrieved 2011-02-18. 
  6. ^ "Age Related Macular Degeneration". visionenhancers.co.uk. 
  7. ^ [1][dead link]
  8. ^ "Preferential Hyperacuity Perimetry (PHP) as an Adjunct Diagnostic Tool to Funduscopy in Age–related Macular Degeneration - Ophthalmology Technology Spotlight". Medcompare. Retrieved 2011-01-11. 
  9. ^ Roberts, DL (September 2006). "The First Year--Age Related Macular Degeneration". (Marlowe & Company): 100. 
  10. ^ Roberts, DL (September 2006). "The First Year--Age Related Macular Degeneration". (Marlowe & Company): 20. 
  11. ^ "WHO Disease and injury country estimates". World Health Organization. 2009. Retrieved Nov 11, 2009. 
  12. ^ a b AgingEye Times (2009-05-19). "Macular Degeneration types and risk factors". Agingeye.net. Retrieved 2011-01-11. 
  13. ^ Hirschler, Ben (2008-10-07). "Gene discovery may help hunt for blindness cure". Reuters. Retrieved 2008-10-07. [dead link]
  14. ^ Yang Z, Camp NJ, Sun H, Tong Z, Gibbs D, Cameron DJ, Chen H, Zhao Y, Pearson E et al. (Nov 2006). "A variant of the HTRA1 gene increases susceptibility to age-related macular degeneration". Science 314 (5801): 992–3. doi:10.1126/science.1133811. PMID 17053109. 
  15. ^ Dewan A, Liu M, Hartman S, et al. (November 2006). "HTRA1 Promoter Polymorphism in Wet Age-Related Macular Degeneration". Science 314 (5801): 989–92. doi:10.1126/science.1133807. PMID 17053108. 
  16. ^ ""ABCR Gene and Age-Related Macular Degeneration " Science. 1998". Sciencemag.org. 1998-02-20. Retrieved 2011-01-11. 
  17. ^ Yates JR, Sepp T, Matharu BK, Khan JC, Thurlby DA, Shahid H, Clayton DG, Hayward C, Morgan J, Wright AF, Armbrecht AM, Dhillon B, Deary IJ, Redmond E, Bird AC, Moore AT (2007). "Complement C3 Variant and the Risk of Age-Related Macular Degeneration". N Engl J Med. 357 (6): 553–561. doi:10.1056/NEJMoa072618. PMID 17634448. 
  18. ^ Maller JB, Fagerness JA, Reynolds RC, Neale BM, Daly MJ, Seddon JM (2007). "Variation in Complement Factor 3 is Associated with Risk of Age-Related Macular Degeneration". Nature Genetics 39 (10): 1200–1201. doi:10.1038/ng2131. PMID 17767156. 
  19. ^ Dasari, Bhanu; Dasari B, Prasanthi JR, Marwarha G, Singh BB, Ghribi O. (18 August 2011). "Cholesterol-enriched diet causes age-related macular degeneration-like pathology in rabbit retina". BMC Ophthalmol. 11: 22. doi:10.1186/1471-2415-11-22. PMC 3170645. PMID 21851605. 
  20. ^ Adams MK, Simpson JA, Aung KZ, et al.; Adams MK, Simpson JA, Aung KZ, Makeyeva GA, Giles GG, English DR, Hopper J, Guymer RH, Baird PN, Robman LD. (1 June 2011). "Abdominal obesity and age-related macular degeneration". Am J Epidemiol. 173 (11): 1246–55. doi:10.1093/aje/kwr005. PMID 21422060. Retrieved 29 July 2012. 
  21. ^ Parekh N, Voland RP, Moeller SM, et al.; Parekh N, Voland RP, Moeller SM, Blodi BA, Ritenbaugh C, Chappell RJ, Wallace RB, Mares JA; CAREDS Research Study Group. (November 2009). "Association between dietary fat intake and age-related macular degeneration in the Carotenoids in Age-Related Eye Disease Study (CAREDS): an ancillary study of the Women's Health Initiative". Arch Ophthalmol. 127 (11): 1483–93. doi:10.1001/archophthalmol.2009.130. PMC 3144752. PMID 19901214. 
  22. ^ John Paul SanGiovanni, ScD; Emily Y. Chew, MD; Traci E. Clemons, PhD; Matthew D. Davis, MD; Frederick L. Ferris III, MD; Gary R. Gensler, MS; Natalie Kurinij, PhD; Anne S. Lindblad, PhD; Roy C. Milton, PhD; Johanna M. Seddon, MD; and Robert D. Sperduto, MD (May 5, 2007). "The Relationship of Dietary Lipid Intake and Age-Related Macular Degeneration in a Case-Control Study". Archives of Ophthalmology. 
  23. ^ "Melanin aggregation and polymerization: possible implications in age related macular degeneration." Ophthalmic Research, 2005; volume 37: pages 136-141.
  24. ^ John Lacey, "Harvard Medical signs agreement with Merck to develop potential therapy for macular degeneration", 23-May-2006
  25. ^ Age-Related Eye Disease Study Research Group (Dec 2000). "Risk Factors Associated with Age-Related Macular Degeneration: A Case-control Study in the Age-Related Eye Disease Study: Age-Related Eye Disease Study Report Number 3". Ophthalmology 107 (12): 2224–32. doi:10.1016/S0161-6420(00)00409-7. PMC 1470467. PMID 11097601. 
  26. ^ Clemons TE, Milton RC, Klein R, Seddon JM, Ferris FL (April 2005). "Risk Factors for the Incidence of Advanced Age-Related Macular Degeneration in the Age-Related Eye Disease Study (AREDS) AREDS Report No. 19". Ophthalmology 112 (4): 533–9. doi:10.1016/j.ophtha.2004.10.047. PMC 1513667. PMID 15808240. 
  27. ^ Khan, JC; Shahid H, Thurlby DA, Bradley M, Clayton DG, Moore AT, Bird AC, Yates JR, Genetic Factors in AMD Study (January 2006). "Age related macular degeneration and sun exposure, iris colour, and skin sensitivity to sunlight". The British Journal of Ophthalmology 90 (1): 29–32. doi:10.1136/bjo.2005.073825. PMC 1856929. PMID 16361662. 
  28. ^ Glazer-Hockstein, C; Dunaief JL (January 2006). "Could blue light-blocking lenses decrease the risk of age-related macular degeneration?". Retina 26 (1): 1–4. doi:10.1097/00006982-200601000-00001. PMID 16395131. 
  29. ^ Margrain, TH; Boulton M, Marshall J, Sliney DH (September 2004). "Do blue light filters confer protection against age-related macular degeneration?". Progress in Retinal and Eye Research 23 (5): 523–31. doi:10.1016/j.preteyeres.2004.05.001. PMID 15302349. 
  30. ^ Roberts, D (September 2005). "Artificial Lighting and the Blue Light Hazard". Macular Degeneration Support Online Library. http://www.mdsupport.org/library/hazard.html#blue. 
  31. ^ doi = 10.1001/archophthalmol.2011.48 |http://archopht.jamanetwork.com/article.aspx?articleid=427167
  32. ^ Eye. "Smoking and age-related macular degeneration: a review of association". Nature.com. Retrieved 2011-01-11. 
  33. ^ Hughes, Anne E; Orr, Nick; Esfandiary, Hossein; Diaz-Torres, Martha; Goodship, Timothy; Chakravarthy, Usha (2006). "A common CFH haplotype, with deletion of CFHR1 and CFHR3, is associated with lower risk of age-related macular degeneration". Nature Genetics 38 (10): 1173–1177. doi:10.1038/ng1890. PMID 16998489. 
  34. ^ Fritsche, L. G.; Lauer, N.; Hartmann, A.; Stippa, S.; Keilhauer, C. N.; Oppermann, M.; Pandey, M. K.; Kohl, J. et al. (2010). "An imbalance of human complement regulatory proteins CFHR1, CFHR3 and factor H influences risk for age-related macular degeneration (AMD)". Human Molecular Genetics 19 (23): 4694–4704. doi:10.1093/hmg/ddq399. PMID 20843825. 
  35. ^ Chen W, Stambolian D, Edwards AO, Branham KE, Othman M, Jakobsdottir J (2010). "Genetic variants near TIMP3 and high-density lipoprotein–associated loci influence susceptibility to age-related macular degeneration". Proc Natl Acad Sci U S A 107 (16): 7401–7406. doi:10.1073/pnas.0912702107. PMC 2867722. PMID 20385819. 
  36. ^ Neale BM, Fagerness J, Reynolds R, Sobrin L, Parker M, Raychaudhuri S (2010). "Genome-wide association study of advanced age-related macular degeneration identifies a role of the hepatic lipase gene (LIPC)". Proc Natl Acad Sci U S A 107 (16): 7395–7400. doi:10.1073/pnas.0912019107. PMC 2867697. PMID 20385826. 
  37. ^ Mullins RF, Russell SR, Anderson DH, Hageman GS (2000). "Drusen associated with aging and age-related macular degeneration contain proteins common to extracellular deposits associated with atherosclerosis, elastosis, amyloidosis, and dense deposit disease". FASEB J 14 (7): 835–46. PMID 10783137. 
  38. ^ Hageman GS, Anderson DH, Johnson LV, Hancox LS, Taiber AJ, Hardisty LI (2005). "A common haplotype in the complement regulatory gene factor H (HF1/CFH) predisposes individuals to age-related macular degeneration". Proc Natl Acad Sci USA 102 (20): 7227–32. doi:10.1073/pnas.0501536102. PMC 1088171. PMID 15870199. 
  39. ^ Chen LJ, Liu DT, Tam PO, Chan WM, Liu K, Chong KK (2006). "Association of complement factor H polymorphisms with exudative age-related macular degeneration". Mol. Vis 12: 1536–42. PMID 17167412. 
  40. ^ Despriet DD, Klaver CC, Witteman JC, Bergen AA, Kardys I, de Maat MP (2006). "Complement factor H polymorphism, complement activators, and risk of age-related macular degeneration". JAMA 296 (3): 301–9. doi:10.1001/jama.296.3.301. PMID 16849663. 
  41. ^ Li M, Tmaca-Sonmez P, Othman M, Branham KE, Khanna R, Wade MS (2006). "CFH haplotypes without the Y402H coding variant show strong association with susceptibility to age-related macular degeneration". Nature Genetics 38 (9): 1049–54. doi:10.1038/ng1871. PMC 1941700. PMID 16936733. 
  42. ^ Haines JL, Hauser MA, Schmidt S, Scott WK, Olson LM, Gallins P (2005). "Complement factor H variant increases the risk of age-related macular degeneration". Science 308 (5720): 419–21. doi:10.1126/science.1110359. PMID 15761120. 
  43. ^ Rohrer B, Long Q, Coughlin B, Renner B, Huang Y, Kunchithapautham K (2010). "A targeted inhibitor of the complement alternative pathway reduces RPE injury and angiogenesis in models of age-related macular degeneration". Adv Exp Med Biol. Advances in Experimental Medicine and Biology 703: 137–49. doi:10.1007/978-1-4419-5635-4_10. ISBN 978-1-4419-5634-7. PMID 20711712. 
  44. ^ Kunchithapautham K, Rohrer B (May 2011). "Sublytic Membrane-Attack-Complex (MAC) Activation Alters Regulated Rather than Constitutive Vascular Endothelial Growth Factor (VEGF) Secretion in Retinal Pigment Epithelium Monolayers". J Biol Chem 286 (27): 23717–23724. doi:10.1074/jbc.M110.214593. PMC 3129152. PMID 21566137. 
  45. ^ Yates JR, Sepp T, Matharu BK, Khan JC, Thurlby DA, Shahid H (2007). "Complement C3 variant and the risk of age-related macular degeneration". NEJM 357 (6): 553–61. doi:10.1056/NEJMoa072618. PMID 17634448. 
  46. ^ ^ Thornton J, Edwards R, Mitchell P, Harrison RA, Buchan I, Kelly SP (2005). "Smoking and age-related macular degeneration: a review of association". Eye 19 (9): 935–44. doi:10.1038/sj.eye.6701978. PMID 16151432. 
  47. ^ Tomany SC, Cruickshanks KJ, Klein R, Klein BE, Knudtson MD (2004). "Sunlight and the 10-year incidence of age-related maculopathy: the Beaver Dam Eye Study". Arch Ophthalmol 122 (5): 750–7. doi:10.1001/archopht.122.5.750. PMID 15136324. 
  48. ^ Szaflik JP, Janik-Papis K, Synowiec E, Ksiazek D, Zaras M, Wozniak K (2009). "DNA damage and repair in age-related macular degeneration". Mutat Res 669 (1–2): 167–176. 
  49. ^ Udar N, Atilano SR, Memarzadeh M, Boyer D, Chwa M, Lu S (2009). "Mitochondrial DNA Haplogroups Associated with Age-Related Macular Degeneration". Invest Ophthalmol Vis Sci 50 (6): 2966–74. doi:10.1167/iovs.08-2646. PMID 19151382. 
  50. ^ Canter JA, Olson LM, Spencer K, Schnetz-Boutaud N, Anderson B, Hauser MA (2008). "Mitochondrial DNA polymorphism A4917G is independently associated with age-related macular degeneration". In Nicholas Weedon, Michael. PLoS ONE 3 (5): e2091. doi:10.1371/journal.pone.0002091. PMC 2330085. PMID 18461138. 
  51. ^ Fritsche LG, Loenhardt T, Janssen A, Fisher SA, Rivera A, Keilhauer CN (2008). "Age-related macular degeneration is associated with an unstable ARMS2 (LOC387715) mRNA DNA damage and repair in age-related macular degeneration". NatGenet 40 (7): 892–896. 
  52. ^ "Linkage analysis for age-related macular degeneration supports a gene on chromosome 10q26". Mol Vis 26 (10): 57–61. 2004.  Unknown parameter |unused_data= ignored (help)
  53. ^ Chen W, Stambolian D, Edwards AO, Branham KE, Othman M, Jakobsdottir J (2010). "Genetic variants near TIMP3 and high-density lipoprotein–associated loci influence susceptibility to age-related macular degeneration". Proc Natl Acad Sci U S A 107 (16): 7401–6. doi:10.1073/pnas.0912702107. PMC 2867722. PMID 20385819. 
  54. ^ Neale BM, Fagerness J, Reynolds R, Sobrin L, Parker M, Raychaudhuri S (2010). "Genome-wide association study of advanced age-related macular degeneration identifies a role of the hepatic lipase gene (LIPC)". Proc Natl Acad Sci U S A. 107 (16): 7395–400. doi:10.1073/pnas.0912019107. PMC 2867697. PMID 20385826. 
  55. ^ "Macular Degeneration Frequently Asked Questions". Retrieved December 11, 2013. 
  56. ^ Best G, Amberger R, Baddeley D, Ach T, Dithmar S, Heintzmann R and Cremer C (2011). Structured illumination microscopy of autofluorescent aggregations in human tissue. Micron, 42, 330-335 doi:10.1016/j.micron.2010.06.016
  57. ^ a b Copley, Caroline; Hirschler, Ben (April 24, 2012). "Novartis challenges UK Avastin use in eye disease". Reuters. 
  58. ^ Chakravarthy, U; Harding, SP; Rogers, CA; Downes, SM; Lotery, AJ; Culliford, LA; Reeves, BC; on behalf of the IVAN study, investigators (Jul 18, 2013). "Alternative treatments to inhibit VEGF in age-related choroidal neovascularisation: 2-year findings of the IVAN randomised controlled trial.". Lancet. PMID 23870813. 
  59. ^ NICE guidelines
  60. ^ FDA approves Eylea for macular degeneration
  61. ^ "Clinical effectiveness and cost–utility of photodynamic therapy for wet age-related macular degeneration: a systematic review and economic evaluation". Health Technology Assessment 7 (9). 2003. 
  62. ^ Carpentier S, Knaus M, Suh M (2009). "Associations between lutein, zeaxanthin, and age-related macular degeneration: An overview". Critical reviews in Food Science and Nutrition 49 (4): 313–326. doi:10.1080/10408390802066979. PMID 19234943. "Abstract doesn't include conclusion" 
  63. ^ Chiu CJ, Klein R, Milton RC, Gensler G, Taylor A (June 2009). "Does eating particular diets alter the risk of age-related macular degeneration in users of the Age-Related Eye Disease Study supplements?". Br J Ophthalmol 93 (9): 1241–6. doi:10.1136/bjo.2008.143412. PMC 3033729. PMID 19508997. "Conclusions: The findings show an association of consuming a diet rich in DHA with a lower progression of early AMD. In addition to the AREDS supplement, a lower dGI with higher intakes of DHA and EPA was associated with a reduced progression to advanced AMD." 
  64. ^ Evans JR, Lawrenson JG (2012). "Antioxidant vitamin and mineral supplements for preventing age-related macular degeneration". In Evans, Jennifer R. Cochrane Database Syst Rev 6: CD000253. doi:10.1002/14651858.CD000253.pub3. PMID 22696317. 
  65. ^ Evans J (June 2008). "Antioxidant supplements to prevent or slow down the progression of AMD: a systematic review and meta-analysis". Eye 22 (6): 751–60. doi:10.1038/eye.2008.100. PMID 18425071. 
  66. ^ SanGiovanni, JP (2009-01-21). "Age-Related Eye Disease Study (AREDS)". ClinicalTrials.gov. Retrieved 2009-06-24. 
  67. ^ Evans JR; Evans, Jennifer R (2006). "Antioxidant vitamin and mineral supplements for slowing the progression of age-related macular degeneration". In Evans, Jennifer R. Cochrane Database Syst Rev (2): CD000254. doi:10.1002/14651858.CD000254.pub2. PMID 16625532. 
  68. ^ Gehlbach P, Li T, Hatef E (2012). "Statins for age-related macular degeneration". In Cochrane Eyes and Vision Group. Cochrane Database Syst Rev 3: CD006927. doi:10.1002/14651858.CD006927.pub3. PMID 22419318. 
  69. ^ John S. et al (2013). "Choice of cell source in cell based therapies for retinal damage due to age related macular degeneration (AMD): A review". Journal of Ophthalmology 2013: 1. doi:10.1155/2013/465169. 
  70. ^ Pacella, E; Pacella, F; Mazzeo, F; Turchetti, P; Carlesimo, SC; Cerutti, F; Lenzi, T; De Paolis, G et al. (November 2012). "Effectiveness of vision rehabilitation treatment through MP-1 microperimeter in patients with visual loss due to macular disease". Clin Ter 163 (6): 163(6):e423–8. PMID 23306757.  Unknown parameter |firs3t= ignored (help);
  71. ^ "Low Vision Rehabilitation Delivery Model". Mdsupport.org. Retrieved 2011-01-11. 
  72. ^ "Agencies, Centers, Organizations, & Societies". Mdsupport.org. 2005-09-01. Retrieved 2011-01-11. 

See also[edit]

External links[edit]