{"id":47,"date":"2016-08-25T01:23:10","date_gmt":"2016-08-25T01:23:10","guid":{"rendered":"http:\/\/www.cataractcourse.com\/?page_id=47"},"modified":"2017-02-02T02:06:11","modified_gmt":"2017-02-02T02:06:11","slug":"cataracts","status":"publish","type":"page","link":"http:\/\/cataractcourse.com\/cataracts\/","title":{"rendered":"Types of cataracts"},"content":{"rendered":"<p style=\"text-align: center;\">The three most common types of cataracts in adults are nuclear, cortical, and posterior subcapsular cataracts. Congenital cataracts are a major cause of leukocoria in infants and can lead to vision loss and amblyopia if left untreated.<\/p>\n<h3 style=\"text-align: left;\"><span style=\"color: #09628f;\"><strong>Nuclear cataracts<\/strong><\/span><\/h3>\n<p style=\"text-align: left;\">Nuclear cataracts are the most common type.\u00a0These usually manifest with blurred vision, myopic shift, and loss of blue\/yellow color perception.\u00a0They are most commonly associated with increased age, but smoking, gender, and diet may also influence their development.<\/p>\n<figure id=\"attachment_476\" aria-describedby=\"caption-attachment-476\" style=\"width: 300px\" class=\"wp-caption alignright\"><img class=\"wp-image-476 size-medium\" src=\"http:\/\/cataractcourse.com\/wp-content\/uploads\/2016\/08\/Nuclear-sclerotic-AA0_51370-e1484013356265-300x191.jpg\" width=\"300\" height=\"191\" srcset=\"http:\/\/cataractcourse.com\/wp-content\/uploads\/2016\/08\/Nuclear-sclerotic-AA0_51370-e1484013356265-300x191.jpg 300w, http:\/\/cataractcourse.com\/wp-content\/uploads\/2016\/08\/Nuclear-sclerotic-AA0_51370-e1484013356265-423x270.jpg 423w, http:\/\/cataractcourse.com\/wp-content\/uploads\/2016\/08\/Nuclear-sclerotic-AA0_51370-e1484013356265.jpg 450w\" sizes=\"(max-width: 300px) 100vw, 300px\" \/><figcaption id=\"caption-attachment-476\" class=\"wp-caption-text\">Nuclear cataract<\/figcaption><\/figure>\n<p>Brunescent cataracts are very advanced nuclear cataracts that are opaque and brown.\u00a0Their increased density makes phacoemulsification very difficult and increases risk of complications. Morgagnian cataracts are a special case of hypermature cataract (see page on\u00a0<a href=\"http:\/\/cataractcourse.com\/cataracts-2\/grading-cataracts\/\">cataract grading<\/a>).<\/p>\n<p>&nbsp;<\/p>\n<h3><strong><span style=\"color: #09628f;\">Cortical cataracts<\/span><\/strong><\/h3>\n<p>Cortical cataracts are often wedge-shaped in appearance and located in the inferior or nasal aspect of the lens.<\/p>\n<p>Symptoms include glare and diminished reading capacity.\u00a0Risk factors include race (African Americans), diabetes, sunlight exposure, trauma, and smoking.<\/p>\n<figure id=\"attachment_485\" aria-describedby=\"caption-attachment-485\" style=\"width: 279px\" class=\"wp-caption alignright\"><img class=\"wp-image-485\" src=\"http:\/\/cataractcourse.com\/wp-content\/uploads\/2016\/08\/Lamellar-cataract-AA0_5008.jpg\" alt=\"lamellar-cataract-aa0_5008\" width=\"279\" height=\"216\" srcset=\"http:\/\/cataractcourse.com\/wp-content\/uploads\/2016\/08\/Lamellar-cataract-AA0_5008.jpg 713w, http:\/\/cataractcourse.com\/wp-content\/uploads\/2016\/08\/Lamellar-cataract-AA0_5008-300x233.jpg 300w\" sizes=\"(max-width: 279px) 100vw, 279px\" \/><figcaption id=\"caption-attachment-485\" class=\"wp-caption-text\">Lamellar cataract (opacity within the cortex only)<\/figcaption><\/figure>\n<figure id=\"attachment_481\" aria-describedby=\"caption-attachment-481\" style=\"width: 279px\" class=\"wp-caption alignleft\"><img class=\"wp-image-481\" src=\"http:\/\/cataractcourse.com\/wp-content\/uploads\/2016\/08\/Focal-cortical-panel-A-01.jpg\" alt=\"focal-cortical-panel-a-01\" width=\"279\" height=\"189\" srcset=\"http:\/\/cataractcourse.com\/wp-content\/uploads\/2016\/08\/Focal-cortical-panel-A-01.jpg 1091w, http:\/\/cataractcourse.com\/wp-content\/uploads\/2016\/08\/Focal-cortical-panel-A-01-300x203.jpg 300w, http:\/\/cataractcourse.com\/wp-content\/uploads\/2016\/08\/Focal-cortical-panel-A-01-768x521.jpg 768w, http:\/\/cataractcourse.com\/wp-content\/uploads\/2016\/08\/Focal-cortical-panel-A-01-1024x695.jpg 1024w\" sizes=\"(max-width: 279px) 100vw, 279px\" \/><figcaption id=\"caption-attachment-481\" class=\"wp-caption-text\">Cortical cataract<\/figcaption><\/figure>\n<figure id=\"attachment_480\" aria-describedby=\"caption-attachment-480\" style=\"width: 291px\" class=\"wp-caption aligncenter\"><img class=\"wp-image-480\" src=\"http:\/\/cataractcourse.com\/wp-content\/uploads\/2016\/08\/Focal-segmental-cataract-panel-B-01.jpg\" alt=\"focal-segmental-cataract-panel-b-01\" width=\"291\" height=\"197\" srcset=\"http:\/\/cataractcourse.com\/wp-content\/uploads\/2016\/08\/Focal-segmental-cataract-panel-B-01.jpg 1093w, http:\/\/cataractcourse.com\/wp-content\/uploads\/2016\/08\/Focal-segmental-cataract-panel-B-01-300x203.jpg 300w, http:\/\/cataractcourse.com\/wp-content\/uploads\/2016\/08\/Focal-segmental-cataract-panel-B-01-768x520.jpg 768w, http:\/\/cataractcourse.com\/wp-content\/uploads\/2016\/08\/Focal-segmental-cataract-panel-B-01-1024x693.jpg 1024w\" sizes=\"(max-width: 291px) 100vw, 291px\" \/><figcaption id=\"caption-attachment-480\" class=\"wp-caption-text\">A closer view of a wedge-shaped cortical cataract<\/figcaption><\/figure>\n<p>&nbsp;<\/p>\n<h3 style=\"text-align: justify;\"><strong><span style=\"color: #09628f;\">\u00a0<\/span><\/strong><span style=\"color: #09628f;\">Posterior subcapsular cataracts<\/span><\/h3>\n<figure id=\"attachment_236\" aria-describedby=\"caption-attachment-236\" style=\"width: 300px\" class=\"wp-caption alignleft\"><img class=\"wp-image-236 size-medium\" src=\"http:\/\/cataractcourse.com\/wp-content\/uploads\/2016\/08\/Posterior-Subcapsular-300x225.jpg\" alt=\"Posterior-Subcapsular\" width=\"300\" height=\"225\" \/><figcaption id=\"caption-attachment-236\" class=\"wp-caption-text\">Posterior subcapsular cataract<\/figcaption><\/figure>\n<p>Posterior subcapsular cataracts occur just inside the outer lens capsule.\u00a0These can be more rapidly symptomatic and may manifest with glare, diminished reading capacity and monocular diplopia. Younger patients are more likely to experience these cataracts than\u00a0nuclear or cortical cataracts.\u00a0Risk factors include glucocorticoid use, uveitis, retinitis pigmentosa, diabetes, radiation.<\/p>\n<h3><span style=\"color: #09628f;\">Congenital cataracts<br \/>\n<\/span><\/h3>\n<figure id=\"attachment_478\" aria-describedby=\"caption-attachment-478\" style=\"width: 345px\" class=\"wp-caption alignright\"><img class=\" wp-image-478\" src=\"http:\/\/cataractcourse.com\/wp-content\/uploads\/2016\/08\/Congenital-cataract-AA0_2108.jpg\" alt=\"T255 IM 6-2\" width=\"345\" height=\"230\" srcset=\"http:\/\/cataractcourse.com\/wp-content\/uploads\/2016\/08\/Congenital-cataract-AA0_2108.jpg 900w, http:\/\/cataractcourse.com\/wp-content\/uploads\/2016\/08\/Congenital-cataract-AA0_2108-300x200.jpg 300w, http:\/\/cataractcourse.com\/wp-content\/uploads\/2016\/08\/Congenital-cataract-AA0_2108-768x512.jpg 768w\" sizes=\"(max-width: 345px) 100vw, 345px\" \/><figcaption id=\"caption-attachment-478\" class=\"wp-caption-text\">Congenital cataract<\/figcaption><\/figure>\n<p>These cataracts are opacifications that appear within the first year after birth. Causes may be either\u00a0genetic, traumatic, or infectious.<\/p>\n<ul>\n<li>Any genetic mutations in crystalline structure can lead to cataracts.<\/li>\n<li>Other genetic conditions with increased risk of cataracts include familial congenital cataracts, galactosemia, Down syndrome, Pierre-Robin syndrome, Lowe syndrome, and Trisomy 13.<\/li>\n<li>Developmental insults that damage the nuclear or lenticular fibers can lead to total, polar (anterior and posterior), lamellar, zonular nuclear, or punctate cataracts depending on the region affected.<\/li>\n<li>Prenatal maternal infections such as rubella,\u00a0rubeola, cytomegalovirus (CMV), herpes simplex (HSV), herpes zoster, influenza, Epstein\u2013Barr virus (EBV), syphilis, and toxoplasmosis can lead to congenital cataracts.<\/li>\n<\/ul>\n<h4><span style=\"color: #09628f;\">Numerous systemic diseases are associated with increased risk of cataract development, often with distinct patterns.<\/span><\/h4>\n<ul>\n<li>Diabetes mellitus\n<figure id=\"attachment_482\" aria-describedby=\"caption-attachment-482\" style=\"width: 310px\" class=\"wp-caption alignright\"><img class=\"wp-image-482\" src=\"http:\/\/cataractcourse.com\/wp-content\/uploads\/2016\/08\/Diabetic-snowflake-cataract-AA0_53202.jpg\" alt=\"diabetic-snowflake-cataract-aa0_53202\" width=\"310\" height=\"234\" srcset=\"http:\/\/cataractcourse.com\/wp-content\/uploads\/2016\/08\/Diabetic-snowflake-cataract-AA0_53202.jpg 864w, http:\/\/cataractcourse.com\/wp-content\/uploads\/2016\/08\/Diabetic-snowflake-cataract-AA0_53202-300x227.jpg 300w, http:\/\/cataractcourse.com\/wp-content\/uploads\/2016\/08\/Diabetic-snowflake-cataract-AA0_53202-768x580.jpg 768w\" sizes=\"(max-width: 310px) 100vw, 310px\" \/><figcaption id=\"caption-attachment-482\" class=\"wp-caption-text\">Diabetic snowflake cataract<\/figcaption><\/figure>\n<ul>\n<li>Diabetes is associated with increased oxidative stress.<\/li>\n<li>Glycation of ion pumps in diabetes also leads to increased osmotic stress and cataract formation.<\/li>\n<\/ul>\n<\/li>\n<li>Myotonic dystrophy\n<ul>\n<li>Almost all myotonic dystrophy patients have cataracts.<\/li>\n<li>Early cataracts are called \u201c<a href=\"http:\/\/webeye.ophth.uiowa.edu\/eyeforum\/atlas\/pages\/christmas-tree-cataract.htm\"target=\"_blank\">Christmas tree<\/a>\u201d cataracts because of the bright, branching appearance of fine dust-like deposits in the posterior lens.<\/li>\n<li>Deposits eventually cloud the entire lens and form mature cataracts that may be indistinguishable from other etiologies.<\/li>\n<li>Mytonic dystrophy can also be associated with \u201cbulls-eye\u201d macular depigmentation.<\/li>\n<\/ul>\n<\/li>\n<li>Wilson\u2019s disease\n<ul>\n<li>An autosomal recessive disorder in which hepatic lysosomes are unable to store copper.\u00a0Labs show low serum ceruloplasmin, low serum copper, high liver copper levels, and high urinary copper.\u00a0The classic findings with Wilson\u2019s disease are Kayser-Fleischer rings due to copper accumulation at the edge of the cornea.<\/li>\n<li>About 20% of patients with neurological signs of Wilson\u2019s disease have \u201csunflower cataracts\u201d comprised of a multicolor central opacity in the anterior capsule surrounded by radial opacities in the lens cortex.<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<p>Certain medications increase risk of\u00a0cataract development.\u00a0Prolonged use of prednisone (often for one year or more) may induce cataracts, particularly subcapsular cataracts, that require surgical removal.\u00a0Miotics, chlorpromazine, allopurinol, chloroquine, and amiodarone can all also contribute to cataract formation.<\/p>\n<p>More\u00a0examples of cataracts associated with systemic conditions:<\/p>\n<figure id=\"attachment_484\" aria-describedby=\"caption-attachment-484\" style=\"width: 241px\" class=\"wp-caption alignleft\"><img class=\"wp-image-484\" src=\"http:\/\/cataractcourse.com\/wp-content\/uploads\/2016\/08\/Juvenille-idiopathic-arthritis-AA0_54388-1.jpg\" alt=\"juvenille-idiopathic-arthritis-aa0_54388\" width=\"241\" height=\"190\" srcset=\"http:\/\/cataractcourse.com\/wp-content\/uploads\/2016\/08\/Juvenille-idiopathic-arthritis-AA0_54388-1.jpg 900w, http:\/\/cataractcourse.com\/wp-content\/uploads\/2016\/08\/Juvenille-idiopathic-arthritis-AA0_54388-1-300x237.jpg 300w, http:\/\/cataractcourse.com\/wp-content\/uploads\/2016\/08\/Juvenille-idiopathic-arthritis-AA0_54388-1-768x606.jpg 768w\" sizes=\"(max-width: 241px) 100vw, 241px\" \/><figcaption id=\"caption-attachment-484\" class=\"wp-caption-text\">Juvenille idiopathic arthritis<\/figcaption><\/figure>\n<figure id=\"attachment_483\" aria-describedby=\"caption-attachment-483\" style=\"width: 286px\" class=\"wp-caption alignright\"><img class=\"wp-image-483\" src=\"http:\/\/cataractcourse.com\/wp-content\/uploads\/2016\/08\/Galactosemia-AA0_13251.jpg\" alt=\"galactosemia-aa0_13251\" width=\"286\" height=\"116\" srcset=\"http:\/\/cataractcourse.com\/wp-content\/uploads\/2016\/08\/Galactosemia-AA0_13251.jpg 1041w, http:\/\/cataractcourse.com\/wp-content\/uploads\/2016\/08\/Galactosemia-AA0_13251-300x121.jpg 300w, http:\/\/cataractcourse.com\/wp-content\/uploads\/2016\/08\/Galactosemia-AA0_13251-768x311.jpg 768w, http:\/\/cataractcourse.com\/wp-content\/uploads\/2016\/08\/Galactosemia-AA0_13251-1024x414.jpg 1024w\" sizes=\"(max-width: 286px) 100vw, 286px\" \/><figcaption id=\"caption-attachment-483\" class=\"wp-caption-text\">Galactosemia-associated cataract<\/figcaption><\/figure>\n<p>&nbsp;<\/p>\n<p>&nbsp;<\/p>\n<p>&nbsp;<\/p>\n<p>&nbsp;<\/p>\n<p>&nbsp;<\/p>\n<div id=\"textbox\">\n<p class=\"alignleft\"><a href=\"http:\/\/cataractcourse.com\/cataracts-2\/cataract-diagnosis\/\">Previous<\/a><\/p>\n<p class=\"alignright\"><a href=\"http:\/\/cataractcourse.com\/cataracts-2\/grading-cataracts\/\">Next<\/a><\/p>\n<\/div>\n","protected":false},"excerpt":{"rendered":"<p>The three most common types of cataracts in adults are nuclear, cortical, and posterior subcapsular cataracts. Congenital cataracts are a major cause of leukocoria in infants and can lead to vision loss and amblyopia if left untreated. Nuclear cataracts Nuclear cataracts are the most common type.\u00a0These usually manifest with blurred vision, myopic shift, and loss of blue\/yellow color perception.\u00a0They are most commonly associated with increased age, but smoking, gender, and diet may also influence their development. Brunescent cataracts are very&#8230;<\/p>\n<p class=\"read-more\"><a class=\"btn btn-default\" href=\"http:\/\/cataractcourse.com\/cataracts\/\"> Read More<span class=\"screen-reader-text\">  Read More<\/span><\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"parent":0,"menu_order":1,"comment_status":"closed","ping_status":"closed","template":"","meta":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v19.11 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>Types of cataracts - The Cataract Course<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/cataractcourse.com\/cataracts\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Types of cataracts - The Cataract Course\" \/>\n<meta property=\"og:description\" content=\"The three most common types of cataracts in adults are nuclear, cortical, and posterior subcapsular cataracts. Congenital cataracts are a major cause of leukocoria in infants and can lead to vision loss and amblyopia if left untreated. Nuclear cataracts Nuclear cataracts are the most common type.\u00a0These usually manifest with blurred vision, myopic shift, and loss of blue\/yellow color perception.\u00a0They are most commonly associated with increased age, but smoking, gender, and diet may also influence their development. Brunescent cataracts are very... 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Congenital cataracts are a major cause of leukocoria in infants and can lead to vision loss and amblyopia if left untreated. Nuclear cataracts Nuclear cataracts are the most common type.\u00a0These usually manifest with blurred vision, myopic shift, and loss of blue\/yellow color perception.\u00a0They are most commonly associated with increased age, but smoking, gender, and diet may also influence their development. Brunescent cataracts are very... 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