{"id":541,"date":"2022-02-03T07:45:45","date_gmt":"2022-02-03T07:45:45","guid":{"rendered":"https:\/\/www.ojaseyehospital.com\/blog\/?p=541"},"modified":"2022-02-03T07:46:17","modified_gmt":"2022-02-03T07:46:17","slug":"what-is-corneal-topography","status":"publish","type":"post","link":"https:\/\/www.ojaseyehospital.com\/blog\/what-is-corneal-topography\/","title":{"rendered":"Corneal Mapping"},"content":{"rendered":"\n<h2>Corneal Mapping  (Corneal Topography)<\/h2>\n <p> Corneal topography is  an advanced device used by ophthalmologists to produce detailed images of the  shape, curvature and thickness of their patients. These images give  ophthalmologists excellent information about the condition of the corneal  surface.<\/p>\n  <h2>Different Types Of  Corneal Topography<\/h2>\n<ul class=\"list-style\">\n  <li><strong>Placido disc topography:<\/strong> Placido disc reflection systems measure curvature,  irregularities and the quality of the tear film and the outer bodies and other  parts of the anterior cornea.<\/li>\n  <li><strong>Scheimpflug and scanning-slit topography: <\/strong>They provide  information about the anterior and posterior surface of the cornea, its shape and  also give detailed information about the corneal thickness.<\/li>\n<\/ul>\n<h2>Different Maps Obtained  Through Corneal Topography<\/h2>\n  <p>The ophthalmologists  may obtain the following maps through corneal topography:<\/p>\n<ul class=\"list-style\">\n  <li><strong>Axial Display Map:<\/strong> It is a standard mapping system and is not very accurate. Axial maps  are a handy tool for selecting a primary curve for a soft contact lens due to  displaying of average bending angle.<\/li>\n  <li><strong>Tangential Demonstration Map:<\/strong> They provide very accurate results for measuring the accurate  shape and curvature of the cornea and are, therefore, useful for the application  of contact lenses, especially ortho-k lenses. This map is also helpful in  measuring contact lens power while the lens is in the eye. It helps the patient  wear a multifocal contact lens to obtain appropriate visual acuity. They are ready  to detect changes in corneal curvature that may occur due to corneal  distortions due to contact lenses.<\/li>\n  <li><strong>Elevation map:<\/strong> This map helps determine the cornea&#8217;s actual condition and aids in  selecting the best contact lens design for a person. The map display is very  useful when deciding between scleral gas permeable lenses (GP) or a contact  lens. Elevation mapping is also helpful in ortho-k management, as the shape of  the angle is vital in determining whether ortho-k lenses will fit a patient and  in choosing a double-axis or single-axis lens.<\/li>\n  <li><strong>Corneal thickness map:<\/strong> This map display is used to locate ocular diseases,  such as keratoconus, but they help monitor changes in corneal thickness during  contact lens contact.<\/li>\n  <li><strong>Tear-splitting indicator ( Tear Break Up time ) :<\/strong> This map shows the  quality of the natural tear film and shows how the quality of the tears is  affected by the wearing of a contact lens. It helps to measure the tear film  before the patient wears contact lenses. They were then compared with the  measurements taken after the patient wore contact lenses.<\/li>\n<\/ul>\n<h2>Purpose Of Corneal  Mapping<\/h2>\n<p>Corneal mapping is used to diagnose,  and monitor various eye conditions. The doctor uses this before advising of contact  lenses and while planning for surgeries such as laser vision correction. The  eye doctor utilizes corneal topography maps in conjunction with other tools  regarding laser vision correction. It precisely determines how much corneal  tissue needs to be removed to correct the patient&#8217;s vision.<\/p>\n  <h2>Advantages Of Corneal  Mapping<\/h2>\n <p> One of the advantages of corneal topography is that it can detect  abnormal conditions (minute changes in corneal shape ) that are not detectable  in a routine examination.<\/p>\n <p> Corneal topography provides a detailed, visual description of the shape of  the cornea. The doctor uses this information to diagnose, monitor, and treat  various eye conditions. The doctor also implements corneal topography in prescribing  contact lenses and surgical planning, including laser correction. <\/p>\n\n<h2>Differences Between Corneal  Topography And Corneal Tomography<\/h2>\n  <p>Following are some of the  differences between topography and tomography:<\/p>\n<ul class=\"list-style\">\n  <li><strong>Corneal topography<\/strong> is a non-invasive method of mapping the upper extremities and the shape  of the anterior corneal surface. It is performed using a Placido disc that  examines the cornea based on the reflection of fixed rings. The devices used  are Orbscan, Atlas, and NIDEK OPD.<\/li>\n  <li><strong>Corneal tomography<\/strong> makes 3D images of the cornea and examines the entire cornea from  posterior and anterior regions. It is done using scheimpflug imaging that looks  at the cornea using two cameras that images the cornea 360 degree as it  rotates. Devices used are Pentacam, Galilei, and Sirius. This images both the  front and back surfaces of the cornea hence gives more information about the  corneal shape. Pentacam HR is a gold standard device.<\/li>\n<\/ul>\n<h2>Performance Of Corneal  Topography<\/h2>\n <p> You are asked to sit in front of a lighted round  device containing a ring pattern and rest your head against the head rest. A  series of data points will be collected, and a colourful image of your cornea  shape will be displayed on a computer screen. The images will contain various  colours to differentiate the height, similar to a map.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Corneal topography is an advanced device used by ophthalmologists to produce detailed images of the shape, curvature and thickness of their patients. These images give ophthalmologists excellent information about the condition of the corneal surface.<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[328],"tags":[329,330],"class_list":["post-541","post","type-post","status-publish","format-standard","hentry","category-corneal-mapping","tag-corneal-mapping","tag-corneal-topography"],"aioseo_notices":[],"aioseo_head":"\n\t\t<!-- All in One SEO 4.9.10 - aioseo.com -->\n\t<meta name=\"description\" content=\"Corneal topography is an advanced device used by ophthalmologists to produce detailed images of the shape, curvature and thickness of their patients.\" \/>\n\t<meta name=\"robots\" content=\"max-image-preview:large\" \/>\n\t<meta name=\"author\" content=\"admin\"\/>\n\t<link rel=\"canonical\" href=\"https:\/\/www.ojaseyehospital.com\/blog\/what-is-corneal-topography\/\" \/>\n\t<meta name=\"generator\" content=\"All in One SEO (AIOSEO) 4.9.10\" \/>\n\t\t<meta property=\"og:locale\" content=\"en_US\" \/>\n\t\t<meta property=\"og:site_name\" content=\"Ojas - 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