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- Vertex_distance abstract "Vertex distance is the distance between the back surface of a corrective lens, i.e. glasses (spectacles) or contact lenses, and the front of the cornea. Increasing or decreasing the vertex distance changes the optical properties of the system, by moving the focal point forward or backward, effectively changing the power of the lens relative to the eye. Since most refractions are performed at a vertex distance of 14 mm, the power of a corrective device fitted at a different vertex distance may need to be compensated to effect the same correction of the initial refraction (note: refraction is portion of an eye exam that is performed with a phoropter).Vertex distance is important when converting between contact lens and glasses prescriptions and becomes significant if the glasses prescription is +/-4.00D or more. The focal point of the correcting lens needs to be at the far point of the eye. The formula for vertex correction is Fc=F/(1-xF), where Fc is the power corrected for vertex distance, F is the original lens power, and x is the change in vertex distance in meters.".
- Vertex_distance wikiPageID "15187217".
- Vertex_distance wikiPageLength "1614".
- Vertex_distance wikiPageOutDegree "9".
- Vertex_distance wikiPageRevisionID "669227372".
- Vertex_distance wikiPageWikiLink Category:Optics.
- Vertex_distance wikiPageWikiLink Contact_lens.
- Vertex_distance wikiPageWikiLink Cornea.
- Vertex_distance wikiPageWikiLink Dioptre.
- Vertex_distance wikiPageWikiLink Eye_examination.
- Vertex_distance wikiPageWikiLink Focus_(optics).
- Vertex_distance wikiPageWikiLink Glasses.
- Vertex_distance wikiPageWikiLink Human_eye.
- Vertex_distance wikiPageWikiLink Phoropter.
- Vertex_distance wikiPageWikiLinkText "Vertex distance".
- Vertex_distance wikiPageWikiLinkText "vertex distance".
- Vertex_distance wikiPageUsesTemplate Template:Eye-stub.
- Vertex_distance wikiPageUsesTemplate Template:Optics-stub.
- Vertex_distance wikiPageUsesTemplate Template:Reflist.
- Vertex_distance subject Category:Optics.
- Vertex_distance hypernym Distance.
- Vertex_distance type Agent.
- Vertex_distance type Science.
- Vertex_distance comment "Vertex distance is the distance between the back surface of a corrective lens, i.e. glasses (spectacles) or contact lenses, and the front of the cornea. Increasing or decreasing the vertex distance changes the optical properties of the system, by moving the focal point forward or backward, effectively changing the power of the lens relative to the eye.".
- Vertex_distance label "Vertex distance".
- Vertex_distance sameAs Q7922774.
- Vertex_distance sameAs m.03hl8tw.
- Vertex_distance sameAs Cornea_Vertex_Distance.
- Vertex_distance sameAs Q7922774.
- Vertex_distance wasDerivedFrom Vertex_distance?oldid=669227372.
- Vertex_distance isPrimaryTopicOf Vertex_distance.