{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,3,31]],"date-time":"2026-03-31T16:18:29Z","timestamp":1774973909389,"version":"3.50.1"},"reference-count":56,"publisher":"Wiley","issue":"5","license":[{"start":{"date-parts":[[2009,5,1]],"date-time":"2009-05-01T00:00:00Z","timestamp":1241136000000},"content-version":"vor","delay-in-days":0,"URL":"http:\/\/onlinelibrary.wiley.com\/termsAndConditions#vor"},{"start":{"date-parts":[[2009,5,1]],"date-time":"2009-05-01T00:00:00Z","timestamp":1241136000000},"content-version":"tdm","delay-in-days":0,"URL":"http:\/\/doi.wiley.com\/10.1002\/tdm_license_1.1"}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["OVS"],"published-print":{"date-parts":[[2009,5]]},"abstract":"<jats:title>ABSTRACT<\/jats:title>\n                  <jats:sec>\n                    <jats:title>Purpose.<\/jats:title>\n                    <jats:p>Assessment of the relative performance in measuring corneal shape and corneal aberrations for two specular reflection topographers: Keratron Placido Ring Topographer, VU Topographer, and two slit\u2010lamp imaging instruments: Orbscan II and Topcon SL\u201045 Scheimpflug.<\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec>\n                    <jats:title>Methods.<\/jats:title>\n                    <jats:p>Corneal height maps of the anterior corneal surface were obtained from a group of 34 subjects with all four instruments; posterior corneal surface height maps were only obtained with the two slit\u2010lamp imaging instruments. Corneal surface shapes are calculated in terms of radius of curvature and asphericity fitting an aspheric model. Wave aberrations for the anterior corneal surface and the total cornea are determined up to and including sixth order Zernike convention by means of ray tracing.<\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec>\n                    <jats:title>Results.<\/jats:title>\n                    <jats:p>Clinical relevant differences were observed for radius of curvature of the anterior corneal surface, where the slit\u2010imaging instruments measure higher values (mean difference = 0.05 mm, p &lt; 0.05) and anterior corneal astigmatism for which the Orbscan II measures higher values than the VU Topographer [mean difference = 0.174 \u03bcm (0.134 Equivalent Diopters), p &lt; 0.01]. Small significant differences were observed for asphericity and spherical aberration of the anterior corneal surface; however, these are not clinically relevant. Clinically relevant differences were also observed for posterior radius (difference = 0.135 mm p &lt; 0.001), total corneal astigmatism (difference = 0.207 \u03bcm (0.159 Equivalent Diopters), p = 0.001), and central corneal thickness (CCT) (difference = \u221218.6 \u03bcm, p &lt; 0.001). The differences found for total corneal coma and trefoil were not clinical relevant. Furthermore, the precision of the specular reflection topographers is superior to that of the slit\u2010lamp instruments by at least a factor of two.<\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec>\n                    <jats:title>Conclusions.<\/jats:title>\n                    <jats:p>For traditional spectacle and contact lens applications, the corneal topographers are interchangeable except for measuring anterior radius of curvature. However, for more modern techniques as customized corneal refractive surgery, the subtle differences (e.g., total corneal astigmatism and CCT) between the instruments are clinically relevant.<\/jats:p>\n                  <\/jats:sec>","DOI":"10.1097\/opx.0b013e31819fa6f9","type":"journal-article","created":{"date-parts":[[2009,5,21]],"date-time":"2009-05-21T16:18:35Z","timestamp":1242922715000},"page":"467-475","source":"Crossref","is-referenced-by-count":9,"title":["Performance in Specular Reflection and Slit\u2010Imaging Corneal Topography"],"prefix":"10.1002","volume":"86","author":[{"given":"Boy","family":"Braaf","sequence":"first","affiliation":[{"name":"Rotterdam Ophthalmic Institute (ROI) The Rotterdam Eye Hospital Rotterdam The Netherlands"},{"name":"Department of Physics and Astronomy Physics of Complex Systems VU University Amsterdam The Netherlands"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Michiel","family":"Dubbelman","sequence":"additional","affiliation":[{"name":"Department of Physics and Medical Technology (FMT) VU University Medical Center Amsterdam The Netherlands"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Rob G. L.","family":"van der Heijde","sequence":"additional","affiliation":[{"name":"Department of Physics and Medical Technology (FMT) VU University Medical Center Amsterdam The Netherlands"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Victor Arni D. 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