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TitreIs keratoconus a real ectasia: analysis of corneal surface area in normal eyes and keratoconus ?
ButTo compare anterior and posterior corneal surface areas in normal cornea and keratoconus.
To correlate corneal surface area to corneal biometric values (white to white, maximal keratometry)
MéthodesWe retrospectively analyzed 12 587 elevation maps from 8162 eyes and 7003 maps from 2041 keratoconus. Elevation maps were acquired by Orbscan II. Corneal surface areas were calculated using digital elevation model and extrapolation to real corneal diameter.
RésultatsAnterior and posterior surface areas and corneal diameter are larger in keratoconus. Surface areas are directly correlated to corneal diameter. Maximal keratometry is inversely proportional to corneal diameter.
In normal eyes, anterior and posterior surface areas are inversely correlated to maximal keratometry. In keratoconus, corneal surface areas don’t increase with maximal keratometry.
ConclusionKeratoconus should not be considered as a real ectasia but greater as an isometric deformation with a central steepening and a peripheral flattening.
Conflit d'intérêtNon
Auteur 1
NomCRAHAY
InitialesF-X
InstitutCHR Citadelle
VilleLiège
Auteur 2
NomDebellemaniere
InitialesG
InstitutFondation Ophtalmologique Adolphe de Rothschild
VilleParis
Auteur 3
NomGhazal
InitialesW
InstitutFondation Ophtalmologique Adolphe de Rothschild
VilleParis
Auteur 4
NomTobalem
InitialesS
InstitutFondation Ophtalmologique Adolphe de Rothschild
VilleParis
Auteur 5
NomMorant
InitialesS
InstitutFondation Ophtalmologique Adolphe de Rothschild
VilleParis
Auteur 6
NomRampat
InitialesR
InstitutFondation Ophtalmologique Adolphe de Rothschild
Villeparis
Auteur 7
NomGatinel
InitialesD
InstitutFondation Ophtalmologique Adolphe de Rothschild
VilleParis
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