title: Scheimpflug imaging for laser refractive surgery.
abstract: OBJECTIVE
  To review the principles and clinical applications of Scheimpflug corneal and anterior segment imaging with special relevance for laser refractive surgery.
  
  
  RESULTS
  Computerized Scheimpflug imaging has been used for corneal and anterior segment tomography (CASTm) in different commercially available instruments. Such approach computes the three-dimensional image of the cornea and anterior segment, enabling the characterization of elevation and curvature of the front and back surfaces of the cornea, pachymetric mapping, calculation of the total corneal refractive power and anterior segment biometry. CASTm represents a major evolution for corneal and anterior segment analysis, beyond front surface corneal topography and single point central corneal thickness measurements. This approach enhances the diagnostic abilities for screening ectasia risk as well as for planning, evaluating the results, managing complications of refractive procedures, and selecting intraocular lens power, type, and design. In addition, dynamic Scheimpflug imaging has been recently introduced for in-vivo corneal biomechanical measurements and has also been used for anterior segment imaging of femtocataract surgery.
  
  
  CONCLUSIONS
  Scheimpflug imaging has an important role for laser refractive surgery with different applications, which continuously improve due to advances in technology.
authors.affiliation: Instituto de Olhos Renato Ambrósio & Visare-RIO-Rio de Janeiro, Brazil. dr.renatoambrosio@gmail.com
authors.forename: Renato
authors.initials: R
authors.lastname: Ambrósio
authors.forename: Bruno F
authors.initials: BF
authors.lastname: Valbon
authors.forename: Fernando
authors.initials: F
authors.lastname: Faria-Correia
authors.forename: Isaac
authors.initials: I
authors.lastname: Ramos
authors.forename: Allan
authors.initials: A
authors.lastname: Luz
mesh_terms: D000869:Anterior Eye Segment / Q000473:pathology*; D001699:Biometry; D048988:Corneal Surgery, Laser; D003941:Diagnostic Techniques, Ophthalmological; D006801:Humans; D010781:Photography / Q000379:methods*; D012029:Refraction, Ocular; D014054:Tomography