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Scheimpflug analysis in an epidemiological study
Author(s) -
Wegener A.
Publication year - 2015
Publication title -
acta ophthalmologica
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.534
H-Index - 87
eISSN - 1755-3768
pISSN - 1755-375X
DOI - 10.1111/j.1755-3768.2015.0231
Subject(s) - scheimpflug principle , cataracts , lens (geology) , optical coherence tomography , optics , ophthalmology , coherence (philosophical gambling strategy) , medicine , optometry , physics , cornea , quantum mechanics
Summary Radiation cataract enhances age‐related scattering increase. Radiation induces formation of subcapsular and cortical cataracts. Light scattering changes in lens layers evidences radiation damage to lens proteins. Scheimpflug imaging today offers standardized recording procedures minimizing the operator influence. The initial disadvantage of Scheimpflug imaging of only a few optical sections, has been overcome by the number of images recorded by the Pentacam ® (25/50 images/eye). Densitometric and biometric image analysis needs a 3D data localization in the lens. This type of image analysis has been proven suitable for nuclear and cortical cataracts. Subcapsular cataracts pose more problems because of their 2D extension. Scheimpflug imaging with 50 images per eye partly compensates this, but retroillumination imaging can be superior in this case. OCT has been developed for imaging of the retina, but is now also used for the anterior eye segment. However, in radiation cataract and epidemiological studies, this technique is not useful, because optical coherence tomography detects coherence shifts at interfaces not particle related light scattering. It detects clearly shaped cataracts, but not changes in lens light scattering.