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      Image Analysis of Scheimpflug Negatives

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          Abstract

          Evaluation of various long-term studies on changes of different lens opacities, as had been rendered possible by microdensitometric image analysis of the film blackening of Scheimpflug photographs, showed that only in a few special cases an extension of the opacification to adjacent lens layers is to be expected within the observation period of 2–3 years. This means that one of the reasons for evaluating the densitometer curve by area planimetry is no longer valid and may be neglected. A further advantage of the measurement of film blackening by height evaluation (height of densitometer deflection above baseline, i.e., noise level) is the fact that it is highly independent of subjective factors and, therefore, ensures a far better reproducibility with respect to data acquisition. The results of both evaluation procedures, obtained by evaluating the identical film material (2 photoexaminations) of 14 volunteers, are presented, and the advantage of height measurement as opposed to planimetry is demonstrated.

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          Author and article information

          Journal
          ORE
          Ophthalmic Res
          10.1159/issn.0030-3747
          Ophthalmic Research
          S. Karger AG
          0030-3747
          1423-0259
          1988
          1988
          09 December 2009
          : 20
          : 2
          : 99-105
          Affiliations
          Abteilung für experimentelle Ophthalmologie, Medizinische Einrichtungen der Universität Bonn, BRD
          Article
          266258 Ophthalmic Res 1988;20:99–105
          10.1159/000266258
          3419788
          © 1988 S. Karger AG, Basel

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          Page count
          Pages: 7
          Categories
          Original Paper

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