P 264High frequence sonography for complicated surgery of the lens
Background: Since some years high frequence sonography is used for non invasive diagnostic of the anterior eye segment. We examined the potential of high frequence sonography (20MHz) for the management of cataract surgery in complicated cases.
Methods: For this study we used the I3 sonography instrument (Innovative Imaging Inc., Sacramento, USA). We examined 18 eyes. Indications for examination were: luxation of the lens, luxation of haptic after IOL-Implantation, trauma, nanophthalmus. We examined the capsular bag, zonula and position of the haptic in relation to the ciliary body.
Results: By means of high frequence sonography position of subluxated lens or IOL can be detected even if the visability of the anterior chamber is reduced.The position in relation to iris, ciliary body or anterior vitreous membrane can be shown. The continuity of lens capsule can be demonstrated. The examination of the zonula of the lens is possible.
Discussion: Examination of the capsule of the lens, zonula or ciliary body is difficult or impossible by means of 10MHz sonography. Here high frequence sonography gives complementary informations for the planning of surgery. In comparison with ultrasound biomicroscopy (50MHz) an advantage of 20MHz sonography is the greater amount of depth.
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