Paul Rolf Preussner

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PURPOSE To compare measured and calculated postoperative anterior chamber depths (ACDs). SETTING Department of Ophthalmology and Institute of Medical Physics, University of Vienna, Vienna, Austria, and Department of Ophthalmology, University of Mainz, Mainz, Germany. METHODS The postoperative ACD was measured in 189 pseudophakic eyes using a laboratory(More)
PURPOSE To describe a simple mathematical approach to customized corneal refractive surgery or customized intraocular lens (IOL) design that allows "hypervision" and to investigate the accuracy limits. SETTING University eye hospital, Mainz, Germany. METHODS Corneal shape and at least 1 IOL surface are approximated by the well-known Cartesian conic(More)
A method is described to determine the total retinal blood flow. Intravenous fluorescence angiography is the clinical procedure used, together with digital image processing methods. Our system consists of a standard fundus camera, a highly sensitive sensor with a low-light-level intensifier (micro-channal plate) and a CCD, a computer system including a(More)
Retinal laser spots are often over- or underexposed due to inhomogeneities of fundus pigmentation or variations in the radiation power impinging on the retina. We developed a method to control the exposure time of each individual spot of retinal laser photocoagulation in real time. The laser light reflected from the spot area is recorded by a detector. The(More)
PROBLEM To date, approaches to restore accommodation following cataract surgery have been based on the principle of a liquid or solid implant that moves within the capsular bag and thereby changes the optical characteristics of the eye. However, these implants have been associated with shrinking and fibrosis of the capsular bag, a problem that will not be(More)
An automatic, closed loop, real-time tracking device is described. The purpose of this device is, despite movements of the eye, to keep the laser beam correctly on target while performing corneal surgery. This type of laser surgery, is employed specifically to ablate some of the cornea to correct myopia, hyperopia and astigmatism.
In refractive laser surgery of the human cornea, especially in radial keratotomy, one major problem comes arises as a result of the patient's eye movements. If drugs to paralyze the muscles should be avoided, the laser beam must correspond with the eye movements. Here we present a closed loop tracking system, which uses an additional infrared optics to(More)