A comparison of small aperture implants providing increased depth of focus in pseudophakic eyes.

Background And Purpose: Presbyopia is characterized by a decreasing ability of accommodation - the eye's ability to alter the focus between far and near distance objects. After cataract surgery, accommodation is completely lost. Several years ago, small aperture (pinhole) implants have been presented in order to increase the depth of focus providing functional vision at far and near distance without the need for spectacles.

Ghost-image analysis in phakic intraocular lenses with central hole as a potential cause of dysphotopsia.

Purpose: To analyse the optical effect of an artificial hole in the optic centre of posterior chamber phakic intraocular lenses.

Setting: Institute of Experimental Ophthalmology, Saarland University, Homburg/Saar, Germany.

Design: Experimental simulation study.

[Corneal power after descemet stripping automated endothelial keratoplasty (DSAEK) - Modeling and concept for calculation of intraocular lenses].

Background And Purpose: Descemet stripping automated endothelial keratoplasty (DSAEK) is an established treatment option for pathologies of the corneal endothelium. It is typically accompanied with a hyperopic shift in refraction. The purpose of this work is to predict corneal geometry after DSAEK based on model data and to present a concept how to determine corneal power, e.

Myocardial rotation but not circumferential strain is transducer angle dependent: a speckle tracking echocardiography study.

Background: Doppler derived strain analysis has been shown to be angle dependent. Speckle tracking analysis using 2D echocardiographic images is thought to provide angle independent parameters of regional and global myocardial function. This study sought to evaluate whether myocardial circumferential strain and rotation derived from automatic frame-by-frame tracking of natural acoustic markers is dependent on angulation of the transducer.