[Posterior YAG capsulotomy: selection of the application pattern].

Background: The posterior neodymium-yttrium-aluminum-garnet laser capsulotomy is an established and simple method with a low complication rate for the treatment of secondary cataracts; however, the risk of intraocular pressure elevation, pit marks of the intraocular lens (IOL), anterior hyaloid damage, cystoid macular edema and retinal detachment may increase with high pulse number, pulse energy, and total energy.

Purpose: The optimization potential of the method through a rational choice of the laser pattern and the strategy, taking into account the mechanical properties of the posterior capsule and the anatomical features of the retrolental region, is shown.

Material And Methods: The article provides a literature review with own clinical observations and a geometric representation.

[Diacaustic examination of the iridocorneal angle : Video article].

Background: Several methods are available for the examination of the iridocorneal angle: gonioscopy and imaging techniques, such as ultrasound biomicroscopy, optical coherence tomography and Scheimpflug photography play an important role in the diagnostics of glaucoma. There is, however, a need for simple, easily applicable methods for screening of the narrow iridocorneal angle in routine ophthalmological practice.

Purpose: To apply the diacaustic phenomenon in the examination of the iridocorneal angle, to describe the method and give its basic principles.

Affinity sorbents containing benzamidine derivatives for biomedical application.

Affinity sorbents for trypsin have been obtained by immobilization of 4-amidinophenylalkylcarboxylic acids on macroporous silica gel. Frontal chromatography was used to measure the dissociation constants of the trypsin-immobilized inhibitor complexes (Kd). The Kd value has been found to increase 50-100 fold on immobilization.