Bubble formation as primary interaction mechanism in retinal laser exposure with 200-ns laser pulses.

Background And Objective: Retinal laser photocoagulation is generally performed by laser pulses of a few hundred milliseconds. The tissue interaction mechanism is a pure thermal interaction mechanism. As pulse duration gets shorter, different, non-thermal interaction mechanisms start to appear.

The vascular component of proliferative vitreoretinopathy membranes: an immunohistochemical and ultrastructural study.

Background: The basic cellular components of proliferative vitreoretinopathy (PVR) membranes are well studied. Endothelial cells have also been documented. The importance of the vascular element in PVR has received little attention, as vascular components are clinically inapparent.

[Scanning electron microscopy studies of the human lens capsule after capsulorhexis].

Background: In order to better understand the mechanism of tearing of the human lens capsule during circular capsulorhexis, scanning electron microscopic (SEM) examinations were made particularly of the rhexis edge.

Materials And Methods: Anterior segments from cornea donor eyes, as well as capsular pieces extracted during cataract surgery, were studied after fixation in glutaraldehyde, critical point drying, and sputtering with gold.

Results: The edges of the capsulorhexis were found to be very regular even in the area of zonular attachment.

[Cyclophotocoagulation with the diode laser in contact procedure with a new focussing tip].

Unlabelled: During contact cyclophotocoagulation (CPC) energy is transmitted through the conjunctiva and the sclera by direct contact of a plain fibre tip. Alteration and scarring of the conjunctiva and the outer parts of the sclera cannot always be avoided. We used a new fibre tip which defocuses the laser light on the conjunctiva and sclera and focuses the laser light on the ciliar body.

[Case study of a solitary vitreous body cyst].

Vitreous cysts are rare and their origin unclear. We present a case of a 47-year-old woman who, after undergoing retinal detachment surgery on several occasions, developed disturbing vitreous opacities with which she presented for possible vitrectomy. Besides the typical postoperative vitreous condensations and opacifications, a solitary spherical cystic structure was present in the anterior vitreous cavity.