[Open conjunctival revision after XEN45 gel stent implantation as a standardized procedure : A step by step guide. Video article].

Background: After implantation of a XEN gel stent scarring of the conjunctiva with elevation of the intraocular pressure (IOP) is a frequent occurrence. This article describes a surgical revision technique with opening of the conjunctiva and removal of scar tissue. In order to standardize the technique the surgical procedure was divided into nine steps.

Intraocular Degradation of XEN45 Gel Stent 3 Years After its Implantation.

Introduction: We report a case of XEN45 Gel Stent removal 3 years after its implantation. The stent had degraded with a closed lumen, so a new stent was implanted.

Case Report: A 63-year-old woman was scheduled for XEN45 Gel Stent implantation.

The very large electrode array for retinal stimulation (VLARS)-A concept study.

Objective: The restoration of vision in blind patients suffering from degenerative retinal diseases like retinitis pigmentosa may be obtained by local electrical stimulation with retinal implants. In this study, a very large electrode array for retinal stimulation (VLARS) was introduced and tested regarding its safety in implantation and biocompatibility. Further, the array's stimulation capabilities were tested in an acute setting.

The XEN45 Gel Stent as a minimally invasive procedure in glaucoma surgery: success rates, risk profile, and rates of re-surgery after 261 surgeries.

Purpose: The XEN45 Gel Stent is a flexible hydrophilic tube placed under the conjunctiva via the anterior chamber. This study investigates the IOP (intraocular pressure)-lowering potential, the risk profile, and the success rate of the XEN45 Gel Stent.

Methods: Two hundred and sixty-one eyes underwent surgery.

Vitrectomy with and without encircling band for pseudophakic retinal detachment: VIPER Study Report No 2-main results.

Background: It is unclear whether or not an additional encircling band improves outcome in vitrectomy for pseudophakic retinal detachment (PRD). Also unclear is whether small gauge transconjunctival trocar-guided vitrectomy is as successful as conventional 20 gauge (G) vitrectomy.

Methods: 257 adult patients with uncomplicated PRD were enrolled in 14 vitreoretinal centres across Germany.

Acute electrical stimulation of the human retina with an epiretinal electrode array.

Purpose: To determine the threshold charges needed for eliciting visual perceptions through acute electrical stimulation of the human retina in patients suffering from retinitis pigmentosa, using an epiretinal microelectrode array.

Methods: In a multicentre study, 20 patients (average age 55 years) with visual acuities ranging from 4/200 to no light perception were included. The stimulation procedure was performed during a pars plana vitrectomy, for a maximum of 45 min, by using a microcontact film with IrO(x) electrodes connected by cable to a current generator.

A method and technical equipment for an acute human trial to evaluate retinal implant technology.

This paper reports on methods and technical equipment to investigate the epiretinal stimulation of the retina in blind human subjects in acute trials. Current is applied to the retina through a thin, flexible microcontact film (microelectrode array) with electrode diameters ranging from 50 to 360 microm. The film is mounted in a custom-designed surgical tool that is hand-held by the surgeon during stimulation.

Cortical activation via an implanted wireless retinal prosthesis.

Purpose: To demonstrate local cortical activations in the primary visual cortex of the cat as a result of retinal electrical stimulation by means of a completely wireless-controlled, implantable retinal prosthesis in a series of acute experiments.

Methods: The transfer of energy to drive the device and signals to activate any combination of 25 retinal electrodes was achieved completely wirelessly by an external transmitter positioned in front of the eye. Individually configured electrical stimuli were applied via any combination of 25 electrodes, on sending the necessary pulse parameters to the implant.