Charles Stent Charles Stent Charles Stent (1807–1885) was a 19th-century English dentist notable for his advances in the field of denture making. In 1847, Edwin Truman introduced gutta-percha as a material for making dental impressions; however, this was unsatisfactory for several reasons, including its tendency to distort upon removal from the patient's mouth, and to shrink upon cooling. In 1856, Stent added several other materials to the gutta-percha, notably stearine, which markedly improved the plasticity of the material as well as its stability. He also added talc as an inert filler to give more body to the material, and red colouring. The
Minimally invasive glaucoma surgery controlled FDA study, although the effectiveness was significantly reduced by 2 years. Safety of the iStent was comparable to cataract surgery alone which is much better than conventional trabeculectomy. Common complications include failure to implant the device, touching the iris with the device, and touching the undersurface of the cornea (endothelium) with the device. Multiple studies have since confirmed the MIGS-type efficacy and safety profile of the iStent. To address the reduced effectiveness at 2 years, some studies have been performed with multiple iStents. The CyPass Micro-Stent is the first MIGS device developed for lowering of IOP through the suprachoroidal