High Refractive Index (HRI) glass provides total internal reflection even with fluid in contact with the mirrors. Total internal reflection (TIR) means no light absorption or loss by a mirror coating resulting in a brighter, clearer image. High resolution image of the anterior chamber angle. Available with small or large holding ring. Also available with ergonomic handle. Lens is easily detached from handle for cleaning and sterilization. Gonioscopic solution is not required to provide optical interface. Available with 15mm or 17mm flange adapter. Purchased with a 15mm or 17mm lens flange eliminates the need to purchase additional lenses with dedicated flanges. Flange cover is easily removed from the lens for cleaning and sterilization.