Photochromic Lens Glass Aluminum Alloy Frame Reverse Hinges Adjustable Nosepiece Rubber Tipped Temples Includes Neck Cord and Case * RXT transition technology. RXT will darken or lighten your lens according to the amount of light. * The Eclipse RXT utilizes photochromic technology. The photochromic lenses darken or lighten according to the amount of UV rays exposed to them.