These Trial Lens Clip with Spirit Levels(sold as a pair) permit the measurement of the proper angle for cylinder application. These can also attach to an existing Rx for a quick opportunity to over refract. Levels ensure proper horizontal alignment. Use of a chin rest may be advisable. Once the patient’s distance Rx is correct, be sure the clip is level and add a cylinder at the proper angle, and record. Similar to Jannelli™ Clips. Each side holds 3 standard 38mm Trial Lenses. Springs are vinyl-coated to avoid damage to existing Rx. Includes a velvet drawstring pouch.