For over sixty years Schaeffer Vicron Optical has been a prime manufacturer of the highest quality, lowest cost disposable Post-Mydriatic Spectacles and Slip-In Myds for post-dilation use. Slip-In's offer economical and universal post-dilation protection for patients that wear glasses. The original SL1 gray Post-Mydriatic Slip-In Sunglasses eliminate 95% of all UV light up to 400nm and feature a large bridge area and longer side tabs to accommodate almost all frame styles! Schaeffer Vicron's Slip-Ins are manufactured using premium, scratch-resistant material to prevent damage during storage and use. All Schaeffer Vicron Post-Myd products are proudly Made in the USA by Pro-Optics LLC, Palatine, Illinois. Instructions: To offer temporary sun protection to post-dilation patients wearing eyeglasses, simply insert the SL1 behind the eyeglass lenses. The large bridge area features room to accommodate a variety of eyeglass nose pads while the side tabs keep the Slip-Ins securely in place. To clean, use a quality eyeglass lens cleaner and a clean, soft microfiber lens cloth. Measurements: 47 mm H x 165 mm W