Clinically proven, 21 years of Retinal Acuity testing. Predicts same line in 88% and with 2 lines in 95% for moderately dense cataracts of opaque posterior capsule. New Sleek Ergonomic Design with Durable Aluminum. Case. Digital voltmeter quantified adjustable brightness and shows charge level. Can be retrofitted for exchangeable charts (XL). Includes RAM Prime, Selection of Vision Chart, Carrier Frames with two Pinhole Lens Clips, Trial Lens Pinhole Disc, Charger, Trial Lens Pinhole Disc, & Lens Cloth. Options: Panoramic Pinhole Lens Clip, Lanyard Switch, Adjustable measuring Lanyard, Low Vision Attachment (to 20/1600). Click to see Reference #2, Consider 10 Year Extended Warranty.