Used Tele Vue Dioptrx Astigmatism Correcting Lens 0.25Condition: This is a used Tele Vue Dioptrx 0. 25 astigmatism correcting lens. It is in excellent condition with clean optics. This includes one dust cap, and comes in the original box. Description: The Tele Vue Dioptrx Astigmatism Correcting Lens is a special corrector lens, which can be attached and locked onto the tops of over 20 long eye relief Tele Vue eyepieces to achieve the sharpest full field viewing possible. The Dioptrx series of lenses are