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Tele Vue's DIOPTRX 0.50 Astigmatism Corrector allows those with astigmatic vision to enjoy a sharp viewing experience without having to wear their prescription eyeglasses. Use this 0.50 dioptric correction if your eyeglass prescription has the same cylinder value so you can achieve tack-sharp focusing with the naked eye, which also allows you to enjoy the eyepiece's optimum eye relief for even more comfortable viewing. This corrector comes with a rubber eyeguard and lens cover, and installs quickly onto compatible eyepieces without tools or permanent modification.