These GRS eyeglass-friendly 10X eyepieces are drop-in replacements for the standard Meiji 10X eyepieces. They feature a special extended relief system for a full field of view even while wearing prescription eyeglasses. A rubber ring protects eyeglass lenses from being scratched. These special eyepieces are made with the same high-quality Japanese optics that come in the standard Meiji eyepieces. Sold by pair.