Roof-Prism LightPath. Anti-Reflection Multi coatings. Closed Bridge Configuration. Compact Take-Anywhere Design. An Object Viewed From 90m Looks Like The Size As.When Viewed From A Distance Of 10m. These Binoculars Are Designed For Astronomy, Bird Watching, Hiking, StarGazing, Traveling, And Sport. The Stylish Two-Tone Color Design is Cool. If You Have Differing Prescriptions in Each Eye, You Can Adjust The Left And Right Lenses Independently.