This lens is perfectly corrected for field curvature, astigmatic aberrations and coma - delivering the best retinal image of any 20 dioptre lens on the market. Its advanced double Aspheric design further maintains linear image magnification and perfect image clarity across the entire field of view for unsurpassed fundus examinations. Field of view: 46/60 degrees Image magnification: 3.13x Working distance: 50 mm Primary application: General diagnosis and treatment