Carson Tracker is a full featured binocular with fully-coated lenses that reduce internal glare, reflection, and produce crisp, bright images. Special coatings provide unsurpassed infra-red and ultra-violet protection, reducing eye strain and improve image contrast. The Trackerhas a center focus knob with an independent right diopter to adjust maximum focusing flexibility for all types of vision. Roll-down eyecups for eyeglass wearers.