With 2.5V Halogen illumination (201) or 3.7V LED illumination (203) for higher-contrast and more efficient diagnosis. Dioptre disc with 18 corrective lenses (+/- 1, 2, 3, 4, 6, 8, 10, 15, 20 dioptres). Easy-to-use aperture wheel with six different apertures (fixation star, large circle, small circle, red free filter, blue filter, semi circle). High performance optics with aspherical condenser lens. Spectacle protection. Parallel optical path. Dust-protected. Carrying case included. Available in white finish.