Quality Riester e-scopeotoscope-opthalmoscope. Fibre optic version with 2.5 V xenon (3200K) or innovative 3.7 V LED Illumination (5000K). Fibre optic for optimum focusing and guiding the light. Opthalmoscope: 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. Parallel optical path. Dust protected, comes complete with case.