HEINE BETA 200S LED Ophthalmoscope head with LEDHQ technology is a maintenance free, dust proof ophthalmoscope with stepless brightness control (3-100%). The precision optics are mounted on a durable aluminum frame making it designed for daily use in hospitals and clinics. Apertures: Slit, fixation star with polar coordinates, blue filter, large spot, small spot, pin-hole and hemi-circle. All apertures can be combined with red-free filter. Diopters: 74 single step diopters from -36D to +38D.