The ophthalmoscope with unique aspherical optics with the following range of lenses: 27 lenses from -35 D to +40 D. Features Unique Aspherical Optics eliminate corneal and iris reflexes, and multi-coated optics ensure crisp, high resolution views Bright, halogen illumination for excellent color rendering and long life “TL” mount fits both Welch-Allyn and Heine handles Model Beta 200S available with a wider selection of lenses Ergonomic and comfortable design allows effective operation of the controls 27 diopter settings for perfect focus in all exam situations 6 apertures and separate red-free filter for all examination needs Dustproof housing