Welch Allyn's binocular indirect opthalmoscope features a video-aligned optical system to ensure precise positioning of components for easy viewing. Its well-padded leather headband and swooped design combined with ergonomic controls provide comfort and simple operation. Illumination and visual pathways can be converged for excellent visualization and true small-pupil capability. It can be easily adjusted to handle interpupillary distances of 49mm to 74 mm. Optional diffuser filter broadens the illumination beam to facilitate enhanced viewing of the perpheral retina. Welch Allyn's own SoftTilt park/rest feature allows optics to be moved to a stationary position out of your line of sight. Halogen light source.