Welch Allyn 11720

Halogen illumination with coaxial optics produce a shadow-free spot, easier entry into undilated pupils, and a larger field of view. Polarizing filter virtually eliminates corneal reflection. 18 unique aperture/filter combinations for greater versatility. Sealed optics keep out dust and dirt for years of maintenance-free operation. 28 focusing lenses with a range of -25 to +40 diopters.