Long-lasting performance together with coaxial optics, 18 aperture/filter combinations, and 28 focusing lenses. Features Coaxial optics produce a shadow-free spot, easier entry into non-dilated pupils, and a larger field of view versus standard ophthalmoscopes Halogen HPX™ lamp provides light for true tissue color and long-lasting performance Detect corneal abrasions with cobalt blue filter Polarizing filter virtually eliminates corneal reflection Sealed optics keep out dust and dirt Red-free filter may be used with any aperture 28 focusing lenses with a range of -25 to +40 diopters Shown with optional lithium handle