Coaxial opthalmoscope with halogen HPX lamp providing 30% whiter, brighter light for true tissue colour and long-lasting performance. Coaxial optics produce a shadow-free spot, easier entry into undilated pupils, and a larger field of view compared to standard ophthalmoscopes.Detects corneal abrasions with cobalt blue filter. Polarising filter virtually eliminates corneal reflection. Sealed optics keep out dust and dirt. 18 aperture/filter combinations for greater versatility. Red-free filter may be used with any aperture focusing lenses with a range of -25 to +40 diopters.