Welch Allyn 11710 3.5V Standard Opthalmoscope Head - Halogen light for true tissue color and consistent, long-lasting illumination - 6 apertures for generalist use: micro, small, and large spot sizes, fixation target, slit aperture, and red free filter - 28 focusing lenses with a range of -25 to +40 diopters - Rubber brow rest prevents scratching of eyeglasses - Aperture selection dial and lens selection disc - Replacement Lamp: 03000-U
