Comes available with 2-filter selections which provide optimum light levels for entering healthy eyes and those with cataracts. It has 68 focusing lenses that range from -30 to +38 diopters for better resolution. Its neutral filter provides the ideal amount of color-accurate light for entering healthy eyes without unwanted reflex. The opacity setting provides the brightest light for easy entry.- Prestige Opty PanOptic Ophthalmoscope Plus with Retina Transfer (US Only)