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Wratten yellow filter to be used with Fluorescein (Yellow Transmission Filter = 66%) to facilitate the visualization of the fluorescein examination- red filter to be used with Lissamine Green (Red Transmission Filter = 14%) to facilitate observation of the vascular system. Placing them in front of the Slit Lamp, they offer excellent contrast and sharpness in the image, allowing an optimal and precise assessment- for hand held use