Orange Ribbon. Leukemia Inspirational words on a butterfly ribbon design for shirts, apparel and gifts with words of hope, faith, courage, love, resilient, fight, support and awareness Ideal for the Leukemia survivor, warrior and advocates.
Generally, the preferred viewing distance is between 20 and 40 inches (50 and 100 cm) from the eye to the front surface of the computer screen (Figure 1). NOTE: text size may need to be increased for smaller monitors. Provide adequate desk space between the user and the monitor (table depth).
What is Pupillary Distance (PD)? Pupillary distance (PD) is the measurement (in millimeters) of the distance between the pupils of your eyes. Pupillary distance is an important measurement used to determine the proper lens shape and alignment of your prescription correction to your line of vision. Without an accurate PD measurement, correcting vision can be difficult since lenses need to be aligned over the center of your pupil for proper clarity.