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January 1939


Arch Ophthalmol. 1939;21(1):70-75. doi:10.1001/archopht.1939.00860010086008

The usefulness of roentgen plates and films to the surgeon sustains a direct, and to the diagnostician in many cases perhaps a proportionate, relation to their visibility. Important factors in attaining a high degree of visibility are the brightness and color relationship of the background to the details to be discriminated, and the intensity of the illumination. With respect to the first of these factors, it may be noted that details neutral as to color are best seen on a clear white background. With respect to the second factor, it may be said that the amount of light needed to give the highest power to discriminate detail varies with the density of the film and with the person making the examination. Not all films or all parts of the same film are of the same density; and the intensity of light giving the highest visibility varies widely from person to