Abstract
Photographically reduced microform copy has demonstrated its value for efficient information storage and transmission. However, microform readers have been the object of user complaints. Some of these complaints are associated with design variables. An experiment was conducted to assess the effects of the two design variables of screen angle and screen luminance on microform reading at three low levels of ambient illumination. Negative microfiche and rear-projection readers were tested. Eye fixations and regressions were measured for 26 subjects while they read comparable microform materials under the 18 conditions of a full factorial experiment. Results showed that screen angle and luminance both significantly affected reading, but variations in ambient illumination did not. A vertically positioned screen with luminance of 41 ft—Lamberts provided the best reading condition at all levels of reading comprehension. However, these results were not consistent with user preferences.
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