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This investigation finds that reading addition remains unchanged by different target configurations and luminance levels, suggesting stability in visual adjustments.
The reading addition required by each of 30 subjects in this study was determined subjectively by means of five different cross‐cylinder targets and under three photopic luminance levels of 3.5, 30, and 220 cd per m 2 . We conclude that the amount of the reading addition is not significantly affected by moderate changes in target configuration nor by changes in specific photopic luminance levels of either fluorescent or incandescent light.
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Eng et al. (1982) studied this question.
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