Reading text safely and easily while mobile has been an issue with see-through displays for many years. For example, in order to effectively use optical see through Head Mounted Displays (HMDs) or Heads Up Display (HUD) systems in constantly changing dynamic environments, variables like lighting conditions, human or vehicular obstructions in a user's path, and scene variation must be dealt with effectively.
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Orlosky et al. (2013) studied this question.
Synapse has enriched 3 closely related papers on similar clinical questions. Consider them for comparative context: