There is quite a bit of literature on this question. However, badly crafted studies often turn out to be measuring preference not performance. You won't find badly crafted studies in the work of Legge, those who cite him, and those who publish in the same venues.
The Scanning Laser Lpthalmoscope (SLO)is a diagnostic and research instrument that does exactly this, and has been in use for years since its invention in 1979 in Boston by Rob Webb. This is the precursor to the wearable retinal projection systems being offered today, and safety analyses were done early in its history. (SLO's have another requirement, which is that there be enough power so that backscattered light can be captured and an image of the retina be recorded).
See http://www.hitl.washington.edu/publications/r-97-3 1/ for some safety analysis work.
Slashdot Mirror
Legge, G.E. (2007). Psychophysics of Reading in Normal and Low Vision . Mahwah , NJ & London : Lawrence Erlbaum Associates. ISBN 0-8058-4328-0
http://vision.psych.umn.edu/groups/gellab/Categories.htm
http://www.lighthouse.org/accessibility/ for accessibility issues
There is quite a bit of literature on this question. However, badly crafted studies often turn out to be measuring preference not performance. You won't find badly crafted studies in the work of Legge, those who cite him, and those who publish in the same venues.
The Scanning Laser Lpthalmoscope (SLO)is a diagnostic and research instrument that does exactly this, and has been in use for years since its invention in 1979 in Boston by Rob Webb. This is the precursor to the wearable retinal projection systems being offered today, and safety analyses were done early in its history. (SLO's have another requirement, which is that there be enough power so that backscattered light can be captured and an image of the retina be recorded). See http://www.hitl.washington.edu/publications/r-97-3 1/ for some safety analysis work.