  Foveation and focus cue are the two most discussed topics on vision in
designing near-eye displays. Foveation reduces rendering load by omitting
spatial details in the content that the peripheral vision cannot appreciate;
Providing richer focal cue can resolve vergence-accommodation conflict thereby
lessening visual discomfort in using near-eye displays. We performed two
psychophysical experiments to investigate the relationship between foveation
and focus cue. The first study measured blur discrimination sensitivity as a
function of visual eccentricity, where we found discrimination thresholds
significantly lower than previously reported. The second study measured depth
discrimination threshold where we found a clear dependency on visual
eccentricity. We discuss the results from the two studies and suggest further
investigation.
