eog
does not read file names from standard input. You are looking for
eog $(awk '{FS=",";if(($1>0.8)&&($2<0.2)){print NR-1"*png"}}' scindex_rscindex)
It is not clear whether or not you expect the output from the Awk script to be interpreted as shell wildcards, or as literal file names. If indeed they are literal file names (with extremely poorly chosen names, given how they will complicate processing in the shell), you should quote them somehow.