Such information is not accessible to people with color blindness , on black-and-white printouts , on older computer displays with fewer colors , on monochrome displays -LRB- PDAs , cell phones -RRB- , and so on .

This is not helpful to people with color blindness -LRB- especially monochromacy -RRB- , on black-and-white printouts , on older monitors with fewer colors , on monochrome displays -LRB- PDAs , cell phones -RRB- , etc. .
