a spanish expert , dr celia sanchez-ramos , has found the led screens , produced from about 2007 onwards , emit up to five times as much blue light as older technology .
this matches my own experience , in which pre-2007 screens tend not to cause discomfort , as well as ` digital workers ' and those - like me - who are especially sensitive to blue light .
children and the elderly are most at risk on account of their delicate eyes .