There are also concerns about eyestrain and the potential for vision damage in small children.

FORBES: Technology

Samsung has now identified itself as a company willing to accept the loss of accessibility for the vision-impaired as collateral damage in its battle with Apple.

BBC: Samsung struggles to block iPhone function for the blind

According to Mr Gevisser, Mr Mbeki's vision of an African renaissance is an attempt to overcome the damage done by this sense of disconnection and to resurrect his continent's feeling of pride and identity.

ECONOMIST: Thabo Mbeki

Although computer usage has not been conclusively shown to cause permanent damage to healthy eyes, there is evidence to suggest that small vision defects, which do not cause symptoms in everyday life, may start to cause problems when carrying out more visually demanding tasks.

BBC: Computer eye tests

This conjures up a vision of the 1960s, when many of the ugliest council estates, which did huge social damage, were built.

ECONOMIST: Concrete is coming to a building site near you