Electronics manufacturer Samsung has issued a health warning about its new 3D television sets two months before they are due to go on sale. On its website, the company warned that pregnant women, the elderly, children, and persons with serious medical conditions may be at risk for such conditions as "confusion, nausea, convulsions, altered vision, lightheadedness, dizziness, and involuntary movements such as eye or muscle twitching and cramps." Those side-effects, it said, could be induced by the electronic system required to view 3D images on its sets -- in particular, the battery-operated 3D glasses which sync the left and right images to the TV screen and require the brain to process them into a single 3D perception. The warnings were presumably devised to protect the company against possible future lawsuits from those who might be affected by such a system.