Yes, it is true, but it is also rare. Papilledema is referred to as the condition when the optic nerve swells due to increased pressure on the brain. This condition may lead to various vision problems. You might experience double vision or you might observe that everything looks very blurry. This temporary blindness lasts for just a few seconds and it can be accompanied by vomiting and headache. There are various causes of papilledema and these can cause temporary blindness. Other causes such as infections and high blood pressure can cause brain pressure too. Some medicines can put undue pressure on the brain as well, which would make you more prone to blindness.