As a rule, children, who have lost vision in early age, study at the specialized school. They are taught to get skills in reading and writing by Braille. Pupils read the books printed in a relief-dot type font and write on special paper which is put into some devices. The blind listen to audio-books. More and more devices which are "able to speak" appear in private life. Speaking watches and alarm-clocks became wide popular. The person who is absolutely blind can measure on his own arterial pressure or the level of glucose in blood, and the device will speak parameters of measuring a few times. These devices are used in many countries, but now we represent only those goods which can be used in any country.