a hand tool consisting of a handle fixed to a copper tip that is heated, electrically or in a flame, and used to melt and apply solder. Word Frequency. a pointed metal tool heated for use in melting and applying solder. More heat came from a small soldering iron which was slowly growing red at the side of the fire.
What is colour blindness? Colour (color) blindness (colour vision deficiency, or CVD) affects approximately 1 in 12 men (8%) and 1 in 200 women in the world. In Britain this means that there are approximately 2.7 million colour blind people (about 4.5% of the entire population), most of whom are male.
Blindness and Low Vision. FACT SHEET. It is estimated that about 1.3 million people in the U.S. are legally blind. Legal blindness refers to central visual acuity of 20/200 or less in the better eye with the best possible correction, or a visual field of 20 degrees or less. Each year 75,000 more people in the United States will become blind or visually impaired.