1. (General Engineering) tungsten-electrode inert gas welding: a method of welding in which the arc is maintained by a tungsten electrode and shielded from the access of air by an inert gas. Compare MIG welding.
A prescription for a controlled drug is valid for 28 days from the date given on the prescription. usually six months unless it's a controlled i.e. morphine, pethidine and methadone. These medicines are often misused, so have stricter legal controls on their supply to prevent them being obtained illegally. A prescription for a controlled drug is valid for 28 days from the date given on the prescription.
Contact lens prescriptions are more complex and may take more than one visit to finalize. Again, once the fitting is completed, we will provide you with a copy of your contact lens prescription. In general prescriptions for eyeglasses, sunglasses and contact lenses are valid for one year from the date written. We provide complete and convenient eyeglass and contact lens services in all offices and we also guarantee both the best price and your complete satisfaction on everything we do.