To eliminate the danger of the laser light burning the back of the eye (the retina), the patient's eyes are covered with steel or lead eye shields. The laser operator must wear special goggles that permit reasonable vision while protecting his or her vision from injury. Goggles are also available for another person to observe the treatment.
The patient lies in a comfortable chair or couch. Local or general anaesthetic is not usually necessary for copper bromide laser treatment, which is generally well tolerated by adults and older children. It is felt as a brief burning or prickling sensation.
Treated vascular lesions blanch briefly when exposed to the yellow light. A single session rarely exceeds 40 minutes, depending on the extent of the skin problem. The treated skin appears quite red for a few hours. The following day there may be localised swelling and crusting eyelid swelling is occasionally quite severe but rarely lasts more than a few days.
The green light causes the surface of pigmented lesions to go grey and then form a dark scab. After a couple of weeks the skin peels off leaving a paler lesion. Combined light acts like electrocautery and destroys lesions that can be scraped off easily.
For best results, most patients require two to four treatments , usually at intervals of at least six weeks.