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Doctor trials laser treatment to change eye colour
Dr Gregg Homer claims 20 seconds of laser light can remove pigment in brown eyes so they gradually turn blue.
However, other eye experts urge caution because destroying eye pigment can cause sight problems if too much light is allowed to enter the pupil.
The process involves a computerised scanning system that takes a picture of the iris and works out which areas to treat.
The laser is then fired, using a proprietary pattern, hitting one spot of the iris at a time.
When it has hit every spot it then starts again, repeating the process several times.
However the treatment only takes 20 seconds.
"It heats it up and changes the structure of the pigment cells. The body recognises they are damaged tissue and sends out a protein. This recruits another feature that is like little pac-men that digest the tissue at a molecular level."
After the first week of treatment, the eye colour turns darker as the tissue changes its characteristics.
Then the digestion process starts, and after a further one to three weeks the blueness appears.
Since the pigment - called melanin - does not regenerate the treatment is irreversible.