Dr Hector Chawla gets a special mention as an "old friend" in 'My Life, Our Time' written by the former Labour party leader who was Prime Minister between 2007 and 2010, when he lost the general election and David Cameron led Conservative party went on to set up a coalition government with the Liberal Democrats.
Brown, 66, who was left blind in one eye after an accident during a rugby match as a teenager, was operated upon by Chawla at the Royal Infirmary in Edinburgh in 1971 to rescue him from retinal detachment in his remaining good eye and save him from complete blindness.
"Had I waited even a day in rushing to the Royal Infirmary, he would have been gone and I doubt that I would have any sight today. Hector had recently returned from a year in America and I was blessed to be the beneficiary of his newly acquired techniques. A lifelong friendship followed," Brown recalls.
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"Partly due to his breakthroughs, the success rate in reattaching retinas rose in forty years from 20 per cent to 90 per cent," he notes.
Brown goes on to credit Chawla with saving his vision a second time by stepping in years later as a retired surgeon after he had suffered a sudden deterioration in his good eye while at Number 10 Downing Street.
"That morning, I was to visit the City Academy in Hackney to speak about our education reform agenda. I kept the engagement, doing all I could to disguise the fact that I could see very little discarding the prepared notes and speaking extemporaneously," he adds.
It was found that his retina in his good eye was torn in two places and that an operation was urgently needed. Brown was prepared for the surgery but asked the doctor if he could consult with his "old friend" Hector Chawla as well.
Brown was told that if his sight worsened, doctors would have to eventually operate within the eye rather than laser surgery, which was extremely risky.
The former politician, who is now involved with humanitarian work, said he was "lucky beyond words" that his retina has held to this day.