Only a few take an objective, pan-Indian approach, says Daya Thussu of the University of Westminster.

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Mr Daya - who performed the operation on the NHS - describes Mr Roberts' vision as "better than he has ever experienced".

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The time finally came when Mr. Daya and myself sat down together and he told me what they proposed doing in my next operation.

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The vision, though blurred, is wonderful to have, and I consider myself a very lucky person to have met Mr. Daya and his great team.

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"This is an extreme case and highlights what we are now able to achieve with experience and the precision of modern surgical technology, " said Mr Daya.

BBC: Thalidomide poses new challenges

The consultant, Sheraz Daya, spent more than a month testing the stability of his patient's vision before using laser technology to correct the sight in the apparently non-functioning eye.

BBC: Thalidomide poses new challenges