Next, the researchers had female subjects participate in what they thought was a vision test.

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He is now employing a vision test used by the US Air Force which checks the ability to discriminate between white, black and grey - the lack of which is another symptom often seen in chronic ciguatera.

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"You get the vision, then you test it with software, " Borakove said.

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He got a chance to test his vision of a store chock full of such apparent bargains in 1982, when he spotted a vacant restaurant to let on the road to Los Angeles airport.

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In a test on ten patients with retinitis pigmentosa, an inherited disease involving retinal degeneration, vision improved significantly.

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You can have a big vision for what you might do, but you need to break it down into a step you can actually test in the market.

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