@simon: The “damage” caused by a big drop is merely temporary – and one has to have been stilting along starwards near 20 for a while for it to happen. . . as BG drops, the concentration of water in your blood rises and starts streaming into your honey-sweet lenses, causing them to swell up like tangerines and make you myopic. Shortly after diagnosis I suddenly needed binoculars to see across a room – after a month or so of single digit BGs, lenses became flapjackic once more. (But the year and a bit I spent in the doubles caused cataracts, so I would join Charlie’s advisory choir of “Downwards and forwards”!)
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