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Wow! The world is 3-D!
I’ve always had very good eyesight. Last time my eyes were checked, about ten years ago, the left was 125% and the right 180% of normal. But they’ve always been very different: so different, in fact, that I’ve never had proper depth vision. And as it seems silly to have glasses to correct only that (cylinder and no correction; I don’t know if it’s even possible) I’ve never had glasses while my eyes were good enough.
But now I’m fortymumble, and my left eye had been falling short of expectations for some time, though not annoyingly enough to do something about it. Until this morning in the middle of the liturgy of the parish feast, when the slight squint that (I realise now) had become second nature suddenly sprouted a headache.