I was about to mention the other instances of blindness, but Marigold beat me to it [img]smilies/smile.gif[/img]. I'd say that it's a combination of the Ring's increasing strength and the proximity of the Nazgul - it's crying out to them in a way, and Frodo's feeling a lot of the effects of putting it on, one of which is partial blindness to the everyday world.
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Father, dear Father, if you see fit, We'll send my love to college for one year yet
Tie blue ribbons all about his head, To let the ladies know that he's married.
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