As Ethan notes, he's about to go offline for a month -- maybe longer -- because tomorrow he's scheduled for his second vitrectomy. (For those who are curious, here's his explanation of the process, written last year.)
This is the same surgery he had last year (this time, they'll be operating on the other eye.) The good news is that the first vitrectomy was successful, and this time we know what the recovery curve might look like. (Last time, they just didn't know how long he would be incapacitated by the surgery, and told him he might be able to drive again after a few days; this time, we know it will be at least month before he can read again, and that he won't be behind the wheel of a car anytime soon.)
Even though it's easier to face with some advance awareness of what we're in for, the prospect of surgery is never comfortable, and neither is the recovery. Thanks for understanding if I'm a bit slow to answer email or moderate blog comments over the next few days -- even though there's relatively little I can do to make this easier for him, my attention needs to be focused here at home for a while.