Blindness.
http://www.imdb.com/title/tt0861689/http://en.wikipedia.org/wiki/Blindness_(novel)
http://en.wikipedia.org/wiki/Blindness_(film)
Read the book when it came out, and was a little wary of the movie... The book is a tough read, and flawed. But the movie manages to deliver. Largely because the PA scenes of the city, and the whole mood, is wonderful. It's extremely loyal to the novel, which means that the same flaws are there. Like why does someone with such a huge advantage allow herself and her friends to be brutally raped and murdered and exploited?
That question is addressed here:
http://en.wikipedia.org/wiki/Blindness_(film)#WritingAnd I don't agree with that bullshit. The character was poorly written, which is a fatal problem in the novel since she's our main character. It's simply the meandering rape fantasy of an out of touch author who doesn't deserve the accolades he's received.
In essence, our main character becomes the woman in the horror movie you're screaming at for just about the entire time, simply because her inaction to help others, and herself, when the chips are down doesn't make any sense at all, even if you're trying to pretend it's some big question of humanity. And it not only flies against common sense and what the audience expects, but it's contrary to what she's voluntarily chosen to do from the get-go -- stick with her husband and, by extension, help all of the people in the quarantine ward.
The movie delves a bit deeper into the PA cityscape, and their life after quarantine, which is nice. That's why I was watching. Except it gets weird. A world without sighted people, no electricity and water, and she moves eight people into her apartment, and is able to make coffee for them and parade around like a housefrau?
Given that the PA genre is so horribly hit or miss, and mostly miss, it's worth watching
Blindness. It's got the acting and budget and cinematography to cancel out the flaws, and it does seem to hold up. It's not worth paying for, but is recommended for the completist.