Instruction: Analyze a question and its supporting document. Predicting answerability based on the information provided in the document. Output yes if the document contains relevant information to answer the question, otherwise output no.

Input:
Question: do these glasses block blue light?
Document: Needed to block out blue light at night to help sleep.Glasses fit over my glasses for watching the TV. I have a small head.I would recommend them if this is what you need. Everything looks yellow.
I bought these to block out blue light after the sunsets. They work quite well; I'm falling asleep a lot sooner, and my sleep is deeper. I have noticed that I dream every night that I use the glasses, and I can usually remember the dreams.The glasses aren't extremely comfortable.
Look up blue blocking glasses, circadian rhythm on Paleo/Primal blogs, and buy these asap!Since using these I've been sleeping much, much better. I fall asleep quickly and stay asleep.I put these on a couple of hours before bedtime, and they completely block all blue light.Love these so much, highly recommend!
I bought these as blue light blockers as I am trying to nail down my sleep problems (I suspect a circadian rhythm disorder). They do in fact block blue light and fit comfortably over my regular glasses. They fit perfectly (and have adjustable side-arms), are crystal-clear, and have some wrap-around material so that they are very good at blocking extraneous light.
I purchased these to use as blue-blockers to help with sleep-related issues, and they work very well! They seem to fully block all blue light (I can't see any blue colors while wearing them) and fit well, even when I'm wearing my prescription glasses underneath. They're fairly adjustable in length, which makes them easier to wear with another pair of glasses.
Mainly interested in blue-blockers to improve sleep. Try a different pair that worked fine for outdoor sunglasses, but were too dark for indoor at night. Plus they weren't made for use over glasses. These seem to be the answer. Safety style glasses, not sunglasses...not meant to be worn in public. Uniformly and lightly tinted to block blue light they are made to fit over your glasses. Some said they were too small for their head.
I bought these to block out the blue light before bed time. They seem to be doing the trick! I put them on about an hour or so before I go to bed - when I'm watching TV and/or playing on my phone. I'm also thrilled that I can wear them over my glasses - and they stay on my head (I have a small head, so it's sometimes hard to find glasses that will stay put). These fit snuggly - I'm very pleased.
I bought these primarily to block blue laser light. I don't currently have the laser yet, but testing these glasses with a violet laser, they block most of the light. I have also noticed that they completely block the light of my blue christmas lights, and you can actually see the red hot filament! If you are looking at these to improve your sleeping, I noticed that they do block out more light than normal. I don't have sleeping problems, so you can be the judge of it.
Great shade of blue light filter glasses. Uvex makes a great and durable product, and the side panels block light coming in peripherally. I have no problem with discomfort, and can wear these while reading before bedtime without any issues. I highly recommend these glasses. For years I used Uvex safety glasses in surgery until I retired. This is a great quality product at a fantastic price.
A while ago I read online that the blue light emitted by computer screens among other things can keep you awake at nite. I found out these safety glasses happen to block the blue light, and I find that when I wear them for an hour or two before I go to bed I do sleep better. Maybe science, maybe placebo, but cheap and effective either way.
Answer: yes