Instruction: Evaluate the answerability of a question by analyzing the related document, outputting yes if the document contains information addressing the question, and no otherwise.

Input:
Question: The lenses look to be slightly curved. Are they?
Document: They look a little less than sturdy, but for the price they are actually of better than expected quality.All in all, they're excellent value for money, and they do the job.
The bar is in &#12551; shape so that this &#12551; together with the two rubber ends of the clip can squeeze your precision lenses in the middle.
These clip-ons look great and fit on my glasses well, but after only a month of using them, the clip broke, and the tension causes it to pop apart very frequently. These are good for light use, but for daily use I'd recommend getting something a little more durable.
Given that it's increasingly difficult to find clip-on shades at places like Sunglass Hut, this is literally the last best option. Sure they're kind of big - they have to be since they're one size fits all - and that can detract from comfort a little, and make me look a bit like a bug.
Product delivers what it promises.Wish seller had better quality control over all product lines.While the grey lenses are polarized and work well, do NOT enen consider the yellow pare if polarization is your goal.
I will come up update when I have more info/review about this.In the shipped package, there is a lazer pattern sticker. It says &#34;TEST: wear glasses to see the beautiful pattern.&#34; On the sticker it shows a fisherman swing when you look at it with bare eyes. When you look at the sticker through the sun glasses, the &#34;fish&#34; shows up.
That's why I decided to give this inexpensive pair of clip on a try.The first thing you really want to be careful before the purchase is whether this would fit your frame or not. As stated by other reviewers, there is a &#34;bar&#34; underneath the black spring clip, that may cause the clip-on lenses too high on top of your precision glasses.
But when I tried with my other polarized sun glasses, this happens too. I did the simple polarized test by this and another pair of sun glasses too, and at some angle, the light is occluded more then at other angles.The lenses are not super delicate for scratch. I keep it in the black sleeve that come with them, and put it in my purse. I think there may have been some pressing against them in my purse. But it has been fine.
Bought these for one set of glasses. They didn't clip on at all because the glasses have a small bar across the tops of the lenses. Tried the flip ups on two other pairs of glasses. They barely managed to clip on to either, although other clip-on brands have worked fine with those glasses in the past. Perhaps the clips on these flip ups are too short or too narrow for good clipping. Maybe someday we'll find glasses where they actually work.
Now the clip-on almost fits on top of my glasses, except the inner corners of the frames of the two lenses was a little bit outside the sun glasses lenses.The lenses darken the view pretty well when it is sunny (tested by the glittering shining reflection of the waves at the beach). But since this pair is so inexpensive, I am not sure how well it protects my eyes from sun light .... I did feel a bit eye sore after these two days of using it.
Answer: yes