My sons saw these when I was browsing Amazon and were absolutely dying to get a couple of pairs. At £4.99 each they aren't too dear, and they are a bit of fun. We have the red Fire Ant glasses shown above and the green Mantis glasses as well. There is also a blue hornet set.
The red fire ant shown is made of clear plastic which is quite easy to see through. If you leave the round bugs eye view section folded back, these just tint the world a beautiful red shade. they are not terribly comfortable for me, but then they are not made for adults ( more's the pity). Both boys found them comfortable enough. The painted on black eye is enough to the side that it does not interfere with forward vision, but it does ruin your peripheral vision. If you choose to use the flip forward bug's eye view, you will find your vision severely distorted. This is a small plastic circle meant too mimic a bugs compound eyes, although I somehow doubt bugs really see like this, perhaps they have something in their brain that processes everything into a single image. My children found this function fun, but only for short periods of time. Personally, I didn't like it much. I think it would give me a sore head if I tried it too long, but it does need to be tried in a safe area. I wouldn't want the children running with these on as it would be quite easy to fall.
Amazon listed the glasses as 16 cm wide. I measure 14 cm. The arms are 11 cm long. Their age requirements appear confusing. The Amazon site claims these are for ages 4+ in one section and 6 + in another. It further stated that they are not suitable for children under age 3. Although I did manage to try these, they do not fit well and are not comfortable for me. They fit my four year old best, but they are still fine for my eight year old, although I wouldn't expect it to go much higher. I could also see difficulties if a child had a particularly wide face as the glasses are a bit narrow. I feel they would be fine for ages 3+ with supervision. I think these would be brilliant as part of a costume, and they are quite cute.
My sons thought these were brilliant when they first arrived, and they are fun for a bit of dress up play. They enjoyed looking through the compound eye sections for awhile, and I do feel these are well made. As nice as they are though, they do get a bit boring after awhile. the children still wear them from time to time, but there is only so much you can do with them. I feel these would be excellent as part of a fancy dress outfit. They would also make a fun addition to another bug set as birthday gift, and they do have some play value. They haven't been played with enough to justify a five star rating in my book, but they are reasonably priced and will last for years with any luck. Considering the price, I do still think they are fair enough value for money.