Circle lenses are and are not bad for one's eyes. They can be depending on how and where made, if the person bought unfitted lenses without a prescription and the water content. If a person buys circle lenses from a company that requires a person to have a prescription and then takes the lenses to a reputable eye doctor to check for fit then I don't see the harm. Most harm comes from the wearer or the eye doctor not the lenses itself. My own eyes were permanent damaged, I can no longer wear contacts, due to my optometrist misfitting the lenses. Within minutes of wearing the contacts he "fitted" and prescribed to me my eyes would be bloodshot. Prior to those contacts I had no problems wearing contacts for 15 years but now can no longer wear contacts. So what ended up happening was he said it was "normal" for my eyes to experience the bloodshot because they were new lenses and to wear them daily and my eyes would get use to it. I should have listened to myself and trusted myself instead of him since I knew something wasn't right since I NEVER had that problem with previous lenses but figured it could have been because these were fitted and prescribed to me a year after having my twins and pregnancy can permanent change even your eyeballs. I tried wearing the lenses every day for about a month (I think, it's been so long now since I've even thought of this that my timing could be off) and finally near the end I just gave up because nothing I did, no amount of eye drops, cleaning the lenses, nothing would help and my eyes looked bloodshot (like I had been punched type of bloodshot). I went to a DIFFERENT eye doctor who checked and told me the lenses were fitted wrong. He checked my eyeballs for damage and noticed that they were scratched between the lenses and my rubbing my eyes after I would take the lenses out. He fitted me with new lenses and once my eyes healed I tried the new ones but it was a no go, my eyes basically rejected any foreign material in my eye. It's been about seven years since I last wore contact lenses and I could try again since my eyes have had years to heal but I doubt I'll ever wear lenses again because to this day my eyes are overly sensitive when something foreign gets into my eyes. Even if a bit of mascara or liner gets into my eyes they'll become bloodshot within minutes like when I wore contacts. My point is that it's not just the lenses that can damage the eyes but user error and even a bad prescription. I wouldn't chalk up all circle lenses as being bad since there are probably hundreds of thousands of Asian girls who wear the lenses with no problems.