Hi. .. .I think the regulations would vary from country to country, and from case to case. It seems to be a bit like Laser surgery - the authorities will always have some doubts.. .. .In my case, I'm in South Africa. Last year I had intra-ocular lenses inserted in both eyes as an alternative to Lasik surgery. I started flying training in October, and managed to persuade the local authorities to grant me a Class II medical. At the time the doctor did warn me that they would be unlikely to grant me a Class I medical, and that even if they did some aviation employers might regard the lenses as a negative factor. I'm actually about to apply for a Class I medical (no harm in trying), so I might be able to give some feedback in the near future.. .. .The concern about intra-ocular lenses seems twofold:. .1. They are relatively new, and the long term effects have yet to be assessed. It has been suggested to me that the insertions may make me more prone to cataracts in the long run, necessitating the removal of the natural lens altogether. .2. As with Lasik, there are doubts about the strength of the eyeball after the operation. As far as I could determine, there is no evidence on the effect of a sudden decompression on the corneal flap.. .. .On the positive side I can tell you that I am skydiving and scuba diving, and have experienced no problems with the lenses. On my first skydive after the operation (about 6 weeks), I had a seriously hard opening - walked around with a sore back and neck for two days - but there was no effect on the lenses. . .. .Hope this helps.. .Regards. .Mike