I use Acuve Oyasis (Hyrdraclear Plus) and I love them! I can see your argument for safety but you can even make the same case for a prescription mask. For me I prefer contacts because they are so much more comfortable. The reason why we have a mask is to for the air space which allows our eyes to see clearly. The only way that I can imagine loosing a contact while diving, is having your mask off and opening your eyes. The end result is the same if you have a prescription mask. For me at least, if I need to clear my mask I always close my eyes. But you can get away with squinting your eyes so the contact doesn't float out.
If you are really concerned with safety then there is a trick what we, as tec divers do and that is to carry a back-up mask in a thigh pocket. You also can get prescription frames that you can attach to any mask. They are a cheaper solution as opposed to full prescription lenses. For me, I dont bother carrying a back-up mask when I do "normal" diving because I know that I will probably never be in a situation when I cant see because I lost a contact. And even though I have really terrible eyes (-6.5) I still can rely on my dive computer (sounds, alarms for ascent rate) and the blurr of my exhaling bubbles to get to the surface safely.
I hope that helps!
If you are really concerned with safety then there is a trick what we, as tec divers do and that is to carry a back-up mask in a thigh pocket. You also can get prescription frames that you can attach to any mask. They are a cheaper solution as opposed to full prescription lenses. For me, I dont bother carrying a back-up mask when I do "normal" diving because I know that I will probably never be in a situation when I cant see because I lost a contact. And even though I have really terrible eyes (-6.5) I still can rely on my dive computer (sounds, alarms for ascent rate) and the blurr of my exhaling bubbles to get to the surface safely.
I hope that helps!