Not true. Anymore.
For starters a properly working air bag system will help prevent injury, even if you are wearing glasses. Second gen systems have dual stage deployment, and can deploy only one stage for lighter passengers, people with a forward seat position, or if you aren't wearing your seat belt.
The original systems, which were very very primitive compared to modern ones, did cause more injuries than they prevented. The same is true of current systems if you are stupid enough to buckle your seat belt behind your back which makes the computer see a +150 Lb person who is properly restrained, instead of one who is going to go flying.
The buckle sensor is a simple contact switch, but make sure that you have one that is working properly. If the computer sees a buckled belt and you aren't wearing it, or it isn't buckled, you will get full air bag deployment, and that will not be good for your face (prolly not good for your neck, spine, or other organs housed in the vicinity of your face).
If you are using a harness then you will have some other issues to overcome. There are sensors and pretensioners that look at how tight your seat belt is and then tries to load up the tension on the belt when it senses a crash.
This topic came up a while back and it was suggested that the OP install the new seats on the original tracks. This leaves the airbag system intact and should work with pretty much all aftermarket seats.
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