The darkness, at least, you can test even without the precise glasses-type. Have you tried taking a picture of her/them into your eyeglasses store?
Personal glasses note: I let the saleslady convince me into smaller glasses than I had been considering. They are more fashionable -- but they're also less useful, because less of the world is in focus. You might want to consider if this will be an issue for you.
I also have enjoyed teasing Metageek, because he went to LensCrafters and dropped a chunk of change and I got glasses I'm otherwise quite happy with at a local optician, and ultra light weights, for under $80.
Re: Like this?
Personal glasses note: I let the saleslady convince me into smaller glasses than I had been considering. They are more fashionable -- but they're also less useful, because less of the world is in focus. You might want to consider if this will be an issue for you.
I also have enjoyed teasing Metageek, because he went to LensCrafters and dropped a chunk of change and I got glasses I'm otherwise quite happy with at a local optician, and ultra light weights, for under $80.