As a snake-eye myself (this is a translation to the usual nickname given to children who wear glasses in Hungarian), I can certainly appreciate the need for an eye-glass which is right for you. They offer both normal glasses and Stylish Prescription Sunglasses. All you have to do is to complete a form with the data from your prescription. The company seems to have been around for some time (since 2005 based on the original domain registration) and I couldn't find any complaints about them on the Web. They also take part in the McAfee Secure program, which doesn't prove that their site is safe, but it does prove that they think about the issue.
The answer is: maybe. In my experience finding the right glasses is only half of the problem. They also have to be fitted to the shape of your head (the nose and ears), or they won't be comfortable to wear. I've also been told by an ophthalmologist that wearing sunglasses all the time is not a good idea, since it reduces the eyes ability to adjust to the lighting conditions (for the pupils to expand / contract). The way I could imagine it is ordering online and after it arrives, going to the local optician and having it fitter properly (plus, to measure it, to make sure that it corresponds to the required parameters - I've had glasses done improperly in the past, and it is a very unpleasant, and possibly damaging experience). I'm not implying that this company would do it wrong, but we are all humans and it is better to be safe than sorry when talking about your eye sight.
Full disclosure: this is a paid review from ReviewMe. Under the terms of the understanding I was not obligated to skew my viewpoint in any way (ie. only post positive facts).