Small- Frame Dimensions : Frame Width: 137mm, Lens Width: 48mm, Bridge Width: 20mm.
Standard- * Frame Dimensions : Frame Width: 144mm, Lens Width: 56mm, Bridge Width: 18mm.
There are two sizes. Small and Standard. You can see the dimensions above. I believe all of the Landmarks are smaller.
I have like 3 pairs of lenses. Tour, one of the Landmark, and Promenade. I have tried the Landmark and they are ok but as stated with a wider head , you will probably need to stick with the standard lenses. It may be a better fit.
I am married and have 2 kids. So the Landmark should get used sometime down the line.
A few of the models are going for 99 dollars with coupon. I would almost be tempted to just get one of those set if they had one of the lenses I liked (99- 29(cost of lens)=70.) or if I felt I needed another pair.