There are wildly different models of swimming glasses.
Here's a quick guide to these models, so you can more easily choose the glasses that fit you best.
Glasses with a great fit and soft silicone padding
These glasses usually sit on top of your eye bones, away from the delicate skin around your eyes. This brings comfort to the wearer of the glasses, as the glasses do not weigh as much as swimming goggles with a smaller fit. Because of this, the marks caused by these glasses normally evaporate faster from the face. Please note, however, that there is not a single pair of glasses that does not leave marks at all at the end of a longer swimming workout.
However, since the glasses are large, they are not ideal for jumping exercises, because the risk of the glasses rolling out of place while jumping always increases as the size of the glass increases.
For whom: These glasses are great for open water swimming, as well as calmer swimming styles. Glasses are a great option for people who value comfort and also like the larger field of vision brought by glasses. The glasses often also offer models for unisex faces, as well as for narrower faces, because these glasses do not normally have a replaceable nose bridge (eg Arena Air-Bold, where you can find not only a large fit but also replaceable nose bridges).
Glasses with medium fit and moderate silicone padding
These glasses sit either partially over the bones of your eyes or slightly inside them. The glasses have reasonable silicone pads, so they are reasonably comfortable even during longer swimming sessions. In glasses with a smaller fit, you often also find a two-part silicone strap, which helps the glasses stay in place better even during jumps. In addition, these glasses often also have replaceable nose bridges, which allow you to adjust the model to fit your face.
For whom: The glasses are a great option for faster training swimming, for beginner competitive swimmers, for jumping exercises, as well as good general glasses for many uses.
Glasses with a small fit and minimal silicone padding
The glasses sit close to your eyes, normally well inside your eye bones. Thanks to this, the glasses protrude from the face as little as possible, so they stay tightly on the head even during the wildest jumps and help the water to flow away from the lens in the best possible way. In addition to the minimal fit, these glasses often also have the smallest silicone padding to ensure a snug fit. This can slightly increase the feeling of pressure around the eyes during longer workouts. You can also find replaceable nose bridges in these glasses to ensure a personal fit.
For whom: The best option for competitive swimmers, as well as for those who definitely want tight and well-fitting glasses. These glasses often have the best adjustment possibilities for different faces.