So-called low bridge glasses are frames designed and made specifically for people with low-nasal bridges. These frames generally feature a wider nose bridge than other frames, nose pads that can be adjusted for size, or a frame that slopes outward at the top, all of which are designed to ensure that the glasses frame does not slip off the face due to the low nose bridge. In addition, some low bridge glasses are specially made with the legs bent inward or with a more frictional surface designed to wrap around the head so that the frame does not slide easily.
From the side, a low nose bridge is needed when the slope of your nose is level with or below the height of your pupil. Of course, it's best to go through the actual eyeglass frame to wear. Whether or not they are easy to slip off is obvious.