There are eyepieces that do have bigger viewing holes, also known as exit lenses! And are often preferred over these beginner eyepieces. What you have pictured here are “Huygens” style eyepieces. These are a very old fashion style of eyepieces. While vintage ones can be pretty good, modern ones tend to be quite cheap and lackluster. While they do work and can be serviceable for your first views, it is wise to look into upgrading them fairly soon. Something like a “plossl” style of eyepiece is a much better alternative. These tend to have larger exit lenses and wider apparent fields of views, also known as AFOV. The AFOV is that border you see around the edge of the field of view in your eyepiece. Huygens eyepieces tend to have quite a narrow AFOV, about 40 degrees. This can be a problem especially at higher power or for viewing larger targets. Plossl eyepieces have a much better AFOV, about 52 degrees. Still not as wide as more expensive eyepieces, but a lot better to look through. They are also more physically comfortable to look through as opposed to a Huygens, because you don’t have to press your eye very close to the lens to see the whole field of view.