As a new doctor, we recommend you start out with a 20D for the BIO lenses and a 78D and 90D for the slit lamp lenses. These will allow you to get a good balance of magnification and field of view. With regards to gonio lenses, we suggest a 3-mirror lens to enable you to see the retina as well as the anterior segment angle for gonioscopy. However, if you are specializing in glaucoma and will be looking at the angle regularly, we also suggest to select a gonio lens with 4 or 6 mirrors to easily see as much of the angle as possible and minimize the need to rotate the lens, resulting in a shorter exam and increased patient comfort due to less contact time.