The main difference between each of these loupes is magnification. Galilean Loupes: Work by leveraging two lens telescopes where the size difference between the inner and outer lenses dictate the degree of magnification (a concave eyepiece lens and a convex objective lens). They produce a lower magnification with a reduced field-of-view (FOV) (usually between 2.0x-3.5x) compared to Prism loupes. They are great for first-timers (students, we're talking to you!) due to their versatility, affordability, and ultra-light weight, but aren't designed for high-precision work. Prism Loupes: (AKA Keplerian loupes or Keplerian telescopes) Provide a greater degree of magnification, a wider FOV, and superior clarity. Prismatic loupes leverage a series of prisms to alter how your eyes perceive objects (usually two more). They are the industry standard and are often made for magnifications between (3.5x-6.0x), though Keplerian loupes can go as high as 8.0x. Prism loupes are heavier and provide a higher level of precision which makes them ideal for advanced procedures. ErgoPrism Loupes: Last, but certainly not least, we must mention the ErgoPrism loupes. LumaDent, the originators of the ErgoPrism loupes, designed a custom-made solution that enables practitioners to work in a neutral, relaxed posture. Not only do these loupes alleviate eye strain, they drastically reduce neck and back pain, too. Rx ready and tailored to your unique working distance, the ErgoPrism loupes offer a wide FOV and fully adjustable focus distance. Plus? No fitting appointments are required.