Keplerian telescopes are longer and heavier than the simpler Galilean design as they incorporate prisms to reorient what would otherwise be an upside-down and inverted image. They provide better optics with about twice their field of view at least twice as large (about 12 degrees at 4x).
All low vision ophthalmic Keplerian telescopes are focusable (with one autofocusing version) and are most frequently prescribed in 3x, 4x, 5x and 6x powers.
The Galilean form is available as both fixed-focus and focusable versions and are usually prescribed in 1.7x, 2.2x and 3x powers, and are available as high as 6x. However, their small size and low weight is useful for binocular prescriptions.
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