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a built-in diopter adjustment, and; a fully internal focusing system, that moves internal optical lenses to prevent intrusion of dust and moisture into the binocular body with centrally located adjusting means to compensate for vision differences of the two eyes.
The Prentice position is an orientation of a prism, used in optics, optometry and ophthalmology. In this position, named after the optician Charles F. Prentice, the prism is oriented such that light enters it at an angle of 90° to the first surface, so that the beam does not refract at that surface. All the deviation caused by the prism takes ...