During bicentric grinding for prism correction, which direction is typically ground into the lens?

In bicentric grinding for prism correction, the correct direction typically ground into the lens is upward, referred to as "up." The process involves creating a specific optical effect by adjusting the curvature of the lens. When prism is incorporated into a lens, the goal is to direct light towards a specific point to enhance visual alignment for the patient.

In this context, grinding "up" allows for the necessary adjustment to the optical axis of the lens to provide the desired prism effect. This can assist in conditions such as strabismus, where alignments of the eyes are adjusted to help improve binocular vision.

The other directions are less relevant for achieving the prism effect required in selecting and fitting lenses for various binocular vision issues. Thus, understanding that "up" is the appropriate grinding direction highlights the specific manipulation of lens curvature needed for effective prism correction.