What is the proper term for a lens type used for correcting vision in more than one meridian?

The proper term for a lens type used for correcting vision in more than one meridian is "multifocal." Multifocal lenses are designed to help individuals who have different prescriptions in different areas of their lenses, accommodating various vision needs such as distance, intermediate, and near vision. This type of lens commonly includes bifocals, trifocals, and progressive lenses, as they all provide more than one focal area for different viewing distances but are encompassed under the broader category of multifocal lenses.

Bifocal lenses typically have two distinct zones: one for distance vision and another for near vision. Trifocals include an additional area for intermediate vision, bridging the gap between distance and near. Progressive lenses offer a smooth transition between multiple focal lengths without visible lines. While all these options provide correction in more than one meridian, the term "multifocal" captures the general concept of vision correction at multiple distances, making it the most appropriate answer in this context.