What type of glasses often require consideration of vertical imbalance?

Multifocal glasses, which include options such as bifocals and progressives, require careful consideration of vertical imbalance due to their design. These lenses have multiple areas of vision correction—typically for distance, intermediate, and near vision. Because these different zones are positioned at various heights on the lens, if the glasses are not properly aligned with the wearer’s pupils, it can lead to a disparity between the visual fields when looking through different parts of the lenses. This vertical misalignment might cause problems such as eye strain or discomfort, making it essential to accurately fit multifocal glasses to ensure that both eyes work harmoniously while minimizing any vertical imbalance.

Single vision glasses, fashion sunglasses, and children's glasses may not have the same complexities associated with multiple focal points, thus they typically do not require the same level of attention to potential vertical imbalance.