When fitting a soft lens with a prescribed power, what must be considered in relation to the base curve?

Considering both the base curve and corneal curvature is essential when fitting a soft lens with a prescribed power. The base curve of a contact lens is the back surface curvature and plays a crucial role in how the lens aligns with the cornea.

The corneal curvature is unique to each individual and must be evaluated to ensure proper fit and comfort of the lens. If the base curve of the lens closely matches the corneal curvature, it allows for optimal lens movement and tear exchange under the lens, which is vital for eye health and lens performance.

Ignoring either the base curve or the corneal curvature can lead to improper fitting, which can cause discomfort, reduced vision quality, and even potential damage to the cornea. Therefore, analyzing both factors in unison is key to achieving a successful lens fit, providing both comfort and effective vision correction.

While other options may address important considerations in fitting lenses, they do not encompass the critical relationship between the base curve and corneal curvature, which is fundamental for achieving the best fitting for soft lenses.