What characteristic is true for a spherical rigid contact lens?

A spherical rigid contact lens is characterized by having one continuous curve throughout the optical zone. This design allows for uniform optics and consistent vision correction across the entire lens surface. The spherical shape means that the lens has the same curvature in all meridians, which is fundamental in providing clear and stable vision, particularly for individuals with spherical refractive errors like myopia or hyperopia.

Unlike designs that may incorporate multiple curvatures or specialized features for specific lens functions, such as ballast systems for stability during eye movement, a spherical rigid lens relies on its simple, uniform curvature to achieve its intended optical effects. This characteristic is crucial for ensuring that the optical performance is predictable and clearly corrects refractive errors without compromising comfort.