Final answer:
Clariti 1 day multifocal lenses are characterized by a concentric ring design. This design incorporates multiple lens powers into concentric rings, allowing for the correction of presbyopia by focusing light for different distances onto the retina.
Step-by-step explanation:
The design feature that characterizes Clariti 1 day multifocal lenses is concentric ring design.
Multifocal contact lenses are designed to correct presbyopia, a condition that affects the eye's ability to focus on objects at varying distances, commonly due to aging. The concentric ring design of multifocal lenses consists of multiple lens powers arranged in concentric rings that provide correction for various focal lengths, enabling the individual to see clearly at different distances.
To understand why a concentric design specifically assists with presbyopia, consider that as the eye's lens ages, it becomes less flexible. This loss of flexibility makes it harder to focus on objects, especially those that are close. A multifocal lens with a concentric ring design addresses this by allowing different parts of the lens to focus on near and far objects.
Farsightedness or hyperopia is when images are focused behind the retina and requires a converging lens to correct it, while myopia or nearsightedness is when images are focused in front of the retina, needing a diverging lens for correction.