Final answer:
PureVision2 and BioTrue ONEday Multifocal lenses are designed to correct vision for those with presbyopia, offering clear vision at multiple distances with a multifocal design.
Step-by-step explanation:
The PureVision2 and BioTrue ONEday Multifocal contact lenses are designed to correct vision for individuals with presbyopia, a condition often associated with aging where the eyes have difficulty focusing on near objects. These lenses provide a range of vision corrections, allowing wearers to see clearly at all distances, including nearsighted (myopia), farsighted (hyperopia), and reading vision.
The design incorporates different zones that provide the necessary power to correct vision at varying distances. This segmental design usually has a gradual change in lens power from the center to the periphery, which can be referred to as a multifocal design. This allows the user to focus on objects at different distances without the need for separate reading glasses or bifocals.
Overall, PureVision2 and BioTrue ONEday Multifocal lenses cater to those who require a versatile visual solution that addresses multiple focusing issues simultaneously, providing convenience and improved quality of life for the wearer.