Which bifocal contact lens design may rotate without causing vision impairment?

The aspheric bifocal contact lens design is specifically tailored to minimize the impact of lens rotation on visual acuity. This is achieved through its unique shape, which allows for a gradual change in power across the lens surface rather than a distinct demarcation point between different optical zones. Aspheric lenses can accommodate varying degrees of rotation without causing significant vision impairment because the power transition is smooth and continuous.

In contrast, traditional bifocal lenses typically have distinct areas for distance and near vision, leading to potential misalignment and subsequent visual disruptions if the lens rotates. Multifocal lenses may also face challenges with rotation depending on their design, and spherical designs do not incorporate the specialized features required to manage rotational effects effectively. By understanding how aspheric designs function, practitioners can better accommodate patients who require bifocal options while minimizing issues associated with lens movement.