Although bifocal lenses are a not a new technology, they were originally not very popular with customers because they were difficult to wear and adjust correctly. However, recent technological advances have produced more efficient and comfortable designs in a range of varieties, leading to increased use.
Eye professionals use advanced technologies by considering two important factors in deciding what may work best for each patient's bifocal lenses: pupil size and the "add" or near-prescription number. Low adds are more suitable for alternating vision bifocals, and high adds are more suitable for multifocal lenses that work very similarly to the way progressive eyeglass lenses work. Alternating vision lenses are commonly know as translating lenses, and they may also work better for patients with large pupils. Vision centers will sometimes offer free trial lenses to let the patient find the best fit for the situation.
These different techniques have improved reviews of such lenses, Doctors also often try two different techniques to see what works best for patients. The monovision treatment involves using single-vision lenses with the near prescription in one eye and the prescription for distance in the other. The modified monovision strategy involves using the mutltifocal in one eye and the single vision on the other.