Certified Paraoptometric (CPO) Practice Exam 2025

What feature do Progressive Addition Lenses (PAL) offer that traditional bifocals do not?

1. Fixed segments for distance and reading

2. A gradual transition in lens power

3. Affordable pricing

4. Increased thickness

The correct answer is: A gradual transition in lens power

The correct response highlights a key advantage of Progressive Addition Lenses (PAL) over traditional bifocals. PALs are designed with a gradual transition in lens power, allowing for a smooth progression between different focal lengths—typically from distance on the top of the lens, through intermediate zones, and down to reading power at the bottom. This design mimics natural vision more closely and eliminates the abrupt jump in vision associated with bifocals, which have a distinct line separating the two lens segments. In contrast to progressive lenses, traditional bifocals feature fixed segments for distance and reading, making the transition less seamless. Although PALs can vary in pricing and thickness compared to bifocals, these factors are not intrinsic features of the lens design that enhance visual experience, as the gradual power transition is. Therefore, the unique ability of PALs to offer this smooth power change distinguishes them significantly from traditional bifocal lenses.