Final answer:
Prentice's Rule still applies to progressive lenses, but calculations become more complex due to the varying power across the lens surface.
Step-by-step explanation:
Prentice's Rule is used to calculate the power of a lens based on its curvature and refractive index. When it comes to progressive lenses, the rule still applies, but the calculations become more complex because progressive lenses have varying power across the lens surface. Unlike traditional lenses with a single focal point, progressive lenses have a gradual transition between different powers, allowing for clear vision at multiple distances.
To apply Prentice's Rule to progressive lenses, you need to take into account the multiple focal points of the lens. This requires measuring the power at different points on the lens and calculating the change in power as you move across the lens surface. Progressive lenses are designed to correct for presbyopia, allowing wearers to see clearly at all distances, from near objects to intermediate and far distances.