Why Do Curved Sunglasses Lack Power Despite Their Design?

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Curved sunglasses lack optical power because their parallel surfaces do not create a significant difference in curvature, which is necessary for lens functionality. While they may slightly distort light, the effect is minimal, similar to looking through a window. Prescription sunglasses are an exception, as they are designed with varying curvature to correct vision. The discussion highlights that only extremely thick and curved glass can distort images, but they do not function like traditional lenses. Overall, the design of standard curved sunglasses does not provide the necessary optical properties to enhance vision.
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Please someone tell me why sun glasses have no power,though they are curved...
 
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They do very slightly distort light but because both surfaces are curved and parallel and the material thin the effect is minimal. Like looking through a window.
 
You can get prescription sunglasses, which do have 'power'.
 
A lens works because of a difference in curvature between the sides. A curved sheet of glass with parallel sides is neither concave nor convex and does not act as a lens. This statement only really applies for relatively thin glass that isn't 'very' curved. Extremely thick / curved glass sheets will distort images, although they don't behave like simple lenses either.
 

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For simple comparison, I think the same thought process can be followed as a block slides down a hill, - for block down hill, simple starting PE of mgh to final max KE 0.5mv^2 - comparing PE1 to max KE2 would result in finding the work friction did through the process. efficiency is just 100*KE2/PE1. If a mousetrap car travels along a flat surface, a starting PE of 0.5 k th^2 can be measured and maximum velocity of the car can also be measured. If energy efficiency is defined by...
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