While it is technically possible to keep prescription sunglasses in a car, there are a few things to consider before doing so. For starters, prescription sunglasses are generally more expensive than regular sunglasses, so it is important to make sure they are stored properly to avoid damage. Additionally, the lenses of prescription sunglasses can absorb heat from the sun, which can cause them to warp or crack over time. Therefore, it is best to store them in a cool, dark place when not in use. Finally, it is important to check the warranty on your prescription sunglasses before storing them in a car, as some manufacturers do not cover damages caused by extreme temperatures.