Tire placard pressure is often much lower than listed on the tire sidewall. Air pressure given by the vehicle maker was based on the tires supplied with the vehicle. They design many newer replacement tires to give a good ride, with much more pressure.
Fresnel lens. A Fresnel lens is a type of lens invented by Augustin-Jean Fresnel. Originally developed for lighthouses, the design enables the construction of lenses of large size and short focal length without the weight and volume of material which would be required in a lens of conventional design. Detailed information.
But it's true that when contact lenses were invented for real came much later. Many believe da Vinci's ideas eventually led to the development of contact lenses more than 350 years afterward. In 1827, English astronomer Sir John Herschel proposed the idea of making a mold of a person's eyes.