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.
The Optometric Technician Tracking Log. What was the first contact lens in history? Glass. Who first described the concept of a glass contact lens? Leonardo Da Vinci: When did Da Vinci first think of the glass contact lens? The year 1508: When was the glass contact actually produced and fitted? 1888: What was the first all-plastic contact lens?