Both can lead to vision problems; optic neuritis involves inflammation of the optic nerve while optic neuropathy refers to damage from any cause. Optic neuritis is one of the many causes of optic neuropathy. Optic neuropathies can be either hereditary or acquired. Acquired etiologies of optic neuropathy include ischemic, nutritional, and toxic types. 1,2 Drug-induced optic neuropathy is of the toxic type. Mechanisms of drug-induced optic neuropathy include mitochondrial dysfunction, disruption of blood flow to the optic nerve, and unknown mechanisms. 2
Fourth through eighth vehicle identification number digit reveals the vehicle features such as body style, engine type, model, series, etc. The ninth vehicle identification number digit is a VIN accuracy check digit, verifying the previous VIN numbers. This is how the check digit works/.
What Is a VIN? The vehicle identification number (VIN) is a unique combination of 17 letters and numbers that is assigned to a vehicle when it is built and stays with it throughout its life. You can do a VIN check on every car or truck produced since the 1981 model year. You can determine the year, make and model by deciphering the placement of the letters and numbers in the VIN. You also can do a VIN check to find out about recalls: Just enter the VIN in the National Highway Traffic Safety Administration's Safety Issues and Recalls page.