So if a truck's GVWR is 10,000 pounds, that's the most the manufacturer and government have certified the truck to possibly weigh with fuel, passengers, and cargo. These classes exist for safety regulation, commercial designation, and registration purposes.
More serious causes of eye redness include infections. Infections can occur in different structures of the eye and typically produce additional symptoms such as pain, discharge, or changes in your vision. Infections that can cause eye redness include: inflammation of the follicles of the eyelashes, called blepharitis.
The symptoms of eye strain or eye fatigue include tired, itching and burning eyes. Any activity that requires intense use of the eyes for a prolonged time or under difficult conditions can cause eye strain. These include extended periods of: Reading; Writing; Computer work; Driving