There are states that issue a special permit for the usage of bioptic telescopes while driving for those who do not pass the regular vision requirements for driving. These unique telescopic spectacles enable people to switch between magnified and standard views, usually by adjusting focus from the upper part which features the mounted telescopes to the lower section called the “carriage” which provides standard vision. There are many versions of these glasses, from simple flip-top models where you can raise the telescopes, to automated focusing options. Depending on the eye disorder and level of severity, these glasses often provide the required improvement in vision which enables people to safely and legally drive a vehicle according to their state's DMV laws. U.S. states such as Tennessee permit the use of these glasses, provided that all of the additional criteria are met.