The three-year completion deadline for feasibility studies is counted from the signing of the Feasibility Cost Sharing Agreement (FCSA), which initiates the feasibility phase, until the Chief of Engineers signs the Chiefâs Report.
Legal blindness relates to the best corrected vision after an eyeglass prescription is determined. You cannot look at the numbers on your eyeglass prescription to determine this. If the best you can do on an eye chart, with the best eyeglass correction, is 20/200, that is legal blindness in most states in the usa.
A glasses prescription will be valid for two years. It cannot be valid for a longer period as a new eye test should be taken before ordering glasses as small changes may have occurred since the last. The purpose of a prescription is to order glasses to be made to give you the optimum vision possible.