According to the national windshield repair association, the location of the damage or crack and the actual size of the damage or crack or both important in the decision to recommend repair. Also known as the acute area or your primary vision area, this is the area of the windshield in the drivers direct line of sight. According to the NWRA recommended practice, The acute area is an area approximately 8.5″ x 11.5″ wide in front of the driver and beginning just above the steering wheel. ( appox the size of a standard size piece on notebook paper ) In the acute area the NWRA recommends repair if the damage can be completely covered by a quarter, and if the finished point of impact does not interfere with the drivers view when the repair completed.