The penlight eye test is a simple physical test to determine if you are impaired. The officer will shine a penlight into your eyes and ask you to track the movement of the light with your eyes without moving your head. If you are impaired, your eyes will have difficulty following the light smoothly. If the eyes begin to jerk before they reach an angle of 45 degrees, then it is likely that you are impaired, but it is not a certainty.  The test is not considered proof of intoxication in many states and is often only used to indicate if the subject should be given a blood test. More than likely the test will be only one of several possible field sobriety tests you will be asked to perform. The information contained in this message is general and should not substitute for the advice and counsel of a licensed attorney. For a Free Consultation contact  today.