The cervical range of motion (CROM) device is an instrument that was designed to aid in the evaluation of the range of motion of the cervical spine and has been shown to have a high degree of interrater reliability and reproducibility in that regard.7,8 The instrument consists of a spectacle frame that is worn by the subject. There are 3 dial angle meters attached to the instrument. A sagittal plane meter and lateral flexion meter serve as gravity meters that can assess a chin elevation or depression and head tilt, respectively. A third meter is a magnetic compass that responds to a shoulder-mounted magnetic yoke and can measure a face turn as shown in the image. Each of the 3 meters can be read to an accuracy of approximately 1°. Theoretically, the CROM device might be ideal for use in the ocular motility examination for assessing abnormal head positions, limitations of ductions, and the range of single binocular vision at distance viewing. The purpose of this study is to assess the possibility.