The distribution of anisocoria in a group of unelected patients attending a primary care optometry practice

The Volk Eye Check is a hand-held medical camera device with Xenon flash that captures analyses and displays, in real time, eye measurement data including pupil size under binocular conditions. The device requires the patient to fixate the centre of the camera lens. The device is held approximately 50cm from the patient (Figure 1) and the device directs the operator to adjust the working distance as required. A minimum of two flash photographs are required. The maximum duration of the flash is 100µs. The Volk Eye Check has been shown to obtain accurate objective measurements of static eye data, such as horizontal visible iris diameter 1 . A calibration sticker applied to the patient’s forehead enhances accuracy, for static anatomical features, to approximately +/-1% of the structure being measured. Data were captured from 143 consecutive patients aged between 2 and 91 years attending a London optometry practice for an eye examination. The patients were unselected in terms of any abnormal eye conditions. The ambient lighting conditions during the capture sessions were the same for every patient. Purpose