To: ISOMAN who wrote (420 ) 8/4/2000 6:52:36 PM From: Bilow Respond to of 1426 Hi isoman; Re IPD &c...How to measure IPD If you suspect that your eyes are more closely or widely spaced than average, make sure that your interpupillary distance falls within the range given for the binocular in which you’re interested. If you don’t know your interpupillary distance, look through a binocular that you know works for you and measure the distance between the centers of its exit pupils when it’s set for your eye spacing. birdbino.com Beautiful table of IPDs for various bird watching binoculars:americanbirding.org You can have eyes that are too close together...Hypotelorism refers to eyes that are close together. Hypertelorism refers to eyes that are far apart. med.usd.edu medica.com Example of Army IPD adjustment ranges for three head mounted displays (night vision goggles): 55-72 mm, 55-72 mm, 56-72 mmchppm-www.apgea.army.mil Secretly, the military favors those with small IPDs:rota-www.med.navy.mil Patients with small interpupillary distances (below 60), and requests for all FOC and wire frames may receive special consideration. More common IPD ranges for airforce equipment would be 52-72mm. Different human subtypes have typically different ranges of IPDs:Compared with previous studies, inner canthal distance, outer canthal distance and interpupillary distance in Chinese children in Taiwan were wider than those in Caucasian children, but the palpebral fissure length was not significantly different. med-aapos.bu.edu Mean values for [Turkish subjects'] IPD's in our study for both sex were found to be similar with Arabian, Hong Kong and British children, larger than those of Chinese, Black, Indian and Caucasians and smaller than those of Mexican children and mixed European population. medicine.inonu.edu.tr -- Carl