What is the correct way to use a handheld digital pupilometer to take a pt's PD? I've been told a few different ways in my time, so I just thought I'd throw it out here. Do you set it to infinity and view both eyes? or one eye at a time? Set it to 40cm or 30? to get a near PD or just subtract 1.5mm from the distance PD? We don't have a user manual where I work now and some opticians are using it differently. Thanks