From a design perspective, one of the most important aspects of a binocular suitable for children is interpupillary distance (IPD). This is the distance measured from pupil to pupil between a persons eyes, and because children typically have smaller faces than adults, this distance is obviously much less. IPD for most children ranges from around 53 to 57mm. Binoculars adjust for different interpupillary distances by moving the central hinge mechanism, so make sure that any binocular model you buy for a child adjusts to a narrow enough setting.
Kids binoculars should also be kept down to a reasonable weight. Most full sized binoculars weigh in at 20 or even 30oz, which a child will soon tire of carrying around. The overall size of the binocular is also important, so it is a good idea to ensure that the binocular is not too wide for their smaller fingers to reach the focusing wheel. However, compact 8x20 or 10x25 roof prism models do not usually make a good choice for children. Good ones are very expensive, and correct eye placement can be tricky so they are not the easiest of binoculars to use.
Finally, close focusing distance is another feature greatly appreciated by children. Children will have a great time getting a close up look at insects and bugs if they lose interest in what their parents are watching. So if you can track down a suitable binocular that can focus as close as one or two meters, that will be an added bonus.
Source: Compact Porro Binoculars , Monocular Telescope
Read more: http://www.nbbinoculars.com/blog/
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