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Warby usually takes five to 10 business days to ship your order, with home try-ons arriving in about five days. 2. Zenni Optical. Probably one of the cheapest online eyewear stores out there ...
Pair offers only about 10 frame styles each for men and women, with five available for kids. But you can choose from dozens of top options, everything from solid colors to holiday themes to "sun ...
Distance PD is the separation between the visual axes of the eyes in their primary position, as the subject fixates on an infinitely distant object. Near PD is the separation between the visual axes of the eyes, at the plane of the spectacle lenses, as the subject fixates on a near object at the intended working distance. [3]
Adjustable focus eyeglasses are eyeglasses with an adjustable focal length. They compensate for refractive errors (such as presbyopia) by providing variable focusing, allowing users to adjust them for desired distance or prescription, or both. Current bifocals and progressive lenses are static, in that the user has to change their eye position ...
1. A strap running from a horse's back, over the head, to a bit, to prevent the horse from lowering its head beyond a fixed point. Used with harness ed horses. [12] : 20. 2. A riding aid where the rein is applied to the horse's neck on the side towards the turn. Opposite of a neck rein.
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