As an optician working for an optical store I've made shooting glasses fro several customers. There is several ways to make glasses for different individuals, for those requiring either single vision (sv) or bifocal or progressives ( bf / pal ). Now depending on the rx of the cust, low rx sv wearer might get away with leaving the optical centers ( oc ) and pupillary distance ( pd ) where they are. As the power of the rx increases the oc's and pd's need to move accordingly to how cust/shooters body positioning.The pd on the dominat eye narrows and the oc of the dominant eye moves up in the eyewear. For bifocal or progressive wearers the same principle applies but gets a little trickier when dealing with multifocal lenses. For progressive ( pal ) wearer I automatically put them in a bifocal ( bf ).The reason for this is the lenses for a pal is ground down in a shape of an hourglass creating peripheral distortion also for those who wear pal's know that the head and body postion have o be exact so that one might be able to see clearly in thier glasses , a shooting postion does not account for this. The bf lens gives me the opportunity to move the lens in the eyerwear while minimizing distortion. For those who shoot rifle with their iron sights, a properly made bifocal can give you two clear distances. Because the rx of a bf can be manipulated by your doc or optician you can have vision for distance and either front sight or rear depending on shooter preferance. So the bi focal would then bi-sect the pupil, the top portion would be for your distance ( targets ) and the reading portion would be for your sights. For those who shoot handguns the same principle applies just have your doc or optician adjust the power of the reading portion to accomodate for different arm lengths just like you would for rifle lengths. As for bringing in a rifle stock to help with measurments would be a good idea, but where I work it's kinda frowned upon lol. A yard/meter stick or shipping tube would suffice.
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