The formal description of the lens geometry needed for spectacles, etc..
Posts made by AterasDema 0
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RE: Prescription
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RE: Chickenpox
an acute contagious disease caused by herpes varicella zoster virus; causes a rash of vesicles on the face and body
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RE: Cache
A hidden reservoir of provision (to secure it from bears) in
Arctic travel. Also, a deposit of despatches, c.