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Bifocals are eyeglasses with two distinct optical powers, commonly prescribed to people with presbyopia. Benjamin Franklin is generally credited with the invention of bifocals, but there is some evidence that others may have come before him.
Zenni Optical is an American company that sells prescription glasses, sunglasses, and contact lenses online. Founded in 2003, it offers low prices, diverse options, and themed glasses, but has low customer support and return policy.
Learn about the history and purpose of chicken eyeglasses, small devices made to prevent feather pecking and cannibalism in chickens. Find out how they work, what types and colors they have, and why they are no longer used.
Learn about glasses, also known as eyeglasses and spectacles, which are vision eyewear with clear or tinted lenses mounted in a frame. Find out about corrective, safety, sunglasses and other types of glasses, as well as their history and evolution.
Learn about the different types of corrective lenses, such as glasses, contact lenses, and intraocular lenses, and how they are prescribed by eye care professionals. Find out how they improve visual perception and treat refractive errors, and the advantages and disadvantages of over-the-counter and self-selected lenses.
A progressive lens is a corrective lens used in eyeglasses to correct presbyopia and other disorders of accommodation. It has a gradient of increasing lens power from top to bottom, and can provide clear vision at different distances. Learn about its history, design, advantages, disadvantages and adaptation.
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