Definition: Astigmatoscopes are medical devices used to examine and treat eye problems. They help identify and correct eye issues such as astigmatism, which can cause blurred vision or difficulty seeing in one eye. These devices use a special lens to focus light onto two different pieces of the eye. The first piece is called the "primary lens," while the second piece is known as the "secondary lens." By adjusting the position and size of these lenses, astigmatoscopes help correct the shape of the
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