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What is a "patch"?
A patch is a covering worn over one eye to protect it, typically used for medical reasons. It is usually made of a soft material like cloth or plastic and is placed over the eye to help treat conditions such as lazy eye, double vision, or after eye surgery. The patch helps to strengthen the weaker eye by limiting its use and encouraging the stronger eye to work harder. Regular use of the patch is important for effective treatment under the guidance of an eye care professional.
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to repair by applying a piece of material to cover a hole or damage
to repair or mend something that is damaged by filling in the affected area with a suitable material
to mend or repair by affixing a small piece of material over a damaged area