If you’ve ever been to the eye doctor, and you see a blue light, they’ve usually put a yellow dye (also called sodium fluorescein) in your eye first. After they put the dye in, they use a blue light to assess your eye. There are different reasons why a doctor might use a blue light: ✅To check the surface of your eye for problems such as dry eye, corneal abrasions, and find out what the cause of an uncomfortable eye might be. ✅To check your eye pressure. This involves a small probe called a tonom

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