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2. Contact lens - Wikipedia

   en.wikipedia.org/wiki/Contact_lens

   Contact lenses, or simply contacts, are thin lenses placed directly on the surface of the eyes. Contact lenses are ocular prosthetic devices used by over 150 million people worldwide, and they can be worn to correct vision or for cosmetic or therapeutic reasons.

3. What to Know About Colored Contacts—and Why You Shouldn’t Buy ...

   www.aol.com/lifestyle/know-colored-contacts-why...

   Influencers may flaunt online colored contact brands, but you could literally go blind wearing them. Here’s how to safely change your eye color.

4. Wikipedia

   en.wikipedia.org/wiki/Color-contact-lenses-cheap

   Wikipedia

5. List of soft contact lens materials - Wikipedia

   en.wikipedia.org/wiki/List_of_soft_contact_lens...

   planned replacement contact lenses. The US Food and Drug Administration (FDA) defines soft contact lenses as: made of soft, flexible plastics that allow oxygen to pass through to the cornea. Soft contact lenses may be easier to adjust to and are more comfortable than rigid gas permeable lenses.

6. Color blindness - Wikipedia

   en.wikipedia.org/wiki/Color_blindness

   Color blindness or color vision deficiency ( CVD) is the decreased ability to see color or differences in color. [2] The severity of color blindness ranges from mostly unnoticeable to full absence of color perception. Color blindness is usually an inherited problem or variation in the functionality of one or more of the three classes of cone ...

7. Glasses - Wikipedia

   en.wikipedia.org/wiki/Glasses

   Glasses, also known as eyeglasses and spectacles, are vision eyewear with clear or tinted lenses mounted in a frame that holds them in front of a person's eyes, typically utilizing a bridge over the nose and hinged arms, known as temples or temple pieces, that rest over the ears. Glasses are typically used for vision correction, such as with ...