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2. Surface imperfections (optics) - Wikipedia

   en.wikipedia.org/wiki/Surface_imperfections_(optics)

   This is a very basic surface characterization and is easy to achieve. It describes a scratch whose brightness is less than that of a scratch at visibility grade 80 and a dig with a diameter of up to 0.5 mm (50 hundredths = 50/100=0.5). 60-40 is considered "commercial" quality, while for demanding laser applications 20-10 or even 10-5 are used. [6]

3. Corneal abrasion - Wikipedia

   en.wikipedia.org/wiki/Corneal_abrasion

   Common causes include being poked by a finger, walking into a tree branch, and wearing old contact lenses. [citation needed] A foreign body in the eye may also cause a scratch if the eye is rubbed. [citation needed] Injuries can also be incurred by "hard" or "soft" contact lenses that have been left in too long. Damage may result when the ...

4. Scratched Glass? Here's Exactly How to Repair It - AOL

   www.aol.com/don-t-panic-exactly-remove-221300328...

   Learn how to remove scratches from glass windows, tables, and vases using vinegar and toothpaste. This guide includes advice and tips from glass repair experts.

5. Anti-scratch coating - Wikipedia

   en.wikipedia.org/wiki/Anti-scratch_coating

   Anti-scratch coating is a type of protective coating or film applied to an object's surface for mitigation against scratches. Scratches are small surface-level cuts left on a surface following interaction with a sharper object. Anti-scratch coatings provide scratch resistances by containing tiny microscopic materials with scratch-resistant ...

6. Shoppers love this $7 eyeglass cleaning kit to get lenses ...

   www.aol.com/lifestyle/shoppers-love-this-7...

   A much better way to disappear dirt, oil, smears and specks of lint is the megapopular Koala Eyeglass Lens Cleaner kit. This Amazon bestseller includes a bottle of alcohol-free cleaner and a ...

7. 'I can see!' Shoppers say this $14 eyeglass cleaning kit gets ...

   www.aol.com/lifestyle/see-shoppers-14-eyeglass...

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