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2. List of soft contact lens materials - Wikipedia

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

   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. Newer soft lens materials include silicone-hydrogels to provide more oxygen to your ...

3. List of instruments used in ophthalmology - Wikipedia

   en.wikipedia.org/wiki/List_of_instruments_used...

   Contact lenses. to correct refractive errors of the eye; a little invasive. Phoropter. used in refraction testing. Tonometers. used to determine the intraoccular pressure (IOP) - useful in glaucoma; video link for various types of tonometers. Speculum: to keep the eyes open during any operation. Universal eye speculum.

4. 1951 USAF resolution test chart - Wikipedia

   en.wikipedia.org/wiki/1951_USAF_resolution_test...

   A 1951 USAF resolution test chart is a microscopic optical resolution test device originally defined by the U.S. Air Force MIL-STD-150A standard of 1951. The design provides numerous small target shapes exhibiting a stepped assortment of precise spatial frequency specimens. It is widely used in optical engineering laboratory work to analyze and ...

5. ICYMI: Amazon Has a Secret Coupon Page That's Filled With ...

   www.aol.com/lifestyle/icymi-amazon-secret-coupon...

   In true Amazon fashion, there's no shortage of crazy-good coupons, even outside of major sale seasons like Memorial Day. To make your pre-Prime Day shopping a breeze, we're sharing the best ...

6. Amazon has a secret coupon page — save up to 75% - AOL

   www.aol.com/lifestyle/amazon-secret-coupon-page...

   Amazon's secret page of coupons is available to you anytime. (Get a load of the categories list in the left-hand column!) Quick Overview. ChefSofi Cheese Board Set . $52 $72. Save $20.

7. Blue Apron's 4th of July sale has savings up to 50%: Try one ...

   www.aol.com/lifestyle/blue-aprons-4th-of-july...

   Right now, you can get 50% off an order placed for the first week of your Blue Apron meal kit subscription. We've done the testing and tried meal kits to fit all different diets and lifestyles ...