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2. Eyeglass prescription - Wikipedia

   en.wikipedia.org/wiki/Eyeglass_prescription

   Using a phoropter to determine a prescription for eyeglasses. An eyeglass prescription is an order written by an eyewear prescriber, such as an optometrist, that specifies the value of all parameters the prescriber has deemed necessary to construct and/or dispense corrective lenses appropriate for a patient.

3. Glasses - Wikipedia

   en.wikipedia.org/wiki/Glasses

   Man with glasses. A woman with glasses. Glasses, also known as eyeglasses or 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 for support.

4. Corrective lens - Wikipedia

   en.wikipedia.org/wiki/Corrective_lens

   In glasses with powers beyond ±4.00D, the vertex distance can affect the effective power of the glasses. [4] A shorter vertex distance can expand the field of view, but if the vertex distance is too small, the eyelashes will come into contact with the back of the lens, smudging the lens and causing annoyance for the wearer.

5. Human eye - Wikipedia

   en.wikipedia.org/wiki/Human_eye

   The human eye is a sensory organ in the visual system that reacts to visible light allowing eyesight.Other functions include maintaining the circadian rhythm, and keeping balance.

6. The Flying Circus of Physics - Wikipedia

   en.wikipedia.org/wiki/The_Flying_Circus_of_Physics

   6.56 Yellow ski glasses 6.57 When the ice grows dark 6.58 Bright clouds, dark clouds 6.59 Noctilucent clouds 6.60 You in a looking glass 6.61 Reflections off water and a stage mirror 6.62 Pepper's ghost and the bodiless head 6.63 Tilt of windows for air traffic controllers 6.64 Images in two or three mirrors 6.65 Kaleidoscopes 6.66 Mirror ...

7. High-speed rail - Wikipedia

   en.wikipedia.org/wiki/High-speed_rail

   The speed of the service was reduced in 2011 due to high costs and safety concerns the top speeds in China were reduced to 300 km/h (185 mph) on 1 July 2011. [163] Six years later they started to be restored to their original high speeds. [145]