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2. Corrective lens - Wikipedia

   en.wikipedia.org/wiki/Corrective_lens

   Reading glasses are single vision lenses designed for near work and include over the counter glasses. They come in two main styles: full frames, in which the entire lens is made in the reading prescription, and half-eyes, style glasses that sit lower down on the nose . [ 2 ]

3. Alcohol measurements - Wikipedia

   en.wikipedia.org/wiki/Alcohol_measurements

   2 US pints. The 32 oz pitcher is usually used with large 16 oz beer glasses (2 glasses per pitcher). 40 (Imp.) 1.13 liters (L) 40 imp oz: 2 imperial pints, 1 imperial quart, or a quarter of an imperial gallon. Referred to as a "40" or “40-pounder” in Canada (as in 40 Imperial ounces; also used for spirits)) and a liter in the United States ...

4. Dioptre - Wikipedia

   en.wikipedia.org/wiki/Dioptre

   This is the same as saying that −1 dioptre lenses are prescribed for reading. In humans, the total optical power of the relaxed eye is approximately 60 dioptres. [6] [7] The cornea accounts for approximately two-thirds of this refractive power (about 40 dioptres) and the crystalline lens contributes the remaining one-third (about 20 dioptres ...

5. 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.

6. Visual acuity - Wikipedia

   en.wikipedia.org/wiki/Visual_acuity

   Year Event 1843 Vision test types are invented in 1843 by the German ophthalmologist Heinrich Kuechler (1811–1873), in Darmstadt, Germany.He argues for need to standardize vision tests and produces three reading charts to avoid memorization.

7. Refractive error - Wikipedia

   en.wikipedia.org/wiki/Refractive_error

   The individual would experience difficulty in near vision, often relieved by reading glasses, bifocal, or progressive lenses. [14] Astigmatism is when the refractive power of the eye is not uniform across the surface of the cornea because of asymmetry. In other words, the eye focuses light more strongly in one direction than another, leading to ...