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by convention, an axis of 90° is vertical, 0° or 180° are horizontal; if the cylinder power is positive, the lens is most convergent 90° from the axis; if the cylinder power is negative, the lens is most divergent 90° from the axis; if the cylinder power is zero, the lens is spherical and has the same power in every meridian
Modern glasses, the most dominant form of eyewear. Eyewear is a term used to refer to all devices worn over both of a person's eyes, or occasionally a single eye, for one or more of a variety of purposes. Though historically used for vision improvement and correction, eyewear has also evolved into eye protection, for fashion and aesthetic ...
The Glasses Apostle by Conrad von Soest (1403) Seated apostle holding lenses in position for reading. Detail from Death of the Virgin, by the Master of Heiligenkreuz, c. 1400 –1430 (Getty Center). French Empire gilt scissors glasses (with one lens missing), c. 1805
The following plots show the difference in spherical power at a 0 mm vertex distance (at the eye) and a 12 mm vertex distance (standard eyeglasses distance). 0 mm is used as the reference starting power and is one-to-one. The second plot shows the difference between the 0 mm and 12 mm vertex distance powers.
WeHo, for those who aren't immersed in L.A. lingo, means West Hollywood. Get weather updates from USA TODAY: USA TODAY's Weather Watch. The Los Angeles Zoo, also in sprawling, mountainous Griffith ...
There's a new No. 1-ranked player in the transfer portal. Washington State quarterback John Mateer is entering the transfer portal, Cougars coach Jake Dickert confirmed Monday. He's the No. 1 ...