Optical lenses use the principle of refraction to focus light rays or disperse them. Refraction is the bending of a ray of light when it moves between media of different densities at an angle. More » Science Physics Optics & Waves

Costco Optical is the eyewear and vision care division of Costco; Costco Optical offers discounts on prescription glasses and contact lenses in addition to eye exams from licensed opticians and optometrist, as reported o... More »

The Optical Superstore does not currently ship outside of Australia, as of September 2015. However, the company website implies that there are plans to ship internationally in the future. More » Health Vision Glasses & Contacts
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A magnifying glass "bends light rays to make things look bigger than they are," according to This fools the eye and brain, causing the light to look as if it comes from a different object. As light rays pass t... More » Science Physics Optics & Waves

Concave lenses, which are thinner at the center than edges, work by allowing parallel rays of light to pass through, refract and diverge, making the image appear to come from one point. This point is known as the princip... More » Science Physics Optics & Waves

An observer's perception of an object being examined changes with a magnifying lens because the lens bends the light rays from the object, thus distorting the size of the image formed, making it appear bigger. Light rays... More » Science Physics Optics & Waves

A pencil looks bent in water because of a phenomenon called refraction. When light enters water, it cannot move as fast as it does in air. As light enters water at an angle, it bends away from its original path, and this... More » Science Physics Optics & Waves