Archive for May, 2008
Friday, May 30th, 2008
Fashion of eyeglasses
Glasses can be a major part of personal expression, from the extravagance of Elton John and Dame Edna Everage, to Groucho Marx and Buddy Holly.For some celebrities, glasses form part of their identity. American Senator Barry Goldwater continued to wear lensless horn-rimmed spectacles after being fitted with ...
Posted in Trends & Fashion | No Comments »
Friday, May 30th, 2008
History of eyeglasses
Precursors
The first suspected recorded use of a corrective lens may have been by the emperor Nero in the 1st century, who was known to watch the gladiatorial games using an emerald.
Corrective lenses were said to be used by Abbas Ibn Firnas in the 9th century.He had devised a ...
Posted in Semi-Rimless Glasses | No Comments »
Friday, May 30th, 2008
Variations of eyeglasses
Glasses can be very simple, such as magnifying lenses which are used to treat mild hyperopia and presbyopia can be bought off the shelf, normally referred to as reading glasses. Most glasses are made to a particular prescription, based on degree of myopia or hyperopia combined with astigmatism. ...
Posted in Rimless Glasses | 2 Comments »
Friday, May 30th, 2008
Types of eyeglasses
1.Corrective
Corrective lenses modify the focal length of the eye to alleviate the effects of nearsightedness (myopia), farsightedness (hyperopia) or astigmatism. As people age, the eye's crystalline lens loses elasticity, resulting in presbyopia, which limits their ability to change focus.
The power of a lens is generally measured in diopters. ...
Posted in Plastic Glasses | 1 Comment »
Monday, May 26th, 2008
This article is from wikipedia.com
The prescribing of contact lenses is usually restricted to appropriately qualified eye care practitioners. In countries such as the United States (where all contact lenses are deemed to be medical devices by the Food and Drug Administration), the United Kingdom and Australia, optometrists are usually responsible. ...
Posted in Contact Lenses | 1 Comment »
Monday, May 26th, 2008
Most contact lenses are mass produced.
Spin-cast lenses - A spin cast lens is a soft contact lens manufactured by whirling liquid plastic in a revolving mold at high speed.
Lathe cut - A lathe cut contact lens is cut and ground on a lathe.
Molded
Hybrids
Although many companies make contact lenses, there are ...
Posted in Contact Lenses | 1 Comment »
Sunday, May 25th, 2008
Contact lenses are classified in many different manners.
By design
(This article is from wikipedia.com )
A spherical contact lens is one in which both the inner and outer optical surfaces are portions of a sphere. A toric lens is one in which either or both of the optical surfaces have the effect ...
Posted in Contact Lenses | 1 Comment »
Sunday, May 25th, 2008
Contact lenses are classified in many different manners.
By frequency of replacement
(This article is from wikipedia.com)
The various soft contact lenses available are often categorized by their replacement schedule. The shortest replacement schedule is single use (daily disposable) lenses, which are disposed of each night. These may be best for patients with ...
Posted in Contact Lenses | No Comments »