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Measuring eyeglases can get a bit complicated so I'll just put down the basics!
The precription in the lenses can be measured with a focimeter (It looks a bit like a microscope). Prescriptions are most often broken down into four parts:
Sphere - Determines whether you are short of long sighted. (Measured in diopteres)
Cylinder - Dermines Astigmatism (Measured in diopteres)
Axis - The degree at which the cylinder in the lens sits to correctr astigmtism. (Measured in degress)
Prism - Not a very common feature of a prescription. It alignes eyes that are not looking parralel to each other. It has a base direction to determine the exact way in which it is cut into or added to a lens. (Measured in diopteres)
Reading Addition - A positive (+) addition to a prescription for enlargement. It is a Sphere only addition to a precription. (Measured in diopteres)
Eye and Bridge Sizes - The eye and bridge sizes are of a frame measured in mm and are usually printed on the frame itself. The eye size is the largest measurement across the lens and the bridge size is the measurement accross the nose.
Arm Length - The arm length is the distance from the temple to end of the arm on the frame. This is measured im mm.
Pantascopic Tilt - The pantascopic tilt is measured in degress and is the angle at which the lens sits relative to the arm of the frame. Usually this should be between 10 and 12 degrees but this is variable.
Vertex distance - Measured in mm the vertex distance is the distance between the back of the lens and the eye. This should usually be between 10 and 12 mm. Again there are variabes here.
Fitting heights - Mainly used for bifocal, tirfocal, varifocal and aspheric lenses, the fitting height is measured in mm and defines the distance between the optical centre of the lens and the botton of the lens.
These are the very basic glasses measurements and all should vary with prescription and by person. Please leave a message on my board if you need further information.
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Eyeglasses are typically measured using three key dimensions: lens width, bridge width, and temple length. The lens width is the horizontal width of each lens, the bridge width is the distance between the lenses over the bridge of the nose, and the temple length is the length of the arms that go over the ears. These measurements are usually found on the inside of one of the temple arms.
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Glasses that focus at three different distances are?
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What is a type of eyeglass?
There are many types of eye glasses like prescription eyeglasses, sunglasses, prescription sunglasses etc. For more information about eyeglasses and to purchase eyeglasses you can visit http://www.globaleyeglasses.com/
Glasses do what in our life?
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What kind of doctor do you need to get a prescription for eyeglasses?
You would need to see an optometrist to get a prescription for eyeglasses. Optometrists specialize in examining eyes for vision and health problems, as well as prescribing corrective lenses like eyeglasses.
Who discovered eye glasses?
Salvino D'Armate, an Italian inventor, is credited with inventing eyeglasses around the year 1286. He is believed to have developed the first wearable eyeglasses by placing lenses in a frame that could be held in front of the eyes.
What is the antonyms of eyeglasses?
what is the antonym for eyeglasses or glasses
Can you give me a sentence for eyeglasses?
James lost his eyeglasses.
Do eyeglasses have a patent on them?
Eyeglasses predate the patent system.
What is the plural of eyeglass?
The singular form 'eyeglasses' is a shortened form for 'a pair of eyeglasses'.The plural form is two pairs of eyeglasses, or simply 'eyeglasses'.
Is eyeglasses plural or singular?
Eyeglasses are plural. Each lens is an eyeglass.
Is eyeglasses a plural possessive noun?
The word 'eyeglasses' is a singular and plural noun; it is one of the nouns that are a singular word for 'a pair of', such as scissors, pants, etc. The singular, 'eyeglass' is the word for the lens in the eyeglasses. For example, 'I'm wearing my eyeglasses.' or 'I have two pair of eyeglasses.' The plural possessive is eyeglasses'. Example sentence: The eyeglasses' lenses need cleaning.
Is eyeglasses a compound word?
Yes. Eyeglasses is a compound word.
Where can you get Ozzy Osbourne glasses?
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How to pronounce Abbe as in Abbe refractometer?
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Who invented eyeglasses in the renaissance?
Salvino D'Aramto invented the eyeglasses in 1284.
Where can I purchase a new pair of designer eyeglasses?
The website ClearlyContacts offers cheap contacts and eyeglasses. Often there are promotions that provide the first pair of eyeglasses for free. Walmart also sells cheap eyeglasses.
How to get Eyeglasses with a fan connected to eyeglasses to keep you from getting hot?
There is no such invention of a fan that connects to eyeglasses. You could come up with a prototype and get it patented.
