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In the US, spectacle lens prescriptions will generally follow the following format:
Right Lens Sphere Power - Right Lens Cylinder Value - Right Lens Cylinder Axis
Left Lens Sphere Power - Left Lens Cylinder Value - Left Lens Cylinder Axis
Reading Addition Power
Other information may also be included on the written prescription, but the necessary information listed above will always be included in the format indicated.
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What are some examples of surface defects in spectacle lenses?
* Cracks * Scratches * Peeling (if there is a coating on the lens)
What is the best way to clean spectacle lenses?
The best way to clean spectacle lenses is to use a specialized lens cleaner and a lint-free cloth. Spray the cleaner on the outside and inside of the lenses and gently rub dry with the cloth. Lens cleaners are available at most opticians, but be sure to check that they are suitable for your lens type. If you don't have any lens cleaner, use clean tap water and rub the lenses with your fingers. Dry with a soft tissue of lint-free cloth. Warning:Never use any kind of soap or detergent on anti-reflective coated lenses. The coatings will break down, and this will damage the lenses beyond repair.
What is spectacle lens?
A spectacle lens is a lens worn in front of the eye, mainly used to correctmyopia, hyperopia,astigmatism.
How do you spell the plural for lens?
The plural form of "lens" is "lenses."
Is spectacles made of glass?
Not all... Some spectacle-makers use plastic lenses instead of glass.
Which lens is used for projecting image on the screen?
Lenses for video projectors are normally designed and manufactured for each projector. Although some manuafacturers such as Sanyo, Barco and NEC make large projectors with interchangeable lenses, the lenses are still made for specific models. There is no standard for lens mounts as yet and it is unlikely that there will be a standard in the near future.
Is lenses the plural of lens?
Yes, "lenses" is the plural form of "lens." In optical terminology, a lens refers to a singular optical component, while lenses refers to multiple of these components.
How do you spell monicules?
This might be one, or the other, of these words: MOLECULES - smallest components of compounds, or groups of atoms of an element MONOCLES - spectacle lenses used for only one eye
What is the difference between high index and polycarbonate lenses?
High-index lenses are an alternative choice to standard, plastic eyeglass lenses. Although high-index lenses are more expensive than plastic lenses, they can reduce the thickness and weight of an eyeglass lens, particularly for individuals with a strong prescription. High-index lenses are able to bend light to a stronger degree than a lens with a lower index, therefore the higher the index of the lens the less material needed to achieve a given prescription. High index lenses are categorized according to how strongly they bend light. The higher the index, 1.53 to 1.74 for high-index lenses, the better the lens is at bending light. High index lenses are 20 percent to 65 percent thinner than standard plastic lenses. In general, the stronger the prescription, the greater the difference in thickness between standard plastic and high-index plastic. A reduction in lens thickness and weight will occur in high-index lenses for prescriptions stronger than +2.00 or -2.50. Weaker prescriptions are not thinner than standard lenses when made with high-index materials. Polycarbonate lenses offer the same aesthetic benefits as high-index lenses, but polycarbonate lenses scratch easier, are difficult to coat or tint and are more likely to create distortions in colors and vision.
What are two basic kinds of lenses?
Two basic kinds of lenses are the concave lens and the convex lens.
What is spectacles?
A spectacle lens is a lens worn in front of the eye, mainly used to correctmyopia, hyperopia,astigmatism.
What are the specifications for the Canon telephoto lens?
Canon telephoto lenses are a basic standard type of lens that magnifies the subject buy a certain percentage. Different lens are used in different settings- sunny, farther subjects, and in the snow.
