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The type of lenses used in eyeglasses depends on the type of vision problem, and may include: Concave lenses . These are thinnest in the center. The numerical prescription in diopters is always marked with a minus (-) symbol. These lenses are used to correct nearsightedness (myopia). Convex lenses .
Popular lenses and their appropriate uses include: Aspheric lenses. With a complex front surface that gradually curves from the center of the lens out to the edge, these lenses provide corrections for small vision distortions. Bifocal lenses. ... Trifocal lenses. ... Progressive lenses. ... High-index lenses. ... Photochromic lenses. ... Polarized lenses. ... Polycarbonate lenses. ...
Type takes on a shape, often a simple rectangle on websites, when body copy is added to the page. The intensity of the shape can depend on the size of the font, the font face and how you lay out the text. In the magazine layout below the two columns of body copy are fully justified and also wrap around the circular ampersand symbol in the headline.
For a bolt-type anchor, the nominal diameter of the drilled hole equals that of the anchor bolt. For a sleeve-type anchor, the nominal diameter of the drilled hole equals that of the sleeve encasing the bolt. MASON wedge anchor is the most common bolt-type anchor.
Type “C” Safety Clamp is one of the most valuable tools on the Rig Floor. It helps guard against dropping flush-joint pipe, streamlined drill collars, etc. into the hole while making-up or breaking-out the string. Type “T” Safety Clamp is designed for small diameter pipe 1 1/8” - 4 1/2” O.D.