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The OptiVISOR magnifier features replaceable binocular lenses that have beveled edges that are mounted in an interchangeable chintzy frame. An adjustable headband with padded leather reassure band conforms to a variety of head sizes and provides solace for hours of continuous use. It can be worn over prescription or safeness eyeglasses. A durable, plastic visor tips up above the forehead when not in use. Vault-loaded pivot screws hold the headband in a raised or a brazen-facing position. The magnifier weighs 0.67 lbs., and comes housed in a watchful shell and carrying case. It has a one-year minimal warranty.

Diopter (D) is a technical term for the size of the light curvature and thickness of a lens. A dioptric thousand and a magnification number are not the same thing. Diopter weight represents a specific magnification power (X). For illustration, a 5-diopter provides 2.5X magnification (at a aloofness of 8”). See the magnification chart. The higher the diopter, the more heightening a lens can provide. As magnification increases, interval to the object (focal length), and field of in consideration of (diameter, or narrowness of view) decreases. Magnifiers and medicine eyeglasses have a diopter value, such as 1.5 or 2. The dioptric soundness of an accessory lens, such as prescription eyeglasses or an eye loupe, must be added to the dioptric nerve of the magnifier to calculate total magnification.

Magnifiers are devices in use accustomed to to enlarge the visual appearance of an object or typical example. Magnifiers come in a variety of styles such as within arm's reach-held, headband, standing, clip-on, eye loupe, and those that persist in a necklace form, or fit in a trouser pocket. Magnifiers are commonly made of unformed or glass. They can have one or more lenses with varying magnification abilities, and can have a binocular configuration with a individual lens, or two separate lenses. They are sometimes used with LED or fluorescent light sources to pinch control viewing capabilities. Magnifier skill is often expressed as magnification at a specific length. For norm, 1.75X at 14” means that when a magnifier is held at 14” from a viewer’s eyes, the take a stand against will be magnified 1.75 times (X) its actual largeness. As magnification increases, viewing areas and focused length decrease. Magnifiers sometimes have a diopter number, expressed as + or -D, which is a amount of strength (or power) of the lens. Some magnifiers are signal with a dioptric number on the lens. A high diopter legions has a higher magnification than a low diopter number. Aspheric magnifiers, far from spheric magnifiers, produce a sharp perception to the edge of the lens for less distortion. Magnifiers are greatly used in jewelry inspection and fabrication, timepiece-making, needlework, artwork, reading, print inspection, and document-collecting.

Determining Magnification

Diopter	Enlargement	Focal length (Distance from object)	Bite view
20/20 vision		20" (50.8cm)
2-diopter lens	1.50X	20" (50.8cm)
3-diopter lens	1.75X	14" (35.56cm)
4-diopter lens	2.00X	10" (25.4cm)
5-diopter lens	2.50X	8" (20.32cm)
7-diopter lens	2.75X	6" (15.24cm)
10-diopter lens	3.50X	4" (10.16cm)