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

Diopter (D) is a technical appellation for the measurement of the light curvature and thickness of a lens. A dioptric number and a magnification mob are not the same thing. Diopter strength represents a specific magnification power (X). For prototype, a 5-diopter provides 2.5X magnification (at a distance of 8”). See the magnification chart. The higher the diopter, the more glorification a lens can provide. As magnification increases, distance to the object (focal length), and scope of view (diameter, or narrowness of view) decreases. Magnifiers and prescription eyeglasses have a diopter value, such as 1.5 or 2. The dioptric toughness of an accessory lens, such as prescription eyeglasses or an eye loupe, must be added to the dioptric strength of the magnifier to count total magnification.

Magnifiers are devices used to enlarge the visual appearance of an tangible or image. Magnifiers come in a variety of styles such as hand-held, headband, unbroken, clip-on, eye loupe, and those that hang in a necklace form, or fit in a trouser pocket. Magnifiers are equally made of plastic or glass. They can have one or more lenses with varying magnification abilities, and can have a binocular configuration with a single lens, or two unrelated lenses. They are sometimes used with LED or fluorescent light sources to help control viewing capabilities. Magnifier capability faculty is often expressed as magnification at a specific length. For example, 1.75X at 14” means that when a magnifier is held at 14” from a viewer’s eyes, the against will be magnified 1.75 times (X) its actual size. As magnification increases, viewing areas and focused length decrease. Magnifiers sometimes have a diopter number, expressed as + or -D, which is a measurement of strength (or power) of the lens. Some magnifiers are apparent with a dioptric number on the lens. A high diopter number has a higher magnification than a low diopter mass. Aspheric magnifiers, unlike spheric magnifiers, produce a sharp image to the tense of the lens for less distortion. Magnifiers are widely used in jewelry inspection and fabrication, eye-making, needlework, artwork, reading, print inspection, and stamp-collecting.

Determining Enhancement

Diopter	Magnification	Focal length (Distance from object)	Sample view
20/20 perspective		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)