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A C79 Optical Sight. The C79 optical sight (SpecterOS3.4x) is a telescopic sight manufactured by Elcan. A variant, the M145 Machine Gun Optic is in use by the US military. It is 3.4×28, meaning 3.4x magnification, and a 28mm diameter objective lens. A tritium illuminated reticle provides for normal and low-light conditions sighting. [1]
With tangent sights, the rear sight is often used to adjust the elevation, and the front the windage. The M16A2 later M16 series rifles have a dial adjustable range calibrated rear sight, and use an elevation adjustable front sight to "zero" the rifle at a given range. The rear sight is used for windage adjustment and to change the zero range.
When refractive errors in children are not treated, the child may be at risk of developing ambylopia, where vision may remain permanently blurry. [33] Because young children typically do not complain of blurry vision, the American Academy of Pediatrics recommends that children have yearly vision screening starting at three years old so that unknown refractive errors or other ophthalmic ...
Many tube sights offer the option of interchangeable filters (such as polarizing or haze-reducing filters), glare-reducing sunshades, and conveniently protective "flip-up" lens covers. Open sights (also known as "mini reflex sights" and "mini red dots") take advantage of the fact that the reflector sight's only optical element, the optical ...
Disassociation is the loss of data, objects, or association between objects [13] It can occur when documentation is lost, objects or their parts are damaged or removed and lost. With historic firearms, disassociation can happen when the weapon is disassembled for cleaning or the firing pins are removed to deter theft or accidental firing.
Sight restoration restores function to those who have visual impairments. Depending on the cause of the impairment, it can include: Cataract surgery: Restoring vision by removing an eye lens that has become opaque; Corneal transplantation: Replacing a damaged or diseased cornea with a donor cornea, a form of organ transplantation
scope (equipment) – A sight housing that resembles a scope, containing one or more pins used to align the bow with the target. Some housings, mainly used in target archery and often sold separately from the rest of the sight, can accept lenses (see clarifier). self bow (equipment) – A bow made from a single piece of material (normally wood)
Cataracts: Cloudiness over the eye's lens, cause blurring of vision, halos around lights, and sensitivity to glare. [5] It is also the main cause of blindness worldwide. [2] Glaucoma: Increased intraocular pressure (pressure in the eye) cause progressive optic neuropathy that leads to optic nerve damage, visual field defects and blindness. [6]
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