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Photorefractive keratectomy (PRK) and laser-assisted sub-epithelial keratectomy (or laser epithelial keratomileusis [1]) (LASEK) are laser eye surgery procedures intended to correct a person's vision, reducing dependency on glasses or contact lenses.
Photorefractive keratectomy (PRK) is an outpatient procedure generally performed with local anesthetic eye drops (as with LASIK/LASEK). It is a type of refractive surgery which reshapes the cornea by removing microscopic amounts of tissue from the corneal stroma, using a computer-controlled beam of light ( excimer laser ).
Cartridge: 7.62×39mm M43: Action: Gas-operated, rotating bolt; closed bolt: Rate of fire: 600 rounds/min: Muzzle velocity: 745 m/s (2,444 ft/s) Effective firing range: 100–1,000 m sight adjustments, Windage adjustable at the rear sight
The PKP Pecheneg (Pulemyot Kalashnikova Pekhotny "Pecheneg", Russian: Печенег) [8] [9] is a Russian 7.62×54mmR general-purpose machine gun. [4] It is a further development and modification of the PK machine gun (PKM). [10]
The PK feed mechanism is radically different from that of 7.62×51mm NATO machine guns based on the MG 42 feed mechanism that typically incorporate a much larger (and therefore much heavier) articulated feed cam, lever, and pawl assembly that pushes rimless cartridges out forward from their links directly into the chamber for firing.
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PRK can refer to: North Korea's ISO 3166-1 alpha-3 code; Photorefractive keratectomy, laser eye surgery; Phase reversal keying, a form of phase-shift keying; People's Republic of Korea, short-lived 1945 government; People's Republic of Kampuchea, 1979-1989; Port Kent (Amtrak station), New York, US station code; Phosphoribulokinase, an enzyme
The typical cost is between $2,000 and $14,000 per billable hour to charter a private jet. However, those prices aren’t the whole story. However, those prices aren’t the whole story.
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