correcting lenses
21Catadioptric system — A 150 mm aperture catadioptric telescope (Maksutov) A catadioptric optical system is one where refraction and reflection are combined in an optical system, usually via lenses (dioptrics) and curved mirrors (catoptrics). Catadioptric… …
22Paintball equipment — is central to paintball, given its equipment intensive nature. Although good equipment by no means guarantees a good player, a good player s ability can be seriously hampered by poor quality equipment. In order to safely conduct a game of… …
23Coma (optics) — v · d · e Optical aberration …
24telescope — /tel euh skohp /, n., adj., v., telescoped, telescoping. n. 1. an optical instrument for making distant objects appear larger and therefore nearer. One of the two principal forms (refracting telescope) consists essentially of an objective lens… …
25Presbyopia — is a condition where the eye exhibits a progressively diminished ability to focus on near objects with age. Presbyopia’s exact mechanisms are not known with certainty; the research evidence most strongly supports a loss of elasticity of the… …
26Transformation optics — Electromagnetism Electricity · …
27LASIK — or Lasik ( laser assisted in situ keratomileusis ) is a type of refractive laser eye surgery performed by ophthalmologists for correcting myopia, hyperopia, and astigmatism. [ [http://www.intelihealth.com/IH/ihtIH/WSS/9339/32123.html LASIK. ]… …
28Rangefinder camera — A Foca camera of 1947 at the Musée des Arts et Métiers in Paris. A rangefinder camera is a camera fitted with a rangefinder: a range finding focusing mechanism allowing the photographer to measure the subject distance and take photographs that… …
29Diving mask — A diving mask showing the retaining strap A diving mask is an item of diving equipment that allows scuba divers, free divers, and snorkelers to see clearly underwater.[1] When the human eye is in direct contact with w …
30Religious and physiological views of near-death experiences — There are many viewpoints about near death experiences from religious and physiological standpoints.Religious perspectiveThe NDE is often cited as evidence for the existence of the human soul and the afterlife, an idea that occurs in several… …
