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59 relations: Ambient pressure, Atmosphere of Earth, Barotrauma, Blue, Chromatic aberration, Color, Condensation, Contact lens, Cornea, Corrective lens, Dioptre, Dive computer, Diving equipment, Diving helmet, Diving mask, Ear clearing, Ellipse, Far-sightedness, Focus (optics), Freediving, Full face diving mask, Glass, Goggles, Hockey puck, Human eye, Ice hockey, Lens (anatomy), Lens (optics), Light, Linguistics, Liquid-crystal display, List of light sources, Near-sightedness, Oceanic Worldwide, Optical filter, Polycarbonate, Ray (optics), Recreational diver training, Red, Refraction, Refractive index, Retina, Saliva, Scuba diving, Scuba skills, Seal (mechanical), Silicone, Snorkeling, Standard diving dress, Sunlight, ..., Surface-supplied diving, Synthetic rubber, Toughened glass, Underwater, Underwater diving, Underwater hockey, Underwater vision, Valsalva maneuver, Visible spectrum. Expand index (9 more) »
Ambient pressure
The ambient pressure on an object is the pressure of the surrounding medium, such as a gas or liquid, in contact with the object.
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Atmosphere of Earth
The atmosphere of Earth is the layer of gases, commonly known as air, that surrounds the planet Earth and is retained by Earth's gravity.
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Barotrauma
Barotrauma is physical damage to body tissues caused by a difference in pressure between a gas space inside, or in contact with the body, and the surrounding gas or fluid.
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Blue
Blue is one of the three primary colours of pigments in painting and traditional colour theory, as well as in the RGB colour model.
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Chromatic aberration
In optics, chromatic aberration (abbreviated CA; also called chromatic distortion and spherochromatism) is an effect resulting from dispersion in which there is a failure of a lens to focus all colors to the same convergence point.
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Color
Color (American English) or colour (Commonwealth English) is the characteristic of human visual perception described through color categories, with names such as red, orange, yellow, green, blue, or purple.
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Condensation
Condensation is the change of the physical state of matter from gas phase into liquid phase, and is the reverse of vapourisation.
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Contact lens
A contact lens, or simply contact, is a thin lens placed directly on the surface of the eye.
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Cornea
The cornea is the transparent front part of the eye that covers the iris, pupil, and anterior chamber.
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Corrective lens
A corrective lens is a lens typically worn in front of the eye to improve vision.
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Dioptre
A dioptre (British spelling) or diopter (American spelling) is a unit of measurement of the optical power of a lens or curved mirror, which is equal to the reciprocal of the focal length measured in metres.
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Dive computer
A dive computer, personal decompression computer or decompression meter is a device used by an underwater diver to measure the time and depth of a dive so that a safe ascent profile can be calculated and displayed so that the diver can avoid decompression sickness.
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Diving equipment
Diving equipment is equipment used by underwater divers to make diving activities possible, easier, safer and/or more comfortable.
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Diving helmet
A Diving helmet is a rigid head enclosure with a breathing gas supply used in underwater diving.
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Diving mask
A diving mask (also half mask, dive mask or scuba mask) is an item of diving equipment that allows underwater divers, including, scuba divers, free-divers, and snorkelers to see clearly underwater.
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Ear clearing
Ear clearing or clearing the ears or equalization is any of various maneuvers to equalize the pressure in the middle ear with the outside pressure, by letting air enter along the Eustachian tubes, as this does not always happen automatically when the pressure in the middle ear is lower than the outside pressure.
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Ellipse
In mathematics, an ellipse is a curve in a plane surrounding two focal points such that the sum of the distances to the two focal points is constant for every point on the curve.
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Far-sightedness
Far-sightedness, also known as hyperopia, is a condition of the eye in which light is focused behind, instead of on, the retina.
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Focus (optics)
In geometrical optics, a focus, also called an image point, is the point where light rays originating from a point on the object converge.
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Freediving
Freediving, free-diving, free diving, breath-hold diving, or skin diving is a form of underwater diving that relies on breath-holding until resurfacing rather than the use of breathing apparatus such as scuba gear.
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Full face diving mask
A full-face diving mask is a type of diving mask that seals the whole of the diver's face from the water and contains a mouthpiece, demand valve or constant flow gas supply that provides the diver with breathing gas.
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Glass
Glass is a non-crystalline amorphous solid that is often transparent and has widespread practical, technological, and decorative usage in, for example, window panes, tableware, and optoelectronics.
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Goggles
Goggles, or safety glasses, are forms of protective eyewear that usually enclose or protect the area surrounding the eye in order to prevent particulates, water or chemicals from striking the eyes.
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Hockey puck
A hockey puck is a disk made of vulcanized rubber that serves the same functions in various games as a ball does in ball games.
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Human eye
The human eye is an organ which reacts to light and pressure.
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Ice hockey
Ice hockey is a contact team sport played on ice, usually in a rink, in which two teams of skaters use their sticks to shoot a vulcanized rubber puck into their opponent's net to score points.
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Lens (anatomy)
The lens is a transparent, biconvex structure in the eye that, along with the cornea, helps to refract light to be focused on the retina.
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Lens (optics)
A lens is a transmissive optical device that focuses or disperses a light beam by means of refraction.
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Light
Light is electromagnetic radiation within a certain portion of the electromagnetic spectrum.
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Linguistics
Linguistics is the scientific study of language, and involves an analysis of language form, language meaning, and language in context.
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Liquid-crystal display
A liquid-crystal display (LCD) is a flat-panel display or other electronically modulated optical device that uses the light-modulating properties of liquid crystals.
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List of light sources
This is a list of sources of light, including both natural and artificial processes that emit light.
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Near-sightedness
Near-sightedness, also known as short-sightedness and myopia, is a condition of the eye where light focuses in front of, instead of on, the retina.
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Oceanic Worldwide
Oceanic is an American manufacturer of scuba gear.
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Optical filter
An optical filter is a device that selectively transmits light of different wavelengths, usually implemented as a glass plane or plastic device in the optical path, which are either dyed in the bulk or have interference coatings.
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Polycarbonate
Polycarbonates (PC) are a group of thermoplastic polymers containing carbonate groups in their chemical structures.
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Ray (optics)
In optics a ray is an idealized model of light, obtained by choosing a line that is perpendicular to the wavefronts of the actual light, and that points in the direction of energy flow.
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Recreational diver training
Recreational diver training is the process of developing knowledge and understanding of the basic principles, and the skills and procedures for the use of scuba equipment so that the diver is able to dive for recreational purposes with acceptable risk using the type of equipment and in similar conditions to those experienced during training.
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Red
Red is the color at the end of the visible spectrum of light, next to orange and opposite violet.
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Refraction
Refraction is the change in direction of wave propagation due to a change in its transmission medium.
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Refractive index
In optics, the refractive index or index of refraction of a material is a dimensionless number that describes how light propagates through that medium.
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Retina
The retina is the innermost, light-sensitive "coat", or layer, of shell tissue of the eye of most vertebrates and some molluscs.
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Saliva
Saliva is a watery substance formed in the mouths of animals, secreted by the salivary glands.
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Scuba diving
Scuba diving is a mode of underwater diving where the diver uses a self-contained underwater breathing apparatus (scuba) which is completely independent of surface supply, to breathe underwater.
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Scuba skills
Scuba skills are the skills required to dive safely using self-contained underwater breathing apparatus, (scuba).
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Seal (mechanical)
A mechanical seal is a device that helps join systems or mechanisms together by preventing leakage (e.g. in a plumbing system), containing pressure, or excluding contamination.
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Silicone
Silicones, also known as polysiloxanes, are polymers that include any inert, synthetic compound made up of repeating units of siloxane, which is a chain of alternating silicon atoms and oxygen atoms, combined with carbon, hydrogen, and sometimes other elements.
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Snorkeling
Snorkeling (British and Commonwealth English spelling: snorkelling) is the practice of swimming on or through a body of water while equipped with a diving mask, a shaped breathing tube called a snorkel, and usually swimfins.
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Standard diving dress
Standard diving dress (also known as hard-hat or copper hat equipment, or heavy gear) is a type of diving suit that was formerly used for all underwater work that required more than breath-hold duration, which included marine salvage, civil engineering, pearl shell diving and other commercial diving work, and similar naval diving applications.
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Sunlight
Sunlight is a portion of the electromagnetic radiation given off by the Sun, in particular infrared, visible, and ultraviolet light.
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Surface-supplied diving
Surface-supplied diving is diving using equipment supplied with breathing gas using a diver's umbilical from the surface, either from the shore or from a diving support vessel, sometimes indirectly via a diving bell.
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Synthetic rubber
A synthetic rubber is any artificial elastomer.
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Toughened glass
Toughened or tempered glass is a type of safety glass processed by controlled thermal or chemical treatments to increase its strength compared with normal glass.
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Underwater
Underwater refers to the region below the surface of water where the water exists in a natural feature (called a body of water) such as an ocean, sea, lake, pond, or river.
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Underwater diving
Underwater diving, as a human activity, is the practice of descending below the water's surface to interact with the environment.
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Underwater hockey
Underwater Hockey (UWH), also known as Octopush (mainly in the United Kingdom) is a globally played limited-contact sport in which two teams compete to manoeuvre a puck across the bottom of a swimming pool into the opposing team's goal by propelling it with a hockey stick (pusher).
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Underwater vision
Underwater, things are less visible because of lower levels of natural illumination caused by rapid attenuation of light with distance passed through the water.
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Valsalva maneuver
The Valsalva maneuver or Valsalva manoeuvre is performed by moderately forceful attempted exhalation against a closed airway, usually done by closing one's mouth, pinching one's nose shut while pressing out as if blowing up a balloon.
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Visible spectrum
The visible spectrum is the portion of the electromagnetic spectrum that is visible to the human eye.
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References
[1] https://en.wikipedia.org/wiki/Diving_mask
