optic density

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• density — 1. The compactness of a substance; the ratio of mass to unit volume, usually expressed as g/cm3 (kg/m3 in the SI system). 2. The quantity of electricity on a given surface or in a given time per unit of volume. 3. In radiological p …   Medical dictionary

• Fiber-optic communication — An optical fiber junction box. The yellow cables are single mode fibers; the orange and blue cables are multi mode fibers: 50/125 µm OM2 and 50/125 µm OM3 fibers respectively. Fiber optic communication is a method of transmitting information from …   Wikipedia

• absorbance — In spectrophotometry, log of the ratio of the radiant power of the incident radiation to the radiant power of the transmitted radiation. SYN: absorbancy, absorbency, extinction (2), o …   Medical dictionary

• aggregometer — An instrument for measuring platelet aggregation by monitoring over time the changes in optic density of a platelet suspension treated with aggregating agents such as ADP, collagen, epinephrine, etc. * * * ag·gre·gom·e·ter (ag″r …   Medical dictionary

• OD — Abbreviation for overdose; optic density (see absorbance). * * * Doctor of Optometry; object dictionary; obtained absorbance; occipital dysplasia; occupational dermatitis; occupational disease; oculodynamic; Ollier disease; on duty; once a day;… …   Medical dictionary

• zones of discontinuity — zones of varying optic density, seen with the slit lamp, in the lens of the eye; these zones are formed at particular periods in the prenatal development of the lens …   Medical dictionary

• eye, human — ▪ anatomy Introduction  specialized sense organ capable of receiving visual images, which are then carried to the brain. Anatomy of the visual apparatus Structures auxiliary to the eye The orbit       The eye is protected from mechanical injury… …   Universalium

• endocrine system, human — ▪ anatomy Introduction  group of ductless glands (gland) that regulate body processes by secreting chemical substances called hormones (hormone). Hormones act on nearby tissues or are carried in the bloodstream to act on specific target organs… …   Universalium

• Optical fiber connector — An optical fiber connector terminates the end of an optical fiber, and enables quicker connection and disconnection than splicing. The connectors mechanically couple and align the cores of fibers so that light can pass. Better connectors lose… …   Wikipedia

• Fiber to the x — (FTTX) is a generic term for any network architecture that uses optical fiber to replace all or part of the usual copper local loop used for telecommunications. The four technologies, in order of an increasingly longer fiber loop are:* Fiber to… …   Wikipedia

• Retina — For the Retina display in the iPhone 4, see iPhone 4#Display. Retina Right human eye cross sectional view. Courtesy NIH National Eye Institute. Many animals hav …   Wikipedia