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Related to focal distance: Effective focal length
the distance from the center of a lens to its focus.
fo·cal dis·tance(fō'kăl dis'tăns)
The distance from the center of a lens to its focus.
In ophthalmology, the distance from the optical center of a lens to the focal point.
See also: distance
1. limited to a small area or volume.
2. pertaining to or emanating from focus.
see focal-film distance.
the distance between the lens and an object from which all rays of light are brought to a focus.
focal liver disease
widely disseminated micro-abscesses or abscesses, migration paths of helminth larvae.
focal macular melanosis
dark colored spots on the skin, not elevated above the skin surface but apt to be confused with melanosis.
widely disseminated inflammatory lesions, usually the result of blood-borne infection, in brain and spinal cord.
focal symmetrical encephalomalacia
see focal symmetrical encephalomalacia.
focal symmetrical spinal poliomalacia
see focal symmetrical spinal poliomalacia.
focal ulcerative dermatitis
manifest by ulcers in the unfeathered anterior breast skin of 4 to 5 months old male turkeys. The incidence is influenced by litter type. Called also breast buttons.
in ultrasound, the area of the transducer where the sound beam is most sharply focussed and where the area under examination will give the best image.