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Health care
Of or pertaining to the prevention and treatment of illness, and the preservation of physical and mental well-being, through the services provided by medical professionals.
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Health care > Optometry 
focal power
Eyewear; Optometry
General term comprising the spherical and astigmatic vertex powers of a spectacle lens.
focusing telescopic device
Eyewear; Optometry
Device intended to be adjusted by the user for a range of object distances.
free working distance
Eyewear; Optometry
Distance between the most anterior portion of a telemicroscope and the object.
geometrical centre
Eyewear; Optometry
Intersection of the horizontal and vertical centrelines of the shape of the lens blank or uncut lens.
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