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etimología

Qué (quién) es variant readings - definición

DIAGNOSTIC INSTRUMENT FOR MEASURING THE CURVATURE OF THE ANTERIOR SURFACE OF THE CORNEA

Ophthalmometer; Keratometry; Keratometer readings; K-readings

Variant (biology)

SUBTYPE OF A MICROORGANISM

Variant (virus)

In microbiology and virology, the term variant or genetic variant is used to describe a subtype of a microorganism that is genetically distinct from a main strain, but not sufficiently different to be termed a distinct strain. A similar distinction is made in botany between different cultivated varieties of a species of plant, termed cultivars.

https://en.wikipedia.org/wiki/Variant_(biology)

vCJD

DEGENERATIVE BRAIN DISEASE CAUSED BY PRIONS

VCJD; Variant Creutzfeldt-Jakob Disease; Variant CJD; NvCJD; NVCJD; Variant CJD UK; Variant Creutzfeld-Jakob disease; Human mad cow disease; Variant Creutzfeldt-Jakob disease; New variant Creutzfeldt-Jakob disease; New variant Creutzfeldt–Jakob disease

¦ abbreviation new variant Creutzfeld-Jakob disease.

Variant Creutzfeldt–Jakob disease

DEGENERATIVE BRAIN DISEASE CAUSED BY PRIONS

VCJD; Variant Creutzfeldt-Jakob Disease; Variant CJD; NvCJD; NVCJD; Variant CJD UK; Variant Creutzfeld-Jakob disease; Human mad cow disease; Variant Creutzfeldt-Jakob disease; New variant Creutzfeldt-Jakob disease; New variant Creutzfeldt–Jakob disease

Variant Creutzfeldt–Jakob disease (vCJD), commonly referred to as "mad cow disease", is a type of brain disease within the transmissible spongiform encephalopathy family. Initial symptoms include psychiatric problems, behavioral changes, and painful sensations.

https://en.wikipedia.org/wiki/Variant_Creutzfeldt–Jakob_disease

Wikipedia

Keratometer

A keratometer, also known as an ophthalmometer, is a diagnostic instrument for measuring the curvature of the anterior surface of the cornea, particularly for assessing the extent and axis of astigmatism. It was invented by the German physiologist Hermann von Helmholtz in 1851, although an earlier model was developed in 1796 by Jesse Ramsden and Everard Home.

A keratometer uses the relationship between object size (O), image size (I), the distance between the reflective surface and the object (d), and the radius of the reflective surface (R). If three of these variables are known (or fixed), the fourth can be calculated using the formula

R=2d{\frac {I}{O}}

There are two distinct variants of determining R; Javal-Schiotz type keratometers have a fixed image size and are typically 'two position', whereas Bausch and Lomb type keratometers have a fixed object size and are usually 'one position'.

https://en.wikipedia.org/wiki/Keratometer