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{adj: anisometropic} relating to a difference in the refractive power of the two eyes

{adj: deflective, refractive} capable of changing the direction (of a light or sound wave)

{adj: refractive, refractile} of or relating to or capable of refraction
"the refractive characteristics of the eye"

{n: anisometropia} difference in the refractive power of the two eyes

{n: diopter, dioptre} a unit of measurement of the refractive power of a lens which is equal to the reciprocal of the focal length measured in meters; used by oculists

{n: emmetropia} (ophthalmology) the normal refractive condition of the eye in which there is clear focus of light on the retina

{n: isometropia} equality of refractive power in the two eyes

{n: lead glass} glass containing lead oxide; has a high refractive index

{n: myopia, nearsightedness, shortsightedness} (ophthalmology) eyesight abnormality resulting from the eye's faulty refractive ability; distant objects appear blurred
<-> hyperopia

{n: optical crown, crown glass, optical crown glass} optical glass of low dispersion and low refractive index

{n: optical flint, flint glass} optical glass of high dispersion and high refractive index

{n: optical glass} clear homogeneous glass of known refractive index; used to make lenses

{n: refractive index, index of refraction} the ratio of the velocity of light in a vacuum to that in a medium

{n: refractometer} measuring instrument for measuring the refractive index of a substance

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