refractive error

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refractive error

[rifrak′tiv]
a defect in the ability of the lens of the eye to focus an image accurately, as occurs in nearsightedness and farsightedness.

refractive error

Ametropia, myopic shift Ophthalmology The inability of images to focus properly on the retina, often corrected by glasses contact lenses, or refractive surgery. See Astigmatism, Farsightedness, Myopia, Presbyopia.

refractive error 

The dioptric power (K) of the ametropia of the eye. It is equal to 1/k in dioptres, where k is the distance between the far point and either the spectacle plane (spectacle refraction), or the principal point of the eye, or the refracting surface of the reduced eye (ocular refraction), in metres. Thus
K = 1/k
when the eye is situated in air. Syn. ametropia (although this is not strictly so as ametropia is the anomaly); refraction of the eye; refractive status; static refraction. See far point of accommodation; Scheiner's experiment.

refractive

capacity to refract light.

refractive error
a difference between the focal length of the cornea and lens, and the length of the eye, resulting in myopia or hyperopia.
refractive media
of the eye include the vitreous humor and the lens.
References in periodicals archive ?
The refraction error is manifested directly in the height error of individual benchmarks;
In the levelling loops that involve symmetrical slopes, the refraction error will not be expressed as an error in levelling loop closure.
The models for refraction error calculation originate from the common basis, which is expressed as the effect of the temperature gradient on the refractive index of air and the assumption that the isothermal layers are parallel to the ground (Kakkuri 1984).
Relationship between HOAs and age and between high- order aberrations and refraction errors.
The first GPS-based measurements, which avoid the refraction errors that plague theodolite-based surveys, were taken by Italian geodesists in 1989.
Unrecognized significant refraction errors were found in 34% of subjects.
A two-line or more improvement in visual acuity defined significant refraction errors.
After correction of the refraction errors, near and distance deviation angles were measured with an accomodation target by either prism cover test or Krimsky test according to patient compliance and were recorded as PD.
7,9) As in all strabismus cases, preoperatively correcting refraction errors, treating amblyopia and establishing alternation are also important in infantile esotropia patients.