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 ?
These variations may be explained by the different diagnostic criteria used by different authors, racial or ethnic variations in the prevalence of refractive errors, different lifestyles or living conditions.
Effective methods of vision screening in school children are useful in detecting correctable causes of decreased vision, especially refractive errors and in minimising long-term visual disability.
Out of 900 students in 3 schools, 190 were known to be affected with refractive error; hence, the prevalence of known case of refractive error was 21%.
RE: Refractive error Table 2: Proportion of children with and without RE based on family history of RE Area Family history Refractive of RE status of child N (%) Refractive Normal error present Rural One parent 14 (15.
This can be attributed to the increasing incidence of refractive errors and better clinical outcomes due to technological advancements in ophthalmic lasers.
Sorsby and his colleagues used different age groups and sampling time frame, but importantly, refractive error was measured under cycloplegia and it was possible for us to access the raw results and apply the same definitions for myopia to Sorsby's data as we had used for our contemporary data.
Presence of astigmatism before operation and age did not affect postoperative refractive error.
Uncorrected refractive error was the leading cause of moderate to severe visual impairment, affecting an estimated 101.
Background: Refractive errors are one of the commonest causes of visual impairment and disability.
In this study, the fact that parents wore glasses before the 40 years of age was not associated with moderate hyperopia in their children, although a limitation was that parents' refractive error type was not defined precisely.
If the patient's visual acuity is reduced by refractive error, the pinhole acuity will be significantly better than the unaided acuity.
Myopia: Spherical equivalent of refractive error more than -0.