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 ?
1) Although any level of myopia has the potential to precipitate degeneration, (2) those with refractive errors over 6.
The students were checked up for refractive errors and managed on spot it said adding that their hepatitis and AIDs screening tests were also conducted.
There's also surgery for refractive errors, such as lasik (when the cornea is re-shaped by a laser).
Also, it had stated that uncorrected refractive errors have led to visual impairments especially in the low and middle income economies.
London, February 11( ANI ): Scientists have discovered 24 new genes that cause refractive errors and myopia (short-sightedness).
This growth is mainly driven by increasing number of population suffering from refractive errors and rising awareness and cost effectiveness of eye care devices over refractive surgeries.
Ocular morbid conditions are cataract, refractive errors, Xerophthalmia, Pterygium, strabismus, dacryocystitis, etc; are some of them.
Although the impact of uncorrected refractive errors on academic achievement in children has not yet been indisputably established, it is likely that the "education gap" can at least in part be related to under-treatment of clinically significant refractive errors.
Buratto, a specialist in cataract and myopia surgery, leads a team of contributing ophthalmologists to describe the current treatment techniques of the eye's surface used in the laser correction of refractive errors Photorefractive keratectomy (PRK) has perhaps evolved less than LASIK and other laser vision correction techniques, he says, but information on the eye's healing response, pharmacology, therapy, and biomechanics have greatly improved.
The appendix contains supplemental information on surgical techniques for the correction of refractive errors as well as an extensive glossary of terms.
Management, prevention or cure of refractive errors