higher order aberration


Also found in: Dictionary, Thesaurus, Legal, Encyclopedia.

higher order aberration

In ophthalmology, a refractive error that cannot be corrected by bending light into the eye with eyeglasses or contact lenses.
See also: aberration
References in periodicals archive ?
Third order to 6th order aberrations showed a decreasing trend whereas in the higher order aberrations the main ones were 3rd order coma (Z(3) (-1)-Z(3)(1)), trefoil (Z(3)(-3)-Z(3)(3)) and 4th order aberration (Z(4)(0)); and 3rd order coma represented the highest percentage of all three main aberrations.
In 2010 Jan, Plech AR et al, (4) (Vissum/Instituto Oftalmologico de Alicante, Universidad de Alicante, Alicante--Spain) investigated the amount, type, and role of corneal higher order aberrations in both isotropic and Anisometropic amblyopic adult patients.
KEY WORDS: Coma, Spherical Aberration, Higher order aberrations, LASIK.
Higher order aberrations (spherical aberrations, coma, trefoil) are small optical irregularities of the ocular refractive media.
Important higher order aberrations include coma, trefoil and spherical aberrations and they are measured by root mean square (RMS) value which represents the ocular aberrations in micrometers.
Some authors have concluded HOAs to be more in ametropia than emmetropic eyes9 while others proposed no relationship or even an opposite relationship between refractive error and HOAs8,12,22 and still others reporting greater higher order aberrations in myopes compared to hyperopes.23
Intraindividual comparison of functional vision and higher order aberrations after implantation of aspheric and spherical intraocular lenses.
Alio, "Wavefront analysis of higher order aberrations in dry eye patients," Journal of Refractive Surgery, vol.
The DNEye registers lower and higher order aberrations of the eye for near and far vision, as well as the brightness-dependent changes of the pupils.
She added that this is particularly the case for subjects with impaired optical quality relating to an increase in intraocular light scatter and/ or increased higher order aberrations.
He highlighted the changes in higher order aberrations with pupil size and showed how such changes can affect the manifest refraction and visual performance.
Furthermore, there is great interest in the benefit of correcting such aberrations in order to enhance visual quality; indeed, correction of higher order aberrations has been of prime interest in corneal refractive surgery techniques.
Full browser ?