axial length of the eye

length of the eye, axial

The distance between the anterior and posterior poles of the eye. In vivo, it is measured either by ultrasonography or by partial coherence interferometry (PCI). These measurements represent the distance between the anterior pole and Bruch's membrane. (In young eyes in which there is a refractive index difference at the retina-vitreous interface ultrasonography measures the distance between the anterior pole and the anterior surface of the retina.) The axial length of the eye at birth is approximately 17 mm and reaches approximately 24 mm in adulthood. It is typically longer than 24 mm in myopes and shorter than 24 mm in hyperopes. Each mm of change in axial length of the eye corresponds to approximately 2.5 D See biometry of the eye; ultrasonography.
References in periodicals archive ?
Regarding choice of IOL power calculating formula, the Royal College of Ophthalmologists' recommended IOL calculation formulae depending on the axial length of the eye.
An Icare[R] rebound tonometer (TA01, TIOLAT Oy, Finland) was used to measure intraocular pressure (IOP); compound tropicamide eye drops (SANTEN OY, Tampere, Finland) were applied to dilate the pupil; a direct ophthalmoscope was used to observe the vertical cup-to-disc ratio (C/D) and the posterior pole of both eyes; for the glaucoma suspect patients, especially the infant patients, a fundus photograph would be obtained by Retcam (Clarity Medical Systems, Pleasanton, CA, USA) for C/D observation, a flashlight was used to examine the cornea, a Type A ultrasound test was used to evaluate the axial length of the eye, and gonioscopy would be applied to glaucoma suspect patients.
Sherpa D, Badhu BP Association between axial length of the eye and primary angle closure glaucoma Kathmandu University Medical Journal (2008), Vol.
Concluding the current findings, the development of degenerative lesions in the ocular fundus is associated both with the elongation of the axial length of the eye, and with worsening of blood flow.
Biometry requires measurement of the axial length of the eye and the corneal curvature together with an appropriate computer formula to predict IOL power.