- meridian of cornea
- an imaginary line marking the intersection with its surface of an anteroposterior plane passing through the apex of the cornea.
Medical dictionary. 2011.
Medical dictionary. 2011.
meridian — 1. [TA] A line encircling a globular body at right angles to its equator and touching both poles, or the half of such a circle extending from pole to pole. SYN: meridianus [TA]. 2. In acupuncture, the lines connecting different anatomical sites.… … Medical dictionary
eye, human — ▪ anatomy Introduction specialized sense organ capable of receiving visual images, which are then carried to the brain. Anatomy of the visual apparatus Structures auxiliary to the eye The orbit The eye is protected from mechanical injury… … Universalium
Astigmatism — A common form of visual impairment in which part of an image is blurred, due to an irregularity in the curvature of the front surface of the eye, the cornea. The curve of the cornea is shaped more like an American football or a rugby ball rather… … Medical dictionary
Astigmatism (eye) — DiseaseDisorder infobox Name = Astigmatism ICD10 = ICD10|H|52|2|h|49 ICD9 = ICD9|367.2 Astigmatism is an optical defect, whereby vision is blurred due to the inability of the optics of the eye to focus a point object into a sharp focused image on … Wikipedia
Lens — The transparent structure inside the eye that focuses light rays onto the retina (the nerve layer that lines the back of the eye, senses light and creates impulses that go through the optic nerve to the brain). The lens was named after the lentil … Medical dictionary
Refractive error — Refraction error Classification and external resources ICD 10 H52.0 H52.4 ICD 9 … Wikipedia
Eyeglass prescription — Using a phoropter to determine a prescription for eyeglasses An eyeglass prescription is an order written by an eyewear prescriber, such as an optometrist or ophthalmologist, that specifies the value of all parameters the prescriber has deemed… … Wikipedia
Keratotomy — A surgical incision (a cut) made into the cornea. A radial keratotomy is a surgical procedure designed to flatten the cornea, reduce its optical power, and correct nearsightedness (myopia). The procedure is called a radial keratotomy because the… … Medical dictionary
Corrective lens — A bifocal corrective eyeglass lens A pair of contact le … Wikipedia
Astigmatism — An optical system with astigmatism is one where rays that propagate in two perpendicular planes have different foci. If an optical system with astigmatism is used to form an image of a cross, the vertical and horizontal lines will be in sharp… … Wikipedia