Emmetropia
Emmetropia (from Greek emmetros, "well-proportioned" or "fitting") describes the state of vision where an object at infinity is in sharp focus with the eye lens in a neutral or relaxed state. This condition of the normal eye is achieved when the refractive power of the cornea and the axial length of the eye balance out, which focuses rays exactly on the retina, resulting in perfect vision. An eye in a state of emmetropia requires no correction.
Emmetropia is a state in which the eye is relaxed and focused on an object more than 6 meters or 20 feet away. The light rays coming from that object are essentially parallel, and the rays are focused on the retina without effort (an emmetropic eye does not need corrective lenses). If the gaze shifts to something closer, light rays from the source are too divergent to be focused without effort. In other words, the eye is automatically focused on things in the distance unless a conscious effort is made to focus elsewhere. For a wild animal or human prehistorical ancestors, this arrangement would be adaptive because it allows for alertness to predators or prey at a distance.
Accommodation of the lens does not occur in emmetropia. In emmetropia, the lens is about 3.6 mm thick at the center; in accommodation, it thickens to about 4.5 mm. A relatively thin lens and relatively dilated pupil are also associated. The lens usually stiffens with age, causing less ability to focus when the eyes are not in a state of emmetropia.[1]
Corrective eye surgery such as LASIK and PRK aims to correct anemmetropic vision. This is accomplished by ensuring the curvature of the cornea, the shape of the lens and their distances from each other and the retina are in harmony. By shaping the cornea, emmetropic vision can be achieved without corrective lenses. The correction for only emmetropic vision is often why patients are still advised to wear glasses to read as they age due to presbyopia.[2]
Newborns begin hypermetropic and then undergo a myopic shift to become emmetropic.[citation needed]
Emmetropization
The development of an eye towards emmetropia is known as emmetropization. This process is guided by visual input, and the mechanisms that coordinate this process are not fully understood.[3] It is assumed that emmetropization occurs via an active mechanism by which defocus drives growth of the eye[4] and that genetic factors and emmetropization both influence the growth of the eye's axis.[5]
It has long been assumed that wearing corrective spectacles might possibly perturb the process of emmetropization in young children, with this assumption being supported in particular also by animal studies. For this reason, a refractive undercorrection is sometimes held to be advantageous in specific cases.[6] However, it is not yet fully understood for which patient groups, if any, the wearing of corrective spectacles in childhood actually impedes emmetropization.[7] In hyperopic children, yet more factors are to be considered: Hypertropia is known to be a significant risk factor for esotropia, therefore undercorrection may have the side effect of increasing this risk.[8] There is widespread consensus that undercorrection is counterindicated for children with accommodative esotropia.[6] It is still unclear for which hyperopic, non-strabismic children corrective spectacles may translate to a lower strabismus risk.[7][4] There are indications that emmetropization is relevant for hyperopic children who have at most about 3.0 diopter, whereas children with stronger hyperopia seem to not change their refraction independently of whether the refractive error is corrected or not.[9]
A Cochrane Review of three trials seeking to determine whether spectacle correction reduced the occurrence of strabismus in children[10] included one study which suggested that spectacle correction perturbed emmetropization in children,[11] while a second study reported no differences.[12]
Etymology
"Emmetropia" is ultimately derived from Greek en/em ("in") + metron ("measure," not to be confused with metr-/meter "mother") + op[s/t]- ("eye") + -ia ("condition"). Translated literally, the term indicates the condition of an eye's having in itself (i.e., without recourse to corrective lenses or other instruments) the capability to obtain an accurate measurement of an object's physical appearance.
References
- ↑ Saladin, Kenneth S. "16." Anatomy & Physiology: the Unity of Form and Function. New York, NY: McGraw-Hill, 2012. Print.
- ↑ [1]
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- ↑ "Children with a greater degree of hyperopia are at a greater erisk to become esotropic; thus, a dilemma exists in presribig convex lenses to prevent the deviation as opposed to a possible interference with the emmetropization process." Quoted from: Lua error in package.lua at line 80: module 'strict' not found.
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Further reference:
- Bernard Gilmartin, 1998. Myopia and nearwork Pg 33-34, Elsevier Health Sciences. ISBN 0-7506-3784-6
