Ametropia is a general term used to refer
to any abnormality of refraction in the eye.
This may be experienced as blurred vision.
Compare and contrast:
- In cases of normal vision, light enters the eye
then passes through the cornea
(which refracts light), then the aqueous
humour, then the pupil,
then the lens
(that further refracts the light, focussing it into an image on the
retina).
This situation is called "emmetropia".
.
- In cases of ametropia, the overall process does
not refract (that is, "bend" or "re-direct") light
from the object being viewed to exactly the ideal extent necessary to
form a clear sharp image on the retina at the back of the eye.
While ametropia is a general term for abnormal
refraction through the eye, there are also many specific terms describing
particular ways in which refraction through the eye is abnormal, including:
More about Ophthalmology: This section includes short definitions
of many diseases, disorders, and conditions of the eyes and visual system.
For definitions of other terms in this category, choose from the list
to the left (but note that this is not a complete/exhaustive list).
Other related pages include the diagram
of the eye, and definitions
of parts of the eye, a description
of the human retina, and definitions
of parts of the retina, and the section of short definitions
of clinical and surgical procedures re. eyes and human visual system.
For further information see also our section of Books
about Ophthalmology. |
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This Section
is about
Diseases
and Disorders of the Eyes and Visual System.
To read about other diseases, disorders, or conditions of the eye and
human visual system, use the links on the left-side of this page.
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