Farsightedness is a refractive error in which the image
does not come to focus before striking the retina in the
relaxed eye. Accommodation may be used to overcome
small amounts of hyperopia.
Involving the use of a single eye.
Nearsightedness is a refractive error in which the point
of focus for light rays is in front of the retina, resulting in
blurred distant vision.
Obscuring the vision of one eye to test the vision or force
the use of the other eye.
Parallelism of visual axes, the normal eye muscle
balance.
Additional software features that can be installed directly
on 2WIN.
When referred to human eye, this term, or the term
Refractometry, are used to indicate the measurement of
the Refractive Error, that is the error in the focusing of
light by the eye.
Equivalent to ametropia, it is usually decomposed into a
spherical error and a cylindrical error. Types of
ametropia include myopia, hyperopia and astigmatism.
Occurs when the optical power of the eye is either too
large or too small to focus light on the retina.
Failure of the two eyes to direct their gaze at the same
object because of inappropriate neuromuscular control
or because of fibrosis or paralysis of one or more
extraocular muscles, as in crossed eyes or walleyes.
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