Loss of vision without any apparent disease of the eye.
A condition in which the refractive error of one eye significantly differs from that of the other.
A sub‐classification of anisometropia, is a rare refractive condition in which one eye is myopic and the fellow eye is hyperopic
The seeing of one object as two, due to uneven tracking of the eyes. Commonly known as double vision.
Gradual lessening of the power of accommodation due to a physiologic change that becomes noticeable about the age of 35.
When an eye is emmetropic, light rays coming into the eye from a distance come to perfect focus on the retina. When a person has emmetropia in both eyes, the person is described as having ideal vision.
A condition in which the image of an object as seen by one eye
differs so much
in size or shape from that seen by the other eye that the two images cannot be
fused into a single impression.
Distortion of an optical image produced by the dispersion of light passing through a lens and generally characterized by blurred, multicolored edges.
A tendency for the eye to deviate from its visual axis or the normal.
A tendency for one eye to deviate off the visual axis toward the other eye.
A tendency for one eye to deviate off the visual axis away from the other eye.
An obvious actual deviation from normal of the axis of the eyes.
Actual deviation of one eye toward the visual axis of the other eye (crossed eyes).
Actual deviation of one eye away from the visual axis of the other eye (wall eyed).
Simple Hyperopic Astigmatism
The refractive condition where one point of focus falls on the retina and the other point of focus falls behind the retina.
Example: plano +1.50 x 180.
Simple Myopic Astigmatism
The refractive condition where one point of focus falls on the retina and the other point of focus falls in front of the retina.
Example: plano -2.00 x 180
Compound Hyperopic Astigmatism
The refractive error which results in two points of focus falling behind the retina.
Example: +1.00 +2.00 x 090
Compound Myopic Astigmatism
The refractive error which results in two points of focus falling in front of the retina.
Example: -1.00 -2.00 x 090
The refractive condition in which light comes to two points of focus where one point is in front of the retina, and the other is behind the retina.
Example: +1.00 -2.00 x 180
Bifocal are used to correct for a condition called:
An RX with the O.D. minus and the O.S. plus is an obvious case of:
RX O.D. -4.50 -1.00 x 180, O.S. -2.50 -1.00 x 45, This prescription indicates an obvious case of:
A patient with a hyperopic prescription always has the following kind of power:
An ophthalmic correction for a patient with amblyopia is to focus parallel incident light rays at the:
Far point of the eye
A patient with a myopic prescription always the following kind of power:
The condition of vision due to diminished accommodative amplitude which moves the near point further from the eye than is convenient for reading is known as:
Trifocals are most generally prescribed when the patient has:
Who is the best potential candidate for progressive power lenses?
A patient with early presbyopia