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Opthalmic Optics
Test 1.4 Anisometropia/Anisekonia
11
Other
Not Applicable
10/06/2007

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Cards

Term
How much do the refractive errors in each eye have to be to consider the patient as having anisometropia?
Definition
1.00 D or more
Term
How much is the accomodative response in antimetropia?
Definition
The accomodative response is no greater than the amount of accomodation required by the myopic eye including the lag of accomodation due to Hering's law of equal innervation. The hyperopic eye will not accomodate enough.
Term
How many prism diopters of vertical imbalance are generated for 1 D of anisometropia?
Definition
1 prism diopter
Term
How much vertical imbalance can a patient tolerate without causing asthenopia?
Definition
1 prism diopter
Term
Which group has the biggest magnification uncorrected axial, myopes, hyperopes, or emmetropes?
Definition
myopes>emmetropes>hyperopes
Term
Which group has the biggest magnification, uncorrected refractive myopes, emmetropes or hyperopes?
Definition
Refractive error doesn't create an image size difference.
Term
According to Knapp's law, which type of myopia or hyperopia would best be corrected by spectacle lenses?
Definition
axial, Yet in practice while the image size may be corrected on the retina, it is not corrected cortically.
Term
Which type of aniseikonia indicates a progressive increase in image size in one meridian or in all directions between the two eyes?
Definition
Asymmetrical aniseikonia
Term
What determines the factor by which the initial size is magnified or minified?
Definition
Spectacle magnification
Term
What law says, "When a correcting lense is placed before the eye such that its second principle plane conincides with the anterior focal point of an axially ametropic eye, the size of the retinal image will be the same as though the eye were emmetropic."
Definition
Knapp's law
Term
For a patient with normal binocular vision, an image size difference of greater than what percent is rarely found?
Definition
5 percent
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