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Knapp's law is in reference to anisometropes (people who have refractive errors >1D between the two eyes).
It states that if a patient an axial anisometrope (difference is due to a difference in length of the eye) than it is better to correct them with spectacles (with a vertex distance of about 17mm) to give them the same image size on their retina.
If the patient is a refractive anisometrope (difference due to refractive power of the cornea/lens) than it is better to correct them with contact lenses.
This is all based on the fact that uncorrect axial anisometropes will have unequal image sizes on their retina (aniseikonia) and the difference in power of the glasses actually help counteract that. However refractive anisometropes have no aniseikonia, nor do contact lenses induce it.
Source: Myself, 2 years of optometry school.
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