Which condition is described as anisometropia?

Anisometropia is defined as a condition where there is a significant difference in refractive errors between the two eyes. This means that one eye may require a different prescription for correction compared to the other eye, which can lead to issues such as double vision or problems with depth perception if the difference is substantial. Understanding this condition is important in optometry and ophthalmology, as it can influence a patient's vision and comfort level with corrective lenses.

The other options do not accurately define anisometropia. Equal refractive errors in both eyes would indicate that the eyes share the same visual correction needs, which is the opposite of anisometropia. The inability to focus images on the retina relates more to issues such as amblyopia or other focusing problems, rather than a specific disparity in refractive error. Finally, the presence of a false lens in the eye does not pertain to refractive differences but rather to specific conditions involving the lens itself, such as cataracts. Thus, the characteristic of having significant refractive errors differing between the eyes is what precisely defines anisometropia.