What Is Amblyopia?
Amblyopia was originally defined as poor vision, or blunt sight. The aspect of the deficit that is most commonly characterized is acuity, usually in the ophthalmologist’s office with a Snellen chart. However, the deficit as a whole is much more complicated than this. There may be a loss of connections or a distortion or rearrangement of connections within the visual cortex. What happens varies, according to the problem that caused the deficit, because the compensation in the central nervous system is specific to the optical or motor problem that has to be compensated. In some cases, as we shall see, there can even be a distortion of vision without any loss of acuity. Thus, amblyopia covers a variety of different forms of poor vision. As far as is currently possible, this chapter will describe the variations.
KeywordsReceptive Field Contrast Sensitivity Spatial Uncertainty Snellen Acuity Snellen Chart
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