Which ocular structure is represented between A-scan spikes A and B?

The structure represented between A-scan spikes A and B is the lens. In an A-scan ultrasonography, each spike corresponds to a different ocular interface between tissue and fluid, reflecting sound waves. The first spike (A) typically represents the front surface of the cornea, while the subsequent spike (B) corresponds to the back surface of the lens. The lens is a crucial component of the eye, responsible for focusing light onto the retina. The spikes are utilized for measurements relevant to cataract surgery and other lens-related evaluations, making it essential to identify the lens accurately in this context.

The other structures listed provide different reflections in an A-scan but do not correspond to the area in question. For instance, the cornea is represented by the first spike, while the retina would show up much later in the A-scan as it is located deeper within the eye. The vitreous body, although present within the eye, does not produce a distinct wave reflection in the same manner as the lens or cornea when using an A-scan. Thus, confirming that the lens lies between the A and B spikes is critical for accurate ocular assessments and surgical planning.