Which ultrasound technique can help differentiate between cystic and solid lesions in the eye?

B-scan ultrasonography is the correct technique for differentiating between cystic and solid lesions in the eye. This technique allows for the visualization of the internal architecture of ocular structures by providing a two-dimensional cross-sectional image. It is particularly useful in evaluating the nature of ocular masses because it can effectively demonstrate the presence of internal echoes that indicate solid tissue and can also show acoustic enhancement, a characteristic of cystic lesions.

In contrast, A-scan ultrasonography primarily provides one-dimensional data, which is not adequate for visualizing spatial relationships or internal structures of lesions. Power Doppler and Color Doppler ultrasound are focused on assessing blood flow within tissues rather than characterizing the nature of masses. Although they can provide important information about vascularity, they do not provide the same level of detail in distinguishing between solid and cystic formations as B-scan does.