Certified Diagnostic Ophthalmic Sonographer (CDOS) Practice exam

A high reflectivity of the vitreous on ultrasound often indicates the presence of abnormal structures or conditions within the vitreous body. In the case of vitreous detachment, the reflectivity can increase due to the separation of the vitreous from the retina and the associated changes in echogenicity.

During a vitreous detachment, the areas where the vitreous is pulling away can display altered echogenic properties due to the movement of the collagen fibers and other components within the vitreous gel. This results in a more reflective appearance on an ultrasound image, which is a key diagnostic indicator of this condition.

In contrast, other ocular conditions listed do not directly correlate with an increased reflectivity of the vitreous on ultrasound. Cataract formation occurs within the lens and would not affect the reflectivity of the vitreous itself. Choroidal neovascularization involves abnormal blood vessel growth beneath the retina and primarily impacts the retinal structures rather than the vitreous body, while retinal artery occlusion pertains to blood flow issues within the retina, which again would not lead to changes in vitreous reflectivity. Thus, the correct association of high reflectivity with vitreous detachment establishes the rationale for this answer.