What does the Tyndall effect highlight during an optical diagnostic procedure?

The Tyndall effect specifically demonstrates the scattering of light by particles that are dispersed in a solution or suspension. During an optical diagnostic procedure, the presence of particles—such as proteins or cellular debris—within the ocular media can cause light to scatter, making those particles visible. This is particularly useful in ophthalmology to identify conditions like uveitis or inflammation where there may be an increase in suspended particles in the aqueous humor.

In contrast, blood vessels may not be directly highlighted by this effect since they are not typically suspended particles but are rather structured tissues with their own optical properties. Surface irregularities refer to the outside structure of the cornea or lens and do not utilize the principle of light scattering to indicate their presence. Changes in refractive index can affect how light passes through different mediums but the Tyndall effect specifically relates to particles that scatter light rather than differences in how light is refracted. Thus, the Tyndall effect is pivotal in visualizing particles in suspension, making option B the appropriate choice.